Stiffness and Strength Analysis of 2D Woven Composite Materials Based on Multi-scale Finite Element Method

This study is based on the multi-scale finite element method and establishes RVE model of 2D woven fiber yarn and woven structure. The Stiffness matrix of plain, satin and twill 2D braided composites is calculated by applying Periodic boundary conditions and tensile shear loads in six directions. Write a UMAT subroutine to perform finite element simulation of the strength of woven RVE based on the three-dimensional Hashin failure criterion, and compare and verify it with existing experimental data. By comparing the load displacement curves of three types of braided composite materials under the same volume fraction, the stiffness and strength characteristics of the three types of braided composite materials, as well as the mechanical performance similarity issues caused by structural similarity, are studied.