CN204988983U - Clad steel plate combines interface adhesive strength detection to use clad steel plate sample - Google Patents

Abstract

The utility model provides a clad steel plate combines interface adhesive strength detection to use clad steel plate sample, include compound layer, basic unit and tie coat, its characterized in that is compound, and establish to the cuboid on the layer, and it is continuous with the frustum of basic unit that this cuboid passes through the tie coat, and the frustum of basic unit is as an organic whole with the cuboid of basic unit. Not only detecting the precision height, moreover can be accurately combining the adhesion strength at interface to detect with the basic unit to compound layer, fundamentally have solved prior art and has examined time measuring carrying out the clad steel plate adhesive strength, system appearance difficulty, detects the technological problem of the unable detection of low, the thin specification clad steel plate adhesive strength of accuracy.

Description

Composite steel plate sample for testing bond strength of composite steel plate joint interface

technical field

The utility model relates to a composite steel plate sample used in conjunction with a clamp for testing the bonding strength of a composite steel plate bond interface, and belongs to the technical field of composite steel plate testing equipment.

Background technique

The interfacial bonding strength is the ability to characterize the tear resistance of the joint interface of the clad steel plate under the action of the normal force, and is an important index for evaluating the joint strength of the clad steel plate. The length of the test sample for the interface bonding strength of the composite steel plate is the thickness of the composite steel plate. At present, the thickness of the conventional composite steel plate is only about 10mm, and the thickness of the clad layer is only a few millimeters. It is impossible to directly clamp the test sample with a tensile testing machine. for tensile testing. The national standard GB-T6396 recommends the test method for the interface bonding strength of composite steel plates: when preparing samples, drill blind holes on the thicker base layer of the composite steel plate samples by machining. The depth of the blind holes must be greater than the thickness of the base layer but It cannot be greater than the total thickness of the clad steel plate; when testing, use a cylindrical indenter to extend into the blind hole of the sample to apply normal pressure until the clad layer falls off. It can be seen that the existing detection methods are complex in sample preparation, and blind holes need to be drilled on the sample, which cannot be processed by precise cutting equipment such as wire cutting, and can only be processed by machine tools. During mechanical processing, on the one hand, the vibration and impact are relatively large, which will have a certain impact on the bonding interface of the composite steel plate, thereby affecting the accuracy of the test results, and cannot truly reflect the ability of the bonding interface of the composite steel plate to resist normal tearing. The combination of the base layer and the clad layer of the clad steel plate is poor, and even cracks may appear during the sample preparation process, resulting in the failure of sample preparation; During the process, it is easy to break through the sample or fail to penetrate the bonding interface, which leads to the failure of sample preparation. Secondly, the detection accuracy of this method is low, and the indenter needs to be inserted into the blind hole of the sample to apply pressure during the detection, so that the circular tested area of the sample is evenly stressed, and the bottom of the blind hole on the sample is drilled by machining. There is a certain taper, so it is difficult to ensure that the annular tested area of the sample is evenly stressed during the test, which will inevitably cause pressure concentration and affect the accuracy of the test results. More importantly, for clad steel plates with a thickness of less than 10 mm, the thickness of the clad layer is only about 1 mm, and it is impossible to realize sample preparation and testing with existing methods. Therefore, it is necessary to improve the prior art.

Contents of the invention

The purpose of the utility model is to provide a composite steel plate sample used in conjunction with a fixture for testing the bonding strength of the bonding interface of the composite steel plate, which can accurately detect the bonding strength of the bonding interface of the composite steel plate.

The utility model is completed through the following technical solutions: a composite steel plate sample used in conjunction with a fixture for testing the bonding strength of the composite steel plate interface, including a composite layer, a base layer and a bonding layer, and is characterized in that the composite layer is set as a rectangular body, The rectangular body is connected with the frustum of the base layer through the adhesive layer, and the frustum of the base layer is integrated with the rectangular body of the base layer, so that the multi-layer of the rectangular body and the base layer of the rectangular body are placed in the corresponding upper and lower clamping parts respectively during detection. in the slot of the handle.

The frustum is a rectangular frustum with a small upper end and a larger lower end. The upper end is connected to the rectangular body of the multilayer through the bonding layer, and the lower end is connected to the rectangular body of the base layer, so that the bonding at the interface between the layer and the base layer The layer area is the smallest, and then it can only be disconnected from the bond during detection to achieve the detection effect.

