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首页> 外文期刊>Composite Structures >Critical strain for a locally elliptical delamination near the surface of a cylindrical laminated shell under hydrothermal effects
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Critical strain for a locally elliptical delamination near the surface of a cylindrical laminated shell under hydrothermal effects

机译：在水热作用下圆柱形叠层壳表面附近的局部椭圆形分层的临界应变

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摘要

An analytical method is presented to investigate hydrothermal effects on locally buckling for an elliptical delamination near the surface of cylindrical laminated shells. The critical strain of non-linear buckling for a locally elliptic delamination of cylindrical laminated shells is obtained by considering transverse displacements of the elliptically sub-laminated shells. The stacking sequence of sub-laminated shells may be multilayer and asymmetric. The geometrical axis of sub-laminated shells may be arbitrary. The Young's modulus and the thermal and humidity expansion coefficients of the material are considered as functions of temperature change in base-laminated shells. The critical strains of locally buckling for cylindrical laminated shells subjected to hydrothermal effects are extracted for different stacking sequences, and different radii of base-laminated shells, by applying Rayleigh-Ritz method based on second variation of potential energy. From results carried out, it is found that the critical strain from the non-linear buckling for a locally elliptic delamination near the surface of a cylindrical laminated shell presents a lower value than that from linear considerations.
机译：提出了一种分析方法来研究水热效应对圆柱形层压壳表面附近的椭圆分层的局部屈曲的影响。通过考虑椭圆形亚层合壳的横向位移，获得了圆柱形层合壳局部椭圆分层的非线性屈曲的临界应变。次层压壳的堆叠顺序可以是多层且不对称的。分层压壳的几何轴可以是任意的。材料的杨氏模量以及热和湿度膨胀系数被认为是基底层压壳中温度变化的函数。通过基于势能二次变化的瑞利-里兹方法，针对不同的堆积顺序和不同的基底层合壳半径，提取了承受水热效应的圆柱形层合壳局部屈曲的临界应变。从进行的结果中发现，对于圆柱形叠层壳的表面附近的局部椭圆形分层，非线性屈曲的临界应变呈现出比线性考虑更低的值。

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