CN119574423A - Instrument and method for accurately testing viscoelasticity parameters of optical glass material - Google Patents
Instrument and method for accurately testing viscoelasticity parameters of optical glass material Download PDFInfo
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Abstract
本发明涉及材料粘弹性测试技术领域，本发明提供了一种精准测试光学玻璃材料粘弹性参数的仪器以及方法。本发明包括：机架；工作腔包括密闭腔体、设于密闭腔体四周的加热件、样品支架以及力传感器；样品支架以及力传感器均设在密闭腔体中；力模块包括升降支架，电磁感应器，下压块以及压力顶杆；下压块平行设置于升降支架上设置有电磁感应器的一侧；升降支架能够上下升降带动压力顶杆与样品接触，电磁感应器通电后能够为下压块以及压力顶杆提供向下的阶跃力；位移检测组件包括用于监测样品受力后轴向变形的位移传感器。本发明可以实现理想的阶跃力，满足更理想的蠕变测试载荷条件；保证理想粘弹性蠕变数据的获得，提高测试的准确性。
The present invention relates to the technical field of material viscoelasticity testing, and the present invention provides an instrument and method for accurately testing the viscoelastic parameters of optical glass materials. The present invention includes: a frame; a working chamber including a closed cavity, a heating element arranged around the closed cavity, a sample holder and a force sensor; the sample holder and the force sensor are both arranged in the closed cavity; a force module including a lifting bracket, an electromagnetic inductor, a lower pressure block and a pressure push rod; the lower pressure block is arranged parallel to the side of the lifting bracket where the electromagnetic inductor is arranged; the lifting bracket can be lifted up and down to drive the pressure push rod to contact the sample, and the electromagnetic inductor can provide a downward step force to the lower pressure block and the pressure push rod after being energized; the displacement detection component includes a displacement sensor for monitoring the axial deformation of the sample after being subjected to force. The present invention can achieve an ideal step force and meet more ideal creep test load conditions; ensure the acquisition of ideal viscoelastic creep data and improve the accuracy of the test.
Description
Technical Field
The invention relates to the technical field of material viscoelasticity test, in particular to an instrument and a method for accurately testing viscoelasticity parameters of an optical glass material at high temperature.
Background
The viscoelastic parameters (e.g., shear relaxation modulus) of optical glass materials at high temperatures are key physical quantities for studying and predicting the flowability and stress relaxation behavior of glass during precision molding.
However, the servo press equipment employed in conventional viscoelastic testing methods does not provide the desired step load, resulting in inaccurate measured glass viscoelastic creep data. In addition, in conventional testing, glass specimens have been increasingly cross-sectional under high load pressure and have been laterally expanded into a drum shape under interfacial friction interference, further resulting in distortion of the viscoelastic creep data.
Accordingly, there is a need to provide a new apparatus and method for obtaining glass viscoelastic parameters accurately.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to overcome the prior art.
In order to solve the above technical problems, in one aspect, the present invention provides an apparatus for accurately testing the viscoelastic parameters of an optical glass material, comprising:
a frame comprising an upright;
The working cavity comprises a closed cavity arranged at one side of the upright post, a heating piece arranged at the periphery of the closed cavity, a sample support and a force sensor, wherein the sample support and the force sensor are arranged in the closed cavity, and the force sensor is arranged at the bottom of the sample support;
The force module comprises a first driving piece, a lifting bracket, an electromagnetic sensor, a lower pressing block and a pressure ejector rod, wherein the lifting bracket is connected to the upright post in a sliding way, the electromagnetic sensor is arranged on the lifting bracket, the lower pressing block and the pressure ejector rod are arranged at the bottom of the lower pressing block, and the lower pressing block and the outer end of the lifting bracket form a revolute pair; the lifting bracket can lift up and down to drive the pressure ejector rod to contact with the sample, and the electromagnetic sensor can provide downward step force for the lower pressing block and the pressure ejector rod after being electrified;
The displacement detection assembly comprises a displacement sensor arranged at the top of the lower pressing block, and the displacement sensor is used for monitoring axial deformation of the sample after being stressed.
