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首页> 外文期刊>Applied Mathematical Modelling >The role of transverse stretching in the delamination fracture of softcore sandwich plates
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The role of transverse stretching in the delamination fracture of softcore sandwich plates

机译：横向拉伸在软芯夹芯板分层断裂中的作用

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This paper presents the semi-layerwise analysis of structural sandwich plates with through-width delamination. The mechanical model of rectangular plates is based on the method of four equivalent single layers and the system of exact kinematic conditions. An important improvement compared to a previous formulation is the consideration of linear and quadratic stretching term in the transverse displacement component. Three different delamination scenarios are investigated: core-core failure, face-core delamination and the face-face failure. By applying the first- and second-order laminated plate theories and the principle of virtual work the governing equations are derived. The equilibrium equations are solved under Levy type boundary conditions using the state-space approach. Solutions for the mechanical fields are provided and compared to 3D finite element results. The energy release rate distributions along the delamination front are also determined using the J-integral. Although the stress resultants by transverse stretching do not influence directly the J-integral, the results indicate that this effect improves the accuracy of the model in general, and substantially influences the results of the first-order plate theory in the case of the face-face delamination. (C) 2018 Elsevier Inc. All rights reserved.
机译：本文介绍了具有全宽度分层的结构夹层板的半层分析。矩形板的力学模型基于四个等效单层的方法和精确的运动学条件系统。与以前的公式相比，一个重要的改进是在横向位移分量中考虑了线性和二次拉伸项。研究了三种不同的分层方案：核心-核心故障，面-核心分层和面-面故障。通过应用一阶和二阶叠层板理论以及虚功原理，推导了控制方程。使用状态空间方法在Levy型边界条件下求解平衡方程。提供了机械场的解决方案，并将其与3D有限元结果进行了比较。沿着分层前沿的能量释放速率分布也使用J积分确定。尽管横向拉伸产生的应力不会直接影响J积分，但结果表明，这种效果通常会提高模型的精度，并且在面对面的情况下会大大影响一阶板理论的结果。面对分层。 （C）2018 Elsevier Inc.保留所有权利。

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