DYNAMIC PROGRESSIVE FAILURE ANALYSIS METHOD FOR COMPOSITE MULTI-SCALE MODEL

摘要

For a mechanical response and progressive damage behavior generated by a composite laminate structure under dynamic working conditions, firstly, taking the different mechanical behaviors of a fiber and a matrix in a microscopic state into consideration, a three-dimensional multi-scale dynamic progressive damage evolution law model based on a microscopic failure theory is provided, and on the basis of micro-component degeneration elasticity parameters in a typical representative volume element model, a new damage evolution law model of the fiber and the resin matrix and an auxiliary deletion criterion of a failure element are provided; and secondly, a stress amplification coefficient is used for establishing a model for relationships between macro stress in a composite model and micro stress in a representative volume element, and intralaminar and interlaminar damage behaviors of a composite under the cutting action of a dagger drill are simulated in conjunction with a bilinear cohesive element model.