A multiscale elasto-plastic damage model for the nonlinear behavior of 3D braided composites

A two-step, multi-scale progressive damage analysis is implemented to study the damage and failure behaviors of 2D plain weave composites under various uniaxial and biaxial loadings. In the progressive damage mode (PDM), a formal-unified 3D Hashin-type criterion is formed to facilitate analysis work and engineering application, with shear nonlinearity considered in the stiffness matrix of yarn. The periodic boundary conditions are developed for the off-axis loading simulations. The simulated stress–strain curves under on-axis uniaxial tension and compression show good agreements with experimental results. The influences of different 3D Hashin-type criteria are subsequently discussed. Moreover, the strength decrease at different off-axis angles and the failure envelopes under on-axis and 45° off-axis biaxial loadings are obtained, with the discussion of different failure characteristics under each loading condition.

Progressive damage analysis and strength prediction of 2D plain weave composites

Prediction of linear and non-linear behavior of 3D woven composite using mesoscopic voxel models reconstructed from X-ray micro-tomography

A coupled elastic-plastic damage model for the mechanical behavior of three-dimensional (3D) braided composites

Three-dimensional (3D) braided composites with high specific energy absorption behavior and excellent fatigue performances are widely used in structures under cycle or impact load. A comprehensive literature survey is conducted to review the numerical analysis methods of 3D braided composites, including meso-geometry modeling, mesh generation techniques, and progressive damage models. When the 3D braided composites are manufactured during a process cycle, the braid yarn can move and becomes a ‘deviated or imperfect’ architecture. Elaborate meso-geometrical models which directly influence the precision of numerical results can be established by different methods. Different mesh generation techniques of different numerical methods, which manage to discretize the complex geometry models, are provided. An analysis of various models involved in the prediction of damage development and failure of 3D braided composites by using finite element method is presented. This study highlights the importance of recognizi...

Qi Lu

Papers

Investigation on the compressive properties of the three dimensional four-directional braided composites