STOCHASTIC FINITE ELEMENTS ANALYSIS OF LAMINATED SHELLS
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摘要: 为研究复合材料壳体的某些随机性, 本文考虑了复合材料壳体的层角、层厚和材料常数的随机性。针对这一具体情况, 对应力-应变阵、刚阵和位移矢量等进行了台劳展开, 取其二次近似式, 应用二次摄动法, 求出响应的确定解、一次感度和二次感度, 然后由统计理论及可靠性理论, 求出响应的期望、方差、变异系数和可靠度等。以实现复合材料壳体的概率有限元分析。Abstract: In order to study some stochastic character problems of the composite laminated shell, the author has considered the stochastic characters including the ply angle, ply thickness and material constant, and in Taylor series, the expansions in Taylor series for stress-strain matrix, stiffiness matrix and displacement vector have been employed. Taking from their quadric approximate formulae, the definite solution, primary sensitivity and secondary sensitivity of the response are obtained by means of the quadric perturbation scheme. Then according to the statistical theory and reliability theory, the expected value, variance, coefficient of variation and reliability are given, so as to realize the stochastic finite element analysis of laminate shells.
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Key words:
- stochastic finite element /
- composite material /
- laminate shell /
- reliability
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