JPH051804Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a support device for an observation device used for observing a test piece under load in material testing.

[Prior Art] There is a demand for continuous observation of a specific observation position of a test piece under load at high magnification, regardless of the strength of the load or the direction of the load. The conventional method used in such cases is to fix an observation device such as a microscope to a frame, provide actuators on both sides of the frame, apply a load to the test piece while maintaining balance with the actuators on both sides, and then fix it to the frame. This is a method of observing with a built-in observation device.

[Problems to be Solved by the Invention] However, in the conventional method described above, actuators must be provided on both sides of the frame, so there is a problem that the test equipment becomes expensive.

[Means for Solving the Problems] In order to solve the above problems, the present invention employs the following configuration. That is, the material testing machine according to the present invention is a material testing machine in which a load is applied by the actuator to a test piece held between a frame and an actuator that moves relative to the frame. A holder for attaching an observation device is provided, which is movably supported by a
The ends of the pair of elastic supports are each fixed, the opposite end of one elastic support is fixed to the frame, and the opposite end of the other elastic support is fixed to the actuator. .

[Operation] During loading, the actuator moves relative to the frame, but elastic supports with equal spring constants are provided on both sides of the holder that supports the observation device, and the other end of one elastic support is attached to the frame, while the other end is attached to the frame. The other ends of the elastic supports are attached to actuators, so even if the test piece expands and contracts, the relative position of the test piece and holder is always kept constant, making it possible to continue observing the desired observation position. can.

[Example] Figure 1 shows an example of the present invention.
This observation device support device 1 is attached to a load device 5 composed of a fixed frame 2 and an actuator 3. The actuator 3 includes a piston 9 provided within a cylinder tube 7, and a piston rod 13 is integrally attached to the piston. The piston 9 is moved back and forth by the oil pressure supplied from the oil pressure supply ports 10 and 11. The tip of the piston rod 13 inserted into the frame 2 is connected to the flange 17 of the test piece support 17 via a load cell 15 for pressure detection.
A is attached.

A flange 19 is provided at the end of the frame 2 opposite to the actuator 3, and the other test specimen support 18 is attached to this flange. Both ends of the test piece 20 are attached to these test piece supports 17 and 18.

Inside the center of the frame 2, rails 22, . The holder 25 is formed into a donut shape with a through hole 25a in the center, and elastic bellows 26, 27, which are elastic supports, are provided on both sides of the holder 25.
The ends of each are fixed in a pressed state. The other end of one of the pair of bellows 26 arranged in series with the holder 25 in between is attached to a flange 17a provided on the test piece support 17 on the actuator 3 side.
The other end is attached to the inner end surface of the frame 2. Both bellows 26 and 27 are formed to have the same spring constant, so that the amount of expansion and contraction during loading is the same. The test piece support 17,1
8 and the test piece are attached to both the bellows 26, 27 so that the holder 25 is located exactly in the center of the test piece.
The inside of the bellows is designed to be evacuated. Note that a sub bellows 2 is provided on the back side of the flange 17a of the test specimen support 17 on the actuator side to remove the influence of atmospheric pressure, etc.
9 is provided. Since the interior of the bellows 26 and 27 is a vacuum, if the bellows 29 were not present, the force due to atmospheric pressure acting on both sides of the flange 17a would be different on the left and right sides, and the right side would be smaller by the cross-sectional area of the bellows 26. By making the cross-sectional area of the bellows 29 equal to the cross-sectional area of the bellows 26, the acting force of the atmospheric pressure can be balanced.

An observation device such as a scanning electron microscope is attached to the holder 25 of the support device 1, for example. During the test, the actuator 3 is driven to remove the test piece 2 supported between the test piece supports 17 and 18.
Apply an axial load of 0. As a result, the test piece 20 expands and contracts, but the holder that supports the microscope for test piece observation
It is supported by pressure from both sides by 6 and 27,
Since the amount of movement of the piston rod 13 is evenly distributed to the bellows on both sides, even if the test piece 20 expands or contracts, the relative positional relationship between the observation position and the microscope is always kept constant, and as a result, the load direction and its strength are Regardless, it is possible to continue observing at high magnification. Note that the weight of the holder 25 and the observation device attached to it is supported by the rails 22, . . . .

In the above embodiment, elastic bellows are used as elastic supports provided on both sides of the holder, and the test is conducted in a vacuum.
When testing in the atmosphere, a coil spring or the like may be used as the elastic support instead of the bellows.

[Effects of the invention] As explained above, the material testing machine according to the invention can continue to stably observe a predetermined observation position of a test piece, regardless of the direction or strength of the load applied to the test piece. It became possible. This support device is inexpensive in terms of cost since it is not necessary to provide actuators on both sides of the specimen for balance.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing one embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Support device, 2... Frame, 3... Actuator, 5... Load device, 20... Test piece,
26, 27... Bellows (elastic support).

Claims (1)

[Scope of utility model registration request] For mounting an observation device supported movably along a test piece in a material testing machine in which a load is applied by the actuator to a test piece held between a frame and an actuator that moves relative to the frame. A holder is provided, and the ends of a pair of elastic supports having the same spring constant are fixed to both sides of the holder, and the opposite end of one elastic support is fixed to the frame, and the other elastic support is fixed to the frame. A material testing machine characterized in that the opposite end of the support is fixed to an actuator directly or via a member such as a flange.