CSM玻璃钢复合型断裂的有限元分析
FEM Analysis on Mixed-Mode Fracture of CSM-GRP
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摘要: 对切短玻璃纤维毡增强聚脂层板的复合型断裂进行了有限元分析。采用八节点四边形等参元的正规型式计算应力分布与损伤区扩展;而用坍塌(collapsed)三角形四分之一点(quarter-point)奇异元计算应力强度因子KⅠ与KⅡ。用节点位移约束与释放技术计算了裂纹扩展过程。对决定应力强度因子KⅠ与KⅡ的三种方法进行了对比。对施加于裂纹顶点节点约束条件的影响进行了评价。最后基于实验测得的断裂载荷与临界裂纹长度,估算了材料在这种受力条件下的复合型临界应力强度因子KⅠC和KⅡC。Abstract: An FEM analysis for studying mized-mode fracture problem of chopped strand mat glass fibre reinforced polyester laminate was presented, The analysis was formulated on the basis of 8-node quadrilateral isoparametric element, The collapsed triangular quarter-point singular elements were used for calculating stress intensity factors KⅠ and KⅡ. The crank propagation process was computed by implementing constraint release technique, Three different approaches to the solution of stress intensity factors KⅠ and KⅡ were compared, The effect of constraint condition imposed upon the displacement of the three collapsed nodes of the crack tip elements on the KⅠ and KⅡ results was evaluated, The mixed-mode critical stiress intensity factors KⅠC and KⅡC were estimated for CSM-GRP through the consideration of KⅠ and KⅡ calculated and the measured failure load and critical crack length in the experiment.
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