The choice of the relative height of samples for tests on compression

Axial compression testing is useful procedure while studying the properties of materials. They are extremely important while studying the properties of materials which compressing strength is substantially higher than tensile strength. The optimal sizes of cylindrical samples for compression testing are suggested theoretically and experimentaly. Two extreme cases are calculated by the method of finite elements: compression of the sample between rigid plates with an infinitely large friction and without friction. The relationships allowing to determine the size of the sample depending on the base of measuring strain are got. An experimental curve showing at what sizes of the sample the friction at the ends of it does not affect the accuracy of determination of the strength characteristics.

References

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[3] ASTM Standard D 695. Standard Method for Compressive Properties of Plastics, ASTM International, Pa., 2002.

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