Dynamic response of thermo-viscoelasticity of three-dimensionally braided composites

Abstract

Dynamic response of thermo-viscoelasticity of 3D braided composites is studied by a numerical method proposed in this article. The strain response of 3D braided composites to alternating stress load at room temperature is obtained by the theoretical derivation and finite element analysis. The complex compliance of 3D braided composites is derived from the creep compliance, and the relationship between the complex compliance and angular frequency is investigated. With the increase of angular frequency, 3D braided composites behave elastically gradually. Based on the equivalent thermal expansion coefficient assumption, the thermal effects on the dynamic viscoelasticity are characterized by the time–temperature equivalent relationship. The dynamic response derived in this article for 3D braided composites with thermal effects agrees well with the finite element analysis. The influence of braiding angles and fiber volume fractions on the steady-state strain response of 3D braided composites is investigated.

Keywords

3D braided composites thermo-viscoelasticity dynamic response finite element analysis

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