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受轴压黏弹性层合圆柱壳的极值点蠕变失稳

, PP. 166-172

Keywords: 黏弹性,层合圆柱壳,极值点,延迟失稳,缺陷敏感性

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Abstract:

基于Donnell薄壳理论,采用准弹性方法,分析了含初始几何缺陷黏弹性层合圆柱壳极值点形式的延迟失稳特征。由轴向缩短量的突然增加定义失稳临界时间,对玻璃纤维/环氧树脂层合圆柱壳进行了数值计算。结果表明:圆柱壳存在临界时间趋于无穷的持久临界荷载;表征延迟失稳程度的瞬时弹性临界荷载与持久临界荷载之差值随着初始几何缺陷的增加而减小;边界条件、铺设方式对延迟失稳的影响机制可通过对应弹性层合圆柱壳的缺陷敏感性分析来考察。

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