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首页> 外文期刊>Journal of aerospace engineering >Quasi-Three-Dimensional Crack Tip Element Analysis for Evaluation of Total Energy Release Rate in Composite Laminates
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Quasi-Three-Dimensional Crack Tip Element Analysis for Evaluation of Total Energy Release Rate in Composite Laminates

机译：评估复合材料层合板总能量释放率的准三维裂纹尖端单元分析

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摘要

An analytical quasi-three-dimensional crack tip element model is developed to provide a quick assessment of the delamination behavior for composite laminates. A closed-form solution for the average total strain energy release rate is obtained by taking into consideration of all the displacement components defined in the classical laminated plate theory. By means of numerical experiments, it is shown that the presented method can predict the average total strain energy release rates with satisfactory accuracy for a relatively large variety of composite layups under opening and in-plane-shearing loading conditions. It indicates that the influence of out-of-plane transverse displacements on the total energy release rate can be significant for certain type of layups even under in-plane loading conditions. Furthermore, an orthotropic parameter is introduced to represent the influence of out-of-plane transverse effects.
机译：分析准三维裂纹尖端元素模型被开发来提供快速评估复合材料层压板的脱层行为。通过考虑经典层压板理论中定义的所有位移分量，可获得平均总应变能释放率的封闭形式解。通过数值实验表明，对于在开放和面内剪切载荷条件下相对大量的复合材料铺层来说，所提出的方法能够以令人满意的精度预测平均总应变能释放速率。这表明，即使在平面内载荷条件下，平面外横向位移对总能量释放速率的影响对于某些类型的叠层也可能是显着的。此外，引入正交各向异性参数来表示平面外横向效应的影响。

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