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- Title
基于扩展二相杂交应力有限元法的两相材料 界面裂纹断裂力学分析.
- Authors
江海涛; 李欢; 杨文彩
- Abstract
In the practical application process, due to the different properties of the materials on both sides of the composite interface and the defects in the manufacturing process, under the action of external load, a large number of initial microcracks are generated at the interface, which then expand and intersect to form macrocracks and finally expand and penetrate, resulting in structural failure. Therefore, the analysis of interfacial cracks is very important for optimizing composite materials and improving their application performance and reliability. An extended two-phase hybrid stress finite element method was proposed. The fracture mechanics analysis of interface cracks was carried out by constructing an extended two-phase hybrid stress finite element model of two-phase materials including boundary cracks, horizontal center cracks and inclined cracks. The Lagrange multiplier method was used to introduce the zero boundary condition of the surface force of each interface crack and the continuous condition of the surface force of the unbroken interface into the modified complementary energy functional. The high-order polynomial stress function was assumed in each phase material domain, and the influence of the interface shape was fully considered. The interaction stress function was constructed, and the singular stress field function near the crack tip of the bimaterial interface crack was introduced. The element stress field was obtained based on Fortran program, and the stress intensity factor of interface crack was calculated by least square method. The numerical simulation results obtained by this method are compared with the numerical results of traditional finite element analysis to verify the effectiveness and accuracy of the method.
- Publication
Science Technology & Engineering, 2023, Vol 23, Issue 35, p14923
- ISSN
1671-1815
- Publication type
Article