JPS6310513Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a sample holder for mounting an extensometer in tensile testing of wire and plate materials, especially ultra-fine wires, foils, etc. It is easy to install and lightweight, allowing accurate elongation measurement. This is how it was done.

Conventionally, a differential transformer type strain meter or a strain gauge type strain meter is used as an extensometer to measure the yield strength and elastic modulus by tensile tests of wires and plates. 3, the knife edge 5 provided at the tips of both legs 4a and 4b of the extensometer 4 is placed on both gauge points of the sample 1, the sample holder 7 is attached to this, and the clamping tool 8 of the knife edge 5 and the sample holder 7 is Sample 1 is held between the two, and extensometer 4 is fixed to sample 1. The sample holder 7 is attached to the legs 4a and 4b of the extensometer as shown in Figure 2 A and B.
A cylinder 10 is provided between both hooks 9a and 9b which are hung on a pair of left and right arms 6a and 6b provided at the tip, and a presser 8 that protrudes by a spring 11 is inserted into the cylinder 10, and a retractor is inserted into the presser 8. This device is equipped with a knob 12. Pull the knob 12 to hang the hooks 9a, 9b on the arms 6a, 6b, and the elasticity of the spring 11 will cause the knife edge 5 to
The extensometer 4 is fixed to the sample 1 by holding the sample 1 between the presser and the presser 8.

This type of sample holder has a complicated structure, so
The weight is heavy, and when used for measuring ultra-fine wires, wires, etc., as shown in FIG. 3, sample 1 bends or flexes when the extensometer is attached, making it difficult to attach it. In addition, sample 1 was easily damaged by the knife edge 5, and there were many gauge cuts, making it impossible to obtain accurate elongation, making it difficult to measure yield strength and elastic modulus.

In view of this, and after various studies, we have developed a sample holder for extensometers that has a simple structure, is lightweight, is easy to install, and does not cause bending or deflection of the sample. A hook is provided at both ends to hang the arm of the extensometer knife edge placed on the gauge point of the sample, a cushion material is attached to the center of the leaf spring, and a sample slip prevention material is provided at the tip of the cushion material via a hard layer. The feature is that the extensometer is fixed by clamping the sample using the elasticity of the leaf spring between the sample slide prevention devices.

This will be explained in detail using the drawings.

Figures 4A and 4B show an embodiment of the sample holder of the present invention. In the figures, 1 is the sample, 4a,
4b is the extensometer leg, 5 is the extensometer knife edge 6
a and 6b are arms provided at the ends of the legs 4a and 4b of the extensometer; 9a and 9b are hooks for hanging on the arms 4a and 4b; 13 is a leaf spring; and 14 is a cushion material that extends from both ends of the leaf spring 13. Gauge legs 4a, 4b
A cushion material 14 is attached to the center of the leaf spring 13, and a hard layer 15 is formed at the end of the cushion material 14. A sample slip stopper 16 is provided on the top, and the knife edges 5 provided at the tips of both legs 4a and 4b of the extensometer are placed on the gauge points of the sample 1 clamped to both the upper and lower chucks.
Push out both ends of the leaf spring 13 and attach the hooks 9a, 9b.
are hung on the arms 6a and 6b, and the extensometer is fixed to the sample 1 by clamping the sample 1 between the knife edge 5 and the sample slip stopper 16 by the elasticity of the leaf spring.

The cushioning material 14 may be a lightweight cushioning material such as foamed plastic or sponge, the hard layer 15 may be a thin steel plate or the like, and sandpaper may be used to prevent slipping.

The sample holder of the present invention has the above-mentioned structure, and by using cushioning materials such as foamed plastic or sponge as a holding device to press the sample against the knife edge of the extensometer, the weight is significantly reduced, the structure is simple, and the extensometer can be easily installed. Since it is easy to use, the sample will not be bent when the extensometer is attached, and there is no risk of the sample being damaged by the knife edge of the extensometer.

As described above, the sample holder of the present invention has the remarkable effect of being able to accurately measure the elongation of wires and plates, especially when measuring the yield strength and elastic modulus of ultrafine wires and foils through tensile tests. .

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of a tensile test using a conventional specimen holder, Fig. 2A and Fig. 2B show an example of a conventional specimen holder, Fig. 2C is a side view and Fig. 2C is a front view, Fig. 3 is an explanatory diagram showing the bending of a specimen when a conventional specimen holder is used, Fig. 4A and Fig. 4B show an embodiment of the specimen holder of the present invention, Fig. 4C is a side view and Fig. 4C is a front view. 1... specimen, 2, 3... chuck, 4... extensometer, 5... knife edge, 6a, 6b... arm, 8... clamp, 9a, 9b... hook, 13
...Spring plate, 14...Cushioning material, 15...Hard layer, 16...Anti-slip.

Claims (1)

[Scope of utility model claims] A hook is provided at both ends of the leaf spring to hang the arm of the extensometer knife edge placed on the gauge point of the sample, a cushion material is attached to the center of the leaf spring, and a sample slip prevention material is provided at the tip of the cushion material via a hard layer. A sample holder for an extensometer, characterized in that the extensometer is fixed by clamping the sample between a knife edge and a sample slip stopper using the elasticity of a leaf spring.