In one embodiment of the application, the application further comprises a control assembly electrically connected to the heating element, the force sensor, the electromagnetic sensor and the first driving element.
In one embodiment of the invention, the frame further comprises a base fixedly connected to the bottom of the upright post and a top plate fixedly connected to the top of the upright post, and the working cavity is arranged on the base.
In one embodiment of the invention, the displacement sensor comprises a detection body connected with the frame and a sensor connecting rod arranged at the bottom of the detection body, the displacement detection assembly further comprises a cover body arranged at the top of the top plate, and the sensor connecting rod penetrates through the first through hole of the top plate and then is connected with the lower pressing block.
In one embodiment of the invention, the working cavity further comprises a guide piece and a cover plate, the heating piece is connected to the outer wall of the guide piece in an up-down sliding mode, the heating piece, the cover plate and the guide piece are enclosed to form a closed cavity after rising, the cover plate is connected to one side of the upright post, the cover plate is provided with a second through hole, and the pressure ejector rod penetrates through the second through hole and stretches into the closed cavity.
In one embodiment of the invention, the working chamber further comprises a lifting cylinder body, the telescopic end of the lifting cylinder body is connected with the heating element, and the lifting cylinder body stretches to drive the heating element to lift.
In one embodiment of the invention, the working chamber further comprises a guide rail arranged on the outer wall of the guide member and a sliding block matched with the guide rail, and the sliding block is connected to the inner wall of the heating member.
In one embodiment of the invention, the heating element is an infrared heating tube.
In one embodiment of the invention, the sample holder is made of quartz glass.
In one embodiment of the invention, a sliding block is arranged at one end of the lifting support, which is connected with the upright post, the sliding block is sleeved on the upright post, the sliding block is connected with a first driving piece, and the first driving piece drives the sliding block to lift up and down along the upright post.
In another aspect, the present invention provides a method for precisely testing the viscoelastic parameters of an optical glass material, wherein the following steps are performed by using any one of the above embodiments:
The electromagnetic sensor is electrified to provide downward step force for the lower pressing block, the step force is applied to the sample to deform the sample, meanwhile, the force sensor monitors the value of the step force applied to the sample, and the displacement sensor monitors the axial deformation of the sample after being stressed.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
The instrument and the method for accurately testing the viscoelasticity parameters of the optical glass material can realize ideal step force and meet more ideal creep test load conditions. In the test process, only axial creep deformation of several micrometers to tens of micrometers occurs, the side surface does not generate obvious drum shape, and therefore constant pressure can be ensured, interference of friction force can be weakened, the acquisition of ideal viscoelasticity creep data is ensured, and the test accuracy is improved.
Drawings
In order that the invention may be more readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings, in which:
FIG. 1 is a schematic structural diagram of an apparatus for precisely testing the viscoelasticity parameters of an optical glass material according to a preferred embodiment of the present invention;
FIG. 2 is a schematic diagram of the structure of the optical glass material of FIG. 1 in a state of being tested by an instrument for precisely testing the viscoelasticity parameters of the optical glass material;
FIG. 3 is a schematic diagram of the electromagnetic inductor for a downward step force load F of the lower press block;
FIG. 4 is a flow chart of a test performed using an instrument for accurately testing the viscoelastic parameters of an optical glass material as shown in FIG. 1;
FIG. 5 illustrates a conventional axial creep test and a minor axial creep test;
FIG. 6 is an axial creep displacement simulated cloud at each temperature (where FIG. 6 (a) is an axial creep displacement simulated cloud at 550 ℃ and FIG. 6 (b) is an axial creep displacement simulated cloud at 600 ℃);
Fig. 7 is a comparison of the results of numerical simulation at different temperatures with the actual measurement results (wherein fig. 7 (a) is a comparison of the results of numerical simulation at 550 ℃ with the actual measurement results, and fig. 7 (b) is a comparison of the results of numerical simulation at 600 ℃ with the actual measurement results).
