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Instability of delaminated composite cylindrical shells under combined axial compression and bending

机译：分层复合圆柱壳在轴向压缩和弯曲作用下的不稳定性

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摘要

Composite cylindrical shells and panels are widely used in aerospace structures. These are often subjected to defects and damage from both in-service and manufacturing events. Delamination is the most important of these defects. This paper deals with the instability analysis of delaminated composite cylindrical shells subject to pure bending and also combined bending and axial compression, using the finite element method. The combined double-layer and single-layer of shell elements are employed, which in comparison with the three-dimensional finite elements requires less computing time and space for the same level of accuracy. The effect of contact in the buckling mode has been considered, by employing contact elements between the delaminated layers. The interactive buckling curves and postbuckling response of delaminated cylindrical shells have been obtained. In the analysis of post-buckled delaminations, a study using the virtual crack closure technique has been performed to find the distribution of the strain energy release rate along the delamination front. The results show that under pure bending, laminated cylindrical shells are more sensitive to the presence of delamination, than they are under pure axial compression. It was also observed that the effects of delamination are more apparent when the composite cylindrical shells are subjected to combined axial compression and bending. In this case, with a slight increase of the applied bending moment, the strain energy release rate distribution on the compressive side of the cylinder changes drastically.
机译：复合圆柱壳和面板广泛用于航空航天结构。这些经常在使用和制造事件中遭受缺陷和损坏。分层是这些缺陷中最重要的。本文采用有限元方法，对分层复合圆柱壳在纯弯曲作用下的不稳定性分析以及弯曲和轴向压缩相结合的问题进行了分析。采用了组合的双层和单层壳元素，与三维有限元相比，在相同精度级别上需要更少的计算时间和空间。通过在分层层之间采用接触元件，已经考虑了在弯曲模式下的接触效果。获得了层状圆柱壳的相互作用屈曲曲线和屈曲后响应。在屈曲后的分层分析中，已经进行了使用虚拟裂纹闭合技术的研究，以发现沿着分层前沿的应变能释放速率的分布。结果表明，与纯轴向压缩相比，在纯弯曲条件下，层合圆柱壳对分层的存在更敏感。还观察到，当复合圆柱壳经受组合的轴向压缩和弯曲时，分层的效果更加明显。在这种情况下，随着施加的弯矩的略微增加，气缸压缩侧的应变能释放速率分布急剧变化。

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