Overview and Metrics of the Small Punch Test

Four basic metrics are obtained from a load-displacement curve of a material subjected to the small punch test. These include e initial stiffness, peak load, ultimate load, and the maximum displacement at failure. A fifth derived metric, integral work to failure (WTF), is found by integrating the area imder the 

During the development of the small pimch test for UHMWPE, a validation analysis was performed comparing the results obtained from small punch 

Representative load-displacement curve developed by testing of a small punch Sf ecimen in equib-laxial tension curve here reflects typical behavior of GUR 1020. Primary metrics including initial stiffness, peak load, ultimate load, and ultimate displacement. WTF shown in grey. Unirradiated UHMWPE exhibits a bend and a stretch region as shown. 

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