The reference numerals of the specification are 100, a frame, 110, a column, 120, a base, 130 and a top plate;
200. working cavity 210, closed cavity 220, heating element 230, sample support 240, force sensor 250, guide element 260, cover plate;
300. a displacement detection assembly; 310, a displacement sensor, 311, a detection body, 312, a sensor connecting rod, 320 and a cover body;
400. Force module 410, lifting bracket 420, electromagnetic inductor 430, lower pressing block 440, pressure ejector rod 450, elastic rod 460, sliding block;
500. a sample;
600. a gasket.
Detailed Description
The invention will be further described in connection with the accompanying drawings and specific examples which are set forth so that those skilled in the art will better understand the invention and will be able to practice it, but the examples are not intended to be limiting of the invention.
The viscoelastic properties of glass over a forming temperature range, such as shear relaxation modulus, are key physical quantities that predict the fluidity and stress relaxation behavior of glass during molding. However, it is difficult to obtain high-precision glass viscoelasticity data by the conventional large axial creep test method because the cross-sectional area of the test specimen is increased and the lateral surface expands into a drum shape under the interface friction interference during the test, thereby causing creep data distortion. In addition, existing calculation methods have limitations in terms of the conversion of axial creep data into viscoelastic shear relaxation modulus, and especially in cases where the glass poisson ratio is unknown at high temperatures, this results in failure to calculate the viscoelastic properties. Therefore, in this embodiment, an optical glass is taken as a specific research object, and a viscoelastic testing method based on micro axial creep is provided to accurately obtain viscoelastic data of the glass, which specifically includes micro axial creep test, short-term modulus test, viscoelastic characterization calculation and finite element analysis verification.
In view of the above problems, referring to fig. 1 to 7, an embodiment of the present invention provides an apparatus and a method for accurately testing the viscoelastic parameters of an optical glass material, where the apparatus for accurately testing the viscoelastic parameters of the optical glass material includes a frame 100, a working chamber 200, a displacement detection assembly 300, and a force module 400. The stand 100 comprises a stand 110, the working cavity 200 comprises a closed cavity 210 arranged on one side of the stand 110, a heating element 220 arranged on the periphery of the closed cavity 210, a sample support 230 and a force sensor 240, wherein the sample support 230 and the force sensor 240 are arranged in the closed cavity 210, the force sensor 240 is arranged at the bottom of the sample support 230 so as to measure contact force, and pressure born by a sample 500 during working can be transmitted to the force sensor 240 through the sample support 230. Thus ensuring that the sample 500 does not deform under initial test conditions, and enabling the real-time detection of the amount of pressure applied to the sample 500 by the force module 400 during testing. The force module 400 includes a first driving member, a lifting bracket 410 slidably connected to the upright post 110, an electromagnetic sensor 420 disposed on the lifting bracket 410, a lower pressing block 430 forming a revolute pair with the outer end of the lifting bracket 410, and a pressure ejector rod 440 disposed at the bottom of the lower pressing block 430. In some embodiments, the lower press block 430 is connected to the outer end of the lifting bracket 410 through an elastic rod 450, one end of the elastic rod 450 is connected to the outer end of the lifting bracket 410, and the other end of the elastic rod 450 is connected to one end of the lower press block 430, which is far from the pressure ejector rod 440. In other embodiments, the outer end of the lifting bracket 410 is hinged to the end of the lower press block 430 remote from the pressure ram 440. The lower pressing block 430 is arranged in parallel on one side of the lifting bracket 410, where the electromagnetic inductor 420 is arranged, the lifting bracket 410 can lift up and down to drive the pressure ejector rod 440 to be in contact with and fixed with the sample 500, the electromagnetic inductor 420 can provide downward step force for the lower pressing block 430 and the pressure ejector rod 440 after being electrified, the electromagnetic inductor 420 can generate ideal step force, the precision of the step force load is ensured, and the sample 500 does not generate a drum shape.
The displacement detection assembly 300 includes a displacement sensor 310 disposed on top of the lower press block 430, the displacement sensor 310 being configured to monitor axial deformation of the sample 500 after being subjected to a force.
