湿热环境中复合材料层合圆柱薄壳的屈曲和后屈曲

沈惠申

湿热环境中复合材料层合圆柱薄壳的屈曲和后屈曲

沈惠申

上海交通大学建筑工程和力学学院, 上海 200030

基金项目: 国家自然科学基金资助项目(59975058)

详细信息

作者简介:
沈惠申(1947- ),浙江人,男,教授,博士,博导.

中图分类号: O343
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- 文章访问数: 2533
- HTML全文浏览量: 145
- PDF下载量: 791
- 被引次数: 0
出版历程
- 收稿日期: 1999-09-11
- 修回日期: 2000-08-29
- 刊出日期: 2001-03-15

Buckling and Postbuckling of Laminated Thin Cylindrical Shells under Hygrothermal Environments

SHEN Hui-shen

School of Civil Engineering and Mechanics, Shanghai Jiaotong University, Shanghai 200030, P R China

摘要

摘要: 在宏-细观力学模型框架下,讨论湿热环境对复合材料层合圆柱薄壳在轴向压缩作用下屈曲和后屈曲行为的影响.基于细观力学模型复合材料性能与湿度和温度变化有关.壳体控制方程基于经典层合壳理论,并包括湿热效应.壳体屈曲的边界层理论被推广用于湿热环境的情况,相应的奇异摄动法用于确定层合圆柱薄壳的屈曲荷载和后屈曲平衡路径.分析中同时计及壳体非线性前屈曲变形和初始几何缺陷的影响.数值算例给出完善和非完善正交铺设层合圆柱薄壳在不同湿热环境中的后屈曲行为.讨论了温度和湿度,纤维体积比率,壳体几何参数,铺层数,铺层方式和初始几何缺陷等各种参数变化的影响.
- 结构稳定性 /
- 后屈曲 /
- 湿热环境 /
- 层合圆柱壳 /
- 壳体屈曲的边界层理论 /
- 奇异摄动法
Abstract: The influence of hygrothermal effects on the buckling and postbuckling of composite laminated cylindrical shells subjected to axial compression is investigated using a micro-to-macro-mechanical analytical model.The material properties of the composite are affected by the variation of temperature and moisture,and are based on a micromechanical model of a laminate.The governing equations are based on the classical laminated shell theory,and including hygrothermal effects.The nonlinear prebuckling deformations and initial geometric imperfections of the shell were both taken into account.A boundary layer theory of shell buckling was extended to the case of laminated cylindrical shells under hygrothermal environments,and a singular perturbation technique was employed to determine buckling loads and postbuckling equilibrium paths.The numerical illustrations concern the postbuckling behavior of perfect and imperfect,cross-ply laminated cylindrical shells under different sets of environmental conditions.The influences played by temperature rise,the degree of moisture concentration,fiber volume fraction,shell geometric parameter,total number of plies,stacking sequences and initial geometric imperfections are studied.
- structural stability /
- postbuckling /
- hygrothermal environments /
- composite laminated cylindrical shell /
- a boundary layer theory of shell buckling /
- singular perturbation technique

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参考文献(15)

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