Study On The Progressive Damage Of Three-Dimensional Woven Composites In Latitudinal Shear

Compared with the classical two-dimensional laminate,the three-dimensional woven material has fiber bundle distributed in the plane and thickness direction,forming a specific spatial network structure,which has excellent impact resistance and high damage tolerance.Therefore,it is widely used in important fields such as aviation,aerospace,navigation,and automobile.With complex braiding structure and various component materials,three-dimensional woven materials have good designability,at the same time,it also increases the research difficulty of its damage mechanism.Firstly,the research background are introduced in detail,and the strength criterion and damage evolution model of 3D woven materials are reviewed.Secondly,the in-plane shear experiment under the quasi-static load was carried out,and the full-field displacement and strain on the surface of the specimen were collected by digital image correlation technology.The surface topography and internal damage process were obtained by optical microscopy and Shanghai synchrotron radiation technique.Finally,a full-scale custom finite element model of layered angular interlocking 3D woven materials is established by using finite polyphase element method.The position judgment module is programmed by user subroutine and the constitutive relation of materials is defined.The compositional differences of the three-dimensional woven materials are fully considered and the damage criteria are applied according to different failure modes(longitudinal fracture of the fiber bundle,transverse cracking between the fiber bundles and matrix cracking),and damage factors are introduced to characterize the damage status of the component materials.Finally,the shear strength and modulus of materials are predicted,which is in good agreement with the experimental results.