ASTM D638-14 Poisson's Ratio for Plastics
Plastics tensile standards, such as ASTM D638, cover a range calculations including Poisson's Ratio - a calculation that has proven to be challenging to obtain repeatable and accurate results.
Poisson’s Ratio is measured anywhere in the linear region as long as the linear region extends past 0.25% strain. When the linear region does not extend to this strain value, the calculation is taken between 0.25% to 0.5% strain.
The challenges of testing to this standard are:
It is important to review ASTM D638-14 (A3) in order to fully understand the test setup, procedure, and results requirements.
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