Strain Hardening Modulus (SHM) is of increasing international interest to plastics experts on polyethylene pressure piping for its capability to provide a useful index of the slow-crack growth (SCG) performance of polyethylene (PE) materials. Recently, a broad industry initiative has started to formalize an ASTM International test method to measure SHM. This effort is driven by several likely benefits to industry including the significant reduction in time required for SHM measurement in comparison to traditional SCG test methods. This paper will update the literature establishing the capabilities of SHM to replace traditional SCG test methods and provide a progress report in creating a North American standard for this useful test.
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