DAMAGE MECHANISM ANALYSIS OF 2D 1×1 BRAIDED COMPOSITES UNDER UNIDIRECTIONAL TENSION  

作　　者：张超 许希武 陈康 

机构地区：[1]State Key Laboratory of Mechanics and Control of Mechanical Structures,Nanjing University of Aeronautics and Astronautics

出　　处：《Transactions of Nanjing University of Aeronautics and Astronautics》2013年第4期317-327,共11页南京航空航天大学学报（英文版）

基　　金：Supported by the National Natural Science Foundation of China(10672075)

摘　　要：Coupling with the periodical displacement boundary condition,a representative volume element(RVE) model is established to simulate the progressive damage behavior of 2D1×1 braided composites under unidirectional tension by using the nonlinear finite element method.Tsai-Wu failure criterion with various damage modes and Mises criterion are considered for predicting damage initiation and progression of yarns and matrix.The anisotropic damage model for yarns and the isotropic damage model for matrix are used to simulate the microscopic damage propagation of 2D1×1braided composites.Murakami′s damage tensor is adopted to characterize each damage mode.In the simulation process,the damage mechanisms are revealed and the tensile strength of 2D1×1braided composites is predicted from the calculated average stress-average strain curve.Numerical results show good agreement with experimental data,thus the proposed simulation method is verified for damage mechanism analysis of 2D braided composites.Coupling with the periodical displacement boundary condition, a representative volume element （RVE） model is established to simulate the progressive damage behavior of 2D 1×1 braided composites under unidirection- al tension by using the nonlinear finite element method. Tsai-Wu failure criterion with various damage modes and Mises criterion are considered for predicting damage initiation and progression of yarns and matrix. The anisotropic damage model for yarns and the isotropic damage model for matrix are used to simulate the microscopic damage propagation of 2D 1×1 braided composites. Murakami＇s damage tensor is adopted to characterize each damage mode. In the simulation process, the damage mechanisms are revealed and the tensile strength of 2D 1 × 1 braided composites is predicted from the calculated average stress-average strain curve. Numerical results show good agreement with experimental data, thus the proposed simulation method is verified for damage mechanism analysis of 2D braided composites.

关 键 词：2D braided composites representative volume element （RVE） failure modes damage mechanism strength prediction 

分 类 号：V2[航空宇航科学技术]