Everything depends on your task. It is necessary to define to you a limit of fluidity or limit deformation? I would offer two options. The first - to glue metal strips with the elasticity module, close to copper, of the studied strip, so on each side to leave a pure working zone 3-5 long in the center of a sample and to carry out test for compression with side support. Other decision to glue the studied strip on the top party of whetstone of fibreglass and to carry out test for the 4-point bending thus your strip will appear in a compression zone, and knowing deformation of whetstone and the module of elasticity you will calculate durability at compression.
َASTM E9 says : Sample height should higher 1.5 times its width. Based on my sample thickness is not possible.
Thank you for your answer.
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