ASTM D638, ISO 527-1 Standard Test Method for Determining Tensile Properties of Plastics
ASTM D638 and ISO 527-1 are technical equivalents. This test method is designed to determine the tensile properties of plastic materials. And can be used for testing materials of any thickness up to 14 mm (0.55 in.). However, it is preferable to use ASTM Test Methods D882 for specimens of thin sheeting including films less than 1.0 mm (0.04 in.). All materials of a thickness of greater than 14 mm.[0.55in.] must be reduced by machining before this method can be applied.
The Tensile Properties of reinforced and unreinforced plastics may be determined using standard dumbbell-shaped test specimens tested under defined conditions of pretreatment, temperature, humidity, and testing machine speed. These properties include: True Stress and Strain, Engineering Stress and Strain, the Elastic Modulus, the Ultimate Tensile Strength, the Fracture Stress, the Modulus of Toughness, and the Modulus of Resilience.
Poisson's ratio at room temperature also may be determined using the ASTM D638 test method. Poisson's ratio is a measure of transverse strain versus axial strain when uniaxial stress is applied.
Poisson's ratio is important when an engineer needs to design for all dimensional changes due to applied forces. Poisson's ratio is also employed when applying the generalized theory of elasticity to structural analysis.
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