The fixture for testing the bonding strength of the composite steel plate joint interface includes upper and lower clamping handles respectively matched with the upper and lower chucks of the tensile testing machine, wherein the opposite ends of the upper and lower clamping handles are provided with through holes. There is an opening at the bottom of the through groove, which is connected with the through groove, so that after the upper and lower clamping handles are connected, the sample to be tested is inserted into the corresponding through groove of the upper and lower clamping handles, that is, Can be tested.

The through groove and the opening at the bottom of the through groove form an inverted convex structure to facilitate clamping of the sample.

The groove wall between the through groove and the groove bottom opening is set in an arc shape to increase the strength of the groove wall and prevent the through groove from being deformed during stretching.

The outer surface of the handle end of the clamping handle is provided with an anti-slip concave-convex surface to prevent it from slipping when stretched.

The utility model has the following advantages and effects: adopting the above scheme, not only the sample preparation is simple, but also the sample with the required structure can be obtained by direct machining. That is, not only the detection accuracy is high, but also the bonding strength of the bonding interface between the composite layer and the base layer can be detected accurately, which fundamentally solves the difficulty in sample preparation and accurate detection in the prior art when testing the bond strength of composite steel plates It is an ideal fixture for testing the bonding strength of the bonded interface between composite steel plates and its matching samples.

Description of drawings

Fig. 1 is the clamp front view of the utility model;

Fig. 2 is the left view of Fig. 1;

Fig. 3 is the sample structural diagram of the utility model;

Fig. 4 is the A-A sectional view of Fig. 3;

Fig. 5 is a detection structure diagram of the combination of the clamp and the sample of the present invention.

detailed description

Below in conjunction with accompanying drawing, the utility model is further described.

The composite steel plate sample provided by the utility model and used in conjunction with the fixture for testing the bonding strength of the composite steel plate interface includes a composite layer, a base layer and a bonding layer, wherein the composite layer is set as a rectangular body 5, and the rectangular body 5 is bonded Layer 6 is connected with the frustum 7 of the base layer, and the frustum 7 of the base layer is integrated with the rectangular body 8 of the base layer; The layered rectangular body 5 is connected, and the lower end is connected with the rectangular body 8 of the base layer as a whole, so that the area of the adhesive layer 6 at the joint interface between the compound layer and the base layer is minimized, and then it can only be disconnected from the adhesive layer 6 during detection. Achieve detection results, as shown in Figure 3 and Figure 4.

The fixture for testing the bonding strength of the composite steel plate joint interface includes upper and lower two clamping handles 1 respectively matched with the upper and lower clamps of the tensile testing machine, and the opposite ends of the upper and lower two clamping handles 1 are provided with Through groove 2, the groove bottom of through groove 2 is provided with opening 4, and this opening 4 is communicated with through groove 2; Described through groove 2 and the opening 4 of the groove bottom of through groove 2 form an inverted convex-shaped structure, to facilitate clamping test sample; the groove wall 3 between the through groove 2 and the groove bottom opening 4 is set as an arc shape to increase the strength of the groove wall and prevent the through groove from being deformed in the stretching process; the outer surface of the handle end of the clamping handle 1 Anti-slip concave-convex surface is provided to prevent it from slipping when stretched, as shown in Figure 1 and Figure 2.

When working: After matching the ends of the upper and lower clamping handles 1 with the corresponding upper and lower chucks of the tensile testing machine, make the opposite ends of the upper and lower clamping handles 1 (with the slot 2) One end) as close as possible, and then the multi-layered rectangular body 5 and the base layered rectangular body 8 of the sample are respectively snapped into the through grooves 2 opposite to the upper and lower clamping handles 1, as shown in Figure 3, then in the working condition of the tensile testing machine Move the upper and lower clamping handles 1 up and down respectively, so that the sample is stretched until it is disconnected from the adhesive layer 6. At this time, according to the maximum tensile force F recorded by the tensile testing machine and the cone 7 The area S of the upper end surface is calculated according to the following formula to obtain the interface bond strength σ of the clad steel plate:

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Claims (2)

1. a clad sheet steel combination interface bonding strength detects and uses clad sheet steel sample, comprise cladding, basic unit and tack coat, it is characterized in that cladding is set to cuboid, this cuboid is connected with the frustum of basic unit by tack coat, and the frustum of basic unit and the cuboid of basic unit are integrated.

2. clad sheet steel combination interface bonding strength detection clad sheet steel sample according to claim 1, it is characterized in that described frustum is rectangle frustum, its upper end is little, and lower end is large, upper end is connected with cladding cuboid by tack coat, and the cuboid of lower end and basic unit is connected as a single entity.