Dynamic Progressive Failure Analysis Method For Composite Multi-Scale Model

A dynamic progressive failure analysis method based on multi-scale model of composite material is proposed as follows:

• In the first step, ignoring the initial damage of composite laminates in the process of fabrication, the composite is idealized as the superposition of the preset stacking sequence of unidirectional laminates, and the macro structure of the composite is analyzed, considering the influence of macro structure design, material properties, stacking method and loading form of the whole structure on the internal stress and strain distribution of the structure;
• In the second step, according to the mechanical analysis of unidirectional laminates, the fiber distribution of unidirectional laminates is reasonably simplified;
• Based on the fiber volume fraction, a representative volume element of micromechanics oriented to the apparent mechanical properties of composite structures is established, and the multi-scale analysis method is used to transfer the load of macro structural elements or integral points to the micro model, Under this load, the stress distribution of each element integral point of fiber and matrix component material is simulated;
• In addition, the micro failure theory is used to judge the failure of the matrix and fiber respectively;
• Assuming that each corresponding element is damaged, the stiffness of the damaged element is reduced and the failure element is deleted until it is deleted;
• If the element is not deleted, the whole cell model is homogenized to obtain the macro mechanical properties of the damaged material;
• In the third step, the macro properties of the damaged material are assigned to the corresponding elements in the macro structure, and then the macro analysis of the whole structure is carried out in the next step, which is repeated until the set time analysis step is completed;
• Finally, the multi-scale numerical simulation analysis of the composite material from the component to the structure under the cutting action of the cutting tool is realized.