Selection Of Grips
The selection of grips depends upon the material, geome-
try and strength of the test specimen; but the tensile
strength of the test specimen should be a primary consid-
eration. If, for example, a material has a tensile strength
of 500 lbf, then pneumatic grips should not be used, as
these grips are designed for loads not exceeding 200 lbf.
Always determine the capacity of the grips being used
prior to a test and do not overload test fixtures.
Examples of gripping techniques are shown in Table A-
1. In many cases you will have to experiment with sev-
eral gripping techniques to eliminate or minimize
slippage in the grips. For grips with interchangeable
faces, such as screw-action and pneumatic-action types,
the serrated, flat and rubber-coated faces can be tried to
determine the best method.
Appendix A
Test Planning
Selection Of Grips
A-5
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