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复合材料层合板临界屈曲载荷分散性

, PP. 194-200

Keywords: 复合材料层合板,临界屈曲载荷,分散性,随机场,Monte-Carlo模拟

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Abstract:

基于随机场理论,将纤维和基体性能以及纤维体积分数作为随机场变量,利用局部平均法对随机场进行离散。结合MATLAB与ANSYS的PDS模块对复合材料层合板临界屈曲载荷进行Monte-Carlo模拟,分析各类随机场变量、随机场的相关长度、对称性和边界条件对临界屈曲载荷分散性的影响。结果表明:不同随机场变量对层合板屈曲载荷分散系数影响的程度不同,纤维体积分数的影响最大,其次为纤维性能与基体性能;屈曲载荷的分散系数存在尺寸效应,随着板尺寸的增加,屈曲载荷分散系数逐渐减小;减小相关长度可有效地减小屈曲载荷的分散系数;纤维正对称铺设所引起的屈曲载荷分散系数稍大于反对称铺设情况,而两对边固支板的屈曲载荷分散系数一般大于四边简支板的结果。

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