ASTM E132-17 covers the determination of Poisson’s ratio from tension tests of structural materials at room temperature. This test method is limited to specimens of rectangular section and to materials in which and stresses at which creep is negligible compared to the strain produced immediately upon loading.
The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.
Terminology
3.1 Definitions:Terms common to mechanical testing.
3.1.1 The definitions of mechanical testing terms that appear in Terminology E6 apply to this test method. These terms include extensometer and stress-strain diagram.
3.1.2 In addition, the following common terms that appear in Terminology E6 apply to this test method.
3.1.3 The terms accuracy, bias, and precision are used as defined in E177.
3.1.4 axial strain, n—linear strain in a plane parallel to the longitudinal axis of the specimen.
When uniaxial force is applied to a solid, it deforms in the direction of the applied force, but also expands or contracts laterally depending on whether the force is tensile or compressive. If the solid is homogeneous and isotropic, and the material remains elastic under the action of the applied force, the lateral strain bears a constant relationship to the axial strain. This constant, called Poisson’s ratio, is an intrinsic material property just like Young’s modulus and Shear modulus.
Forces—Forces shall be applied either by verified dead weights or in a testing machine that has been calibrated in accordance with Practices E4.
ASTM E132-17,Standard Test Method for Poisson’s Ratio at Room Temperature.
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