GB/T 45159.5-2025 Mechanical vibratin and shock—Characterizatin of the dynamic mechanical properties of visco-elastic materials—Part 5:Poisson ratio based on comparison between measurements and finite element analysis

Scope

This document describes two methods for estimating the Poisson's ratio and/or elastic modulus of isotropic viscoelastic materials or porous elastic materials, which are used in linear finite element method (FEM) calculations or other numerical methods for vibration or acoustic problems of complex geometric viscoelastic structures. The method is based on comparing the measurement results with the finite element analysis results by comparing the load-displacement or stiffness characteristics of a disk specimen fixed at both ends with the finite element analysis results of the same working condition as a function of Poisson's ratio. The choice of single-sample or double-sample measurement methods depends on whether the target parameter measured is only Poisson's ratio or both Poisson's ratio and elastic modulus. Sometimes, such materials are considered incompressible and exhibit nonlinear behavior, especially when large static deformations occur. Many commercial software can be used to solve such nonlinear problems. However, this document only considers the small deformation behavior exhibited in typical vibration problems, so a linear finite element model is sufficient to meet the accuracy requirements and is more convenient to use.

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