The apparatus of the above embodiment is used to perform the steps of lowering the lifting frame 410 until the pressure ram 440 contacts the upper surface of the sample 500, energizing the electromagnetic sensor 420 to provide a downward step force to the lower press block 430, the step force being applied to the sample 500 to deform the sample 500, and simultaneously monitoring the magnitude of the step force applied to the sample 500 by the force sensor 240 and monitoring the axial deformation of the sample 500 after the force is applied by the displacement sensor 310. See fig. 4 for a specific test operation flow.
Test case one
In the test example, the viscoelasticity test is carried out on the cylindrical Borofloat-33 optical glass at 550 ℃ by the instrument and the method, and the viscoelasticity shear relaxation modulus of the optical glass with the model is obtainedIs a data of (a) a data of (b). In the test process, the glass sample 500 is heated to 550 ℃ and then subjected to heat preservation for 10 minutes to ensure uniform temperature distribution of the sample, then the sensor connection rod 312 applies a 1N step load to the sample, the heat preservation and the axial creep data of the glass sample 500 are recorded through the LVDT displacement sensor 310, and the axial creep data of the glass sample are converted into viscoelastic shear relaxation modulus of the glass through the following solving process, so as to complete calculation of the glass viscoelasticity data.
First, the axial creep compliance obtained by the generalized Kelvin model pair testFitting:
(1)
In the formula (1), t is time; is the short term young's modulus at a particular temperature; And Generalized Kelvin model numbersModulus of elasticity and relaxation time of individual units; the viscosity of the viscous pot unit in series with the kelvin model is shown.
Laplacian transformation is carried out on the formula (1) to obtain:
(2)
In formula (2), s is an argument of the laplace domain; is the short term young's modulus at a particular temperature; And Generalized Kelvin model numbersModulus of elasticity and relaxation time of individual units; the viscosity of the viscous pot unit in series with the kelvin model is shown.
Further, the shear relaxation modulus in the Laplace domainCan be calculated by the formula (3):
(3)
In the formula (3), Is the shear relaxation modulusS is an independent variable of the Laplace domain; is the short term young's modulus at a particular temperature; And Generalized Kelvin model numbersModulus of elasticity and relaxation time of individual units; the viscosity of the viscous pot unit in series with the kelvin model is shown.
Shear relaxation modulus to complex domain in equation (3)Inverse Laplace transform to obtain time-domain shear relaxation modulusData and fitting the shear relaxation modulus of the time domain using a four-element generalized Maxwell modelAnd the data of each component of the viscoelastic shear relaxation modulus of the glass material at 550 ℃ are obtained as follows:
(4)
in the formula (4), t is time; Is generalized Maxwell model No The relaxation time of the individual branches is such that,,From the firstShear modulus of Maxwell Wei ShanyuanAnd (d)Viscosity of Max Wei ShanyuanAnd (5) jointly determining.
The method comprises the steps of establishing a numerical simulation model of a test process, namely an axisymmetric finite element simulation model, inputting viscoelastic shear relaxation modulus component data of a glass material obtained by the test and calculation method at 550 ℃ into the simulation model, calculating and simulating to obtain axial creep displacement (unit mm) of the model, finding that a creep displacement cloud image is uniformly layered distribution as shown in fig. 6 (a), avoiding non-uniform axial creep displacement distribution caused by the occurrence of a lateral drum shape in the traditional axial creep simulation, indicating that the method can realize ideal axial creep, extracting simulation results, comparing the simulation results with experimental results, and enabling a simulation creep curve and an experimental creep curve to be highly matched and have the maximum deviation within 0.1%, wherein the method can be further used as a high-precision viscoelastic test method as shown in fig. 7 (a).
In this test example, a cylindrical Borofloat-33 optical glass was tested for viscoelasticity at 600℃by the apparatus and method described. In the test process, the glass sample 500 is heated to 600 ℃ and then subjected to heat preservation for 10 minutes to ensure uniform temperature distribution of the sample, then the sensor connection rod 312 applies a 1N step load to the sample, the heat preservation and the axial creep data of the glass sample 500 are recorded through the LVDT displacement sensor 310, and the axial creep data of the glass sample are converted into viscoelastic shear relaxation modulus of the glass through the following solving process, so as to complete calculation of the glass viscoelasticity data.
