ASTM D638 Test Method – Tensile Properties and Poisson’s Ratio of Plastics
ASTM D638 helps to determine plastic material tensile properties. A Universal Testing Machine measures the force required to break a specimen and the extent to which the specimen stretches or elongates to that breaking point. Poisson's Ratio is useful data for plastics engineering design purposes. This test technique is required by some material specifications, but there are some procedural changes that take precedence when conforming to the specification. So, before applying this test method, it is advised to consult that material specification.
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