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Thus, Young’s modulus or elastic modulus, E is related to shear modulus G through a relationship E=2G (1+Γ), where n is Poisson’s ratio. For these materials, it is usually due to uniquely oriented, hinged molecular bonds. Just like several mechanical properties like Yield, ultimate strength, etc., Poisson ratio helps in the design of structures. We use biaxial strain gage or dual extensometer to measure the deformation. 1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. Gu et al. This can also be done in a structured way and lead to new aspects in material design as for mechanical metamaterials. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard. Poisson's ratio is a parameter, intrinsic property of the material, which can easily be determined experimentally by measuring the longitudinal relative elongations. 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. Visit Copyright Clearance Center, Historical Version(s) - view previous versions of standard, More E28.04 Standards Poisson’s ratio relates various moduli of materials. 4.6 The accuracy of the determination of Poisson's ratio is usually limited by the accuracy of the transverse strain measurements because the percentage errors in these measurements are usually greater than in the axial strain measurements. Generally, Poisson’s ratio is measured in the elastic range of a simple tensile test. 1.1 This test method covers the determination of Poisson’s ratio from tension tests of structural materials at room temperature. ���ҵڢ��*�Gi 2. This constant, called Poisson’s ratio, is an intrinsic material property just like Young’s modulus and Shear modulus. Standard References. 1.2 The values stated in inch-pound units are to be regarded as standard. 2 0 obj <>stream 1.1 This test method covers the determination of Poisson’s ratio from tension tests of structural materials at room temperature. Equally when the material is stretched it will contract in other directions. 4.5 Deviations from isotropy should be suspected if the Poisson’s ratio, μ, determined by the method described below differs significantly from that determined when the ratio E/G of Young’s modulus, E, to shear modulus, G, is substituted in the following equation: where E and G must be measured with greater precision than the precision desired in the measurement of μ. 4.1 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. Brecht and Wanka determined its value with a microscope mounted above a strained paper piece [6]. If the customer requires we can measure Poison’s ratio in non-ambient conditions like low temperatures or high temperatures. 1 0 obj <>/ColorSpace<>/Font<>/ProcSet[/PDF/Text/ImageC/ImageI]/ExtGState<>>>/Type/Page>> endobj �Pf�Ѯz��-A#L��t [eJnS�\�Y�g�3����n:�!���l.

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