Axial creep compliance obtained by generalized Kelvin model pair testingFitting:
(5)
In the formula (5), t is time; is the short term young's modulus at a particular temperature; And Generalized Kelvin model numbersModulus of elasticity and relaxation time of individual units; the viscosity of the viscous pot unit in series with the kelvin model is shown.
Laplacian transformation is carried out on the formula (5) to obtain:
(6)
In formula (6), s is an argument of the laplace domain; is the short term young's modulus at a particular temperature; And Generalized Kelvin model numbersModulus of elasticity and relaxation time of individual units; the viscosity of the viscous pot unit in series with the kelvin model is shown.
Further, shear relaxation modulus in complex domainCan be calculated by the formula (6):
(7)
in the formula (7) of the present invention, Is the shear relaxation modulusS is an independent variable of the Laplace domain; is the short term young's modulus at a particular temperature; And Generalized Kelvin model numbersModulus of elasticity and relaxation time of individual units; the viscosity of the viscous pot unit in series with the kelvin model is shown.
Shear relaxation modulus for complex domains in equation (7)Inverse Laplace transform to obtain time-domain shear relaxation modulusData and fitting the shear relaxation modulus of the time domain using a four-element generalized Maxwell modelAnd the data of each component of the viscoelastic shear relaxation modulus of the glass material at 600 ℃ are obtained as follows:
(8)
In the formula (8), t is time; Is generalized Maxwell model No The relaxation time of the individual branches is such that,,From the firstShear modulus of Maxwell Wei ShanyuanAnd (d)Viscosity of Max Wei ShanyuanAnd (5) jointly determining.
The method comprises the steps of establishing a numerical simulation model of a test process, namely an axisymmetric finite element simulation model, inputting viscoelastic shear relaxation modulus component data of a glass material obtained by the test and calculation method into the simulation model, calculating and simulating to obtain axial creep displacement (unit mm) of the model, finding that a creep displacement cloud image is uniformly layered distribution as shown in fig. 6 (b), avoiding non-uniform axial creep displacement distribution caused by the occurrence of a lateral drum shape in the traditional axial creep simulation, describing that the method can realize ideal axial creep, extracting simulation results, comparing the simulation results with experimental results, wherein a simulation creep curve and an experimental creep curve are highly matched, and the maximum deviation is within 0.1%, and further describing that the method can be used as a high-precision viscoelastic test method as shown in fig. 7 (b).
Specifically, the embodiment can realize ideal step force and meet more ideal creep test load conditions. In the test process, only axial creep deformation of several micrometers to tens of micrometers occurs, the side surface does not generate obvious drum shape, and therefore constant pressure can be ensured, interference of friction force can be weakened, the acquisition of ideal viscoelasticity creep data is ensured, and the test accuracy is improved.
Further, the present application further includes a control component electrically connected to the heating element 220, the force sensor 240, the electromagnetic sensor 420, and the first driving element. The control assembly may control the rate of temperature rise of the heating chamber by controlling the current to the heating element 220.
Specifically, under the initial test condition, the control component controls the first driving member to open to drive the lifting bracket 410 to descend so that the pressure ejector rod 440 contacts with the sample 500, and meanwhile, the force sensor 240 can monitor the pressure applied to the sample 500 by the force module 400 and feed back to the control component, so that the sample 500 is ensured not to deform under the initial test condition. During testing, the control assembly controls the electromagnetic sensor 420 to turn on the application of pressure to the sample 500, while the force sensor 240 is capable of monitoring the pressure applied to the sample 500 by the force module 400 and feeding back to the control assembly, thereby monitoring the value of the pressure applied to the sample 500 by the force module 400 in real time. The displacement of the sample 500 can be detected by the displacement sensor 310 during deformation of the sample 500 and this information is transferred to the control assembly. It can be seen that the present embodiment can further realize accurate testing and automation.
Further, the frame 100 further includes a base 120 fixedly connected to the bottom of the upright post 110, and a top plate 130 fixedly connected to the top of the upright post 110, and the working chamber 200 is disposed on the base 120. In particular, the structure of the rack 100 of the present embodiment is more stable and reliable.
