复合材料层合板首末层失效强度的预测方法研究
李成刚
（中国东方航空工程技术公司 四川维修部，四川 成都 610225）
摘要：建立复合材料的三维有限元模型，该模型能有效计算自由边界区的应力以及层间应力，与二维模型相比提高了求解精度；采用Tsai-Wu张量理论作为单元失效的判断依据，引入安全系数计算首层失效，然后使用增量法求解复合材料最终失效强度，使得求解速度加快的同时又不影响求解精度；使用正交实验方法研究不同刚度缩减系数（SCR）对首末层失效强度的影响，发现在进行渐进失效分析时，有限元模型是否合理应该根据首层失效强度与实验值进行比较，不能只考虑最终失效强度与实验值的差异。
关键词：复合材料；渐进失效分析；正交实验；刚度缩减系数
中图分类号：TB303 文献标识码：A 文章编号：1006－0316 (2012) 03－0048－07
Predict method for first ply and ultimate failure strength of composite laminates
LI Cheng-gang
( Sichuan Maintenance Department, China Eastern Airlines Engineering Technology,
Chengdu 610225, China )
Chengdu 610225, China )
Abstract：a three-dimensional finite element model for solve composite laminates progress failure was established, which can calculate the stress at free boundary zones and the stress between layers, so its solution accuracy is higher than the two-dimensional model; Tsai-Wu tensor theory was used to determine elements failure. Safety factor was used to calculate the first ply failure and incremental method was used to calculate ultimate failure. this model can solve first ply and ultimate failure efficiently and accurately; the orthogonal experimental method was used to examine different coefficient of stiffness reduction (SCR) impact on first ply and ultimate failure strength. The results found that reasonability of finite element model should compare first ply failure strength with experimental data, it is inappropriate that just compare the ultimate failure strength with the experimental data.
Key words：composite materials；progress failure；orthogonal experimental method；coefficient of stiffness reduction
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收稿日期：2011－10－19
作者简介：李成刚（1984－），男，四川隆昌人，助理工程师，本科，主要从事航空发动机材料及其疲劳强度设计工作。
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