Further, the displacement sensor 310 employs an LVDT displacement sensor 310. Specifically, the LVDT displacement sensor 310 has a small volume and a light weight, and can accurately measure the deformation of the sample 500, thereby realizing nanoscale high-precision deformation measurement.
Further, the displacement sensor 310 comprises a detecting body 311 connected with the top plate 130 of the frame 100 and a sensor connecting rod 312 arranged at the bottom of the detecting body 311, the displacement detecting assembly 300 further comprises a cover 320, the cover 320 is arranged at the top of the top plate 130, the detecting body 311 is arranged in the cover 320, the top plate 130 is provided with a first through hole, and the sensor connecting rod 312 passes through the first through hole of the top plate 130 and then is connected with the pressing block 430. Specifically, since the displacement sensor 310 needs to implement nanoscale high-precision deformation measurement, the detection body 311 and a part of the sensor connecting rod 312 are arranged in the cover 320, so that the influence of external environmental factors on the precision of the displacement sensor 310 is avoided, and the accuracy of the test is further ensured.
Further, the working chamber 200 further includes a guide member 250 and a cover plate 260, the heating member 220 is connected to the outer wall of the guide member 250 in a vertically sliding manner, the heating member 220, after ascending, encloses the cover plate 260 and the guide member 250 to form a closed chamber 210, the cover plate 260 is connected to one side of the upright post 110, the cover plate 260 is provided with a second through hole, and the pressure ejector rod 440 extends into the closed chamber 210 through the second through hole. Specifically, the heating element 220 in this embodiment can be slidably connected to the outer wall of the guiding element 250 up and down, so as to facilitate the sample 500 to be taken and placed while ensuring the formation of the closed cavity 210 during the test.
Further, the heating element 220 is an infrared heating tube. Specifically, the infrared heating tube is a heating manner of heat radiation, so that the heating element 220 only heats the sample 500 when heating the sample 500, and the heating temperature of the space of the closed cavity 210 is lower than the heating temperature of the sample 500, thereby avoiding the distortion of the test result caused by the influence of the space temperature of the closed cavity 210 on the force sensor 240, and further improving the accuracy of the test.
Further, the sample holder 230 is made of quartz glass. In particular, the quartz glass sample holder 230 is capable of isolating the temperature of the sample 500 from being transferred to the force sensor 240, on the one hand, thereby protecting the force sensor 240. On the other hand, the sample holder 230 of quartz glass is transparent, so that the heat of the heating means can be transferred to the sample 500 through the sample holder 230, thereby ensuring a more uniform temperature of the sample 500.
Further, a slider 460 is disposed at one end of the lifting bracket 410 connected to the upright post 110, the slider 460 is sleeved on the upright post 110, the slider 460 is connected to a first driving member, and the first driving member drives the slider 460 to lift up and down along the upright post 110. In some embodiments, the first driving member is an oil cylinder, a gas cylinder or other structures capable of achieving linear motion, such as an electric cylinder. Specifically, in this embodiment, the first driving member drives the slider 460 to lift the lifting bracket 410, so that the structure is simple, and the operation is stable and reliable.
Further, the working chamber 200 further includes a lifting cylinder, the telescopic end of which is connected to the heating element 220, and the lifting cylinder stretches to drive the heating element 220 to lift. Working chamber 200 also includes a guide rail disposed on the outer wall of guide 250 and a slider coupled to the guide rail and coupled to the inner wall of heating element 220.
Further, the present application further includes a spacer 600, the spacer 600 being provided between the sample holder 230 and the sample 500, and the upper surface of the sample 500 being also provided with the spacer 600.
The method takes glass as a specific research object, and provides a viscoelasticity calculation method based on micro axial creep to accurately acquire viscoelasticity data of the glass, and the method specifically comprises micro axial creep test, short-term modulus test, viscoelasticity characterization calculation and finite element analysis verification.
The application avoids the limitation of the existing calculation method in the aspect of converting axial creep data into viscoelasticity shear relaxation modulus, and particularly can not calculate viscoelasticity under the condition that the Poisson's ratio of glass is unknown at high temperature.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations and modifications of the present invention will be apparent to those of ordinary skill in the art in light of the foregoing description. It is not necessary here nor is it exhaustive of all embodiments. And obvious changes and modifications which are extended therefrom are still within the scope of the invention.
Claims (10)
1. An instrument for accurately testing the viscoelasticity parameter of an optical glass material is characterized by comprising the following components:
a frame comprising an upright;
The working cavity comprises a closed cavity arranged at one side of the upright post, a heating piece arranged at the periphery of the closed cavity, a sample support and a force sensor, wherein the sample support and the force sensor are arranged in the closed cavity, and the force sensor is arranged at the bottom of the sample support;
The force module comprises a first driving piece, a lifting bracket, an electromagnetic inductor, a lower pressing block and a pressure ejector rod, wherein the lifting bracket is connected to the upright post in a sliding way, the electromagnetic inductor is arranged on the lifting bracket, the lower pressing block and the pressure ejector rod are arranged at the bottom of the lower pressing block, the lower pressing block is arranged on one side of the lifting bracket, on which the electromagnetic inductor is arranged, the lower pressing block is arranged in parallel, the lifting bracket can lift up and down to drive the pressure ejector rod to be in contact with the sample, and the electromagnetic inductor can provide downward step force for the lower pressing block and the pressure ejector rod after being electrified;
the displacement detection assembly comprises a displacement sensor arranged at the top of the lower pressing block, and the displacement sensor is used for monitoring axial deformation of the sample after being stressed.
2. The apparatus of claim 1, further comprising a control assembly electrically coupled to the heating element, the force sensor, the electromagnetic sensor, and the first driving element.
3. The apparatus for precisely measuring the viscoelasticity parameters of the optical glass material according to claim 1, wherein the frame further comprises a base fixedly connected to the bottom of the upright post and a top plate fixedly connected to the top of the upright post, and the working cavity is arranged on the base.
4. The apparatus for precisely measuring the viscoelasticity parameters of the optical glass material according to claim 3, wherein the displacement sensor comprises a detection body connected with the frame and a sensor connecting rod arranged at the bottom of the detection body, the displacement detection assembly further comprises a cover body arranged at the top of the top plate, and the sensor connecting rod penetrates through the first through hole of the top plate and then is connected with the pressing block.
5. The apparatus for precisely testing the viscoelasticity parameters of the optical glass material according to claim 3, wherein the working chamber further comprises a guide member and a cover plate, the heating member is connected to the outer wall of the guide member in an up-down sliding manner, a closed chamber is formed by surrounding the heating member, the cover plate and the guide member after the heating member rises, the cover plate is connected to one side of the upright post, the cover plate is provided with a second through hole, and the pressure ejector rod penetrates through the second through hole and stretches into the closed chamber.
6. The apparatus for precisely measuring the viscoelastic parameters of an optical glass material according to claim 5, wherein the working chamber further comprises a lifting cylinder, the telescopic end of the lifting cylinder is connected with the heating element, and the lifting cylinder stretches and contracts to drive the heating element to lift.
7. The apparatus for precisely measuring the viscoelastic parameters of an optical glass material according to claim 6, wherein the working chamber further comprises a guide rail arranged on the outer wall of the guide member and a slide block matched with the guide rail, and the slide block is connected to the inner wall of the heating member.
8. The apparatus for precisely measuring the viscoelastic parameters of an optical glass material according to claim 1, wherein the heating element is an infrared heating tube.
9. The apparatus for precisely measuring the viscoelasticity parameters of the optical glass material according to claim 1, wherein a slider is arranged at one end of the lifting support, which is connected with the upright post, the slider is sleeved on the upright post, the slider is connected with the first driving piece, and the first driving piece drives the slider to lift up and down along the upright post.
10. A method for precisely testing the viscoelasticity parameter of an optical glass material is characterized by comprising the following steps of:
The electromagnetic sensor is electrified to provide downward step force for the lower pressing block, the step force is applied to the sample to deform the sample, the force sensor monitors the value of the step force applied to the sample, and the displacement sensor monitors the axial deformation of the sample after being stressed.
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