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首页> 外文期刊>Composite Structures >Analysis of debonding fracture in a sandwich pate with hexagonal core
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Analysis of debonding fracture in a sandwich pate with hexagonal core

机译：六边形夹心夹层的剥离断裂分析。

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摘要

In lightweight applications (as, e.g., aerospace structures) sandwich constructors are very useful and common due to their superior specific bending stiffness and bending strength. In many cases the sandwich consists of an upper and lower laminate facetted and an intermediate hexagonal cellular aluminum core. Along their interfaces the facesheets and the core are glued together. In order to ensure structural integrity, the facetted/core bonding is of particualr interest. Finite element method has been sued to study the cause and the effects of debonding phenomena in between the facesheet and the core of a sandwich plate under in plane loading A "unit cell" approach has been followed throughout the study. It has been observed that under an applied in-plane loading, there is a significant stress concentration at the junction of three cell walls and facetted which easily leads to the generation of cracks and their growth. In order to judge about the tendency of crack initiation and growth, hypothetical interface cracks have been considered and analyzed by fracture mechanics technique. In doing so for various crack length, the energy release rate has been calculated and assessed by means of Irwin's crack closure integral for a number of different situations. It has been observed that there is a significant amount of energy relapse rate even in the case of a very small or virtually no crack. This phenomenon indicts that the gule used to attach the facesheet and the cell must withstand a non-zero energy release rate even in the inact situation without any debonding.
机译：在轻质应用中（例如，航空航天结构），夹层构造器由于其优异的比弯曲刚度和弯曲强度而非常有用且通用。在许多情况下，三明治由上，下两面的层压板和一个中间的六角形蜂窝状铝芯组成。面板和核心沿着它们的界面粘合在一起。为了确保结构完整性，多面/芯粘结特别令人关注。在平面载荷作用下，已经使用有限元方法研究了夹层板的面板和内芯之间的剥离现象的原因和影响。在整个研究过程中，一直采用“单位单元”方法。已经观察到，在施加面内载荷的情况下，三个单元壁和小平面的交界处存在明显的应力集中，这很容易导致裂纹的产生和扩展。为了判断裂纹萌生和扩展的趋势，已经考虑了假设的界面裂纹，并通过断裂力学技术对其进行了分析。在各种裂纹长度下，能量释放率已通过Irwin的裂纹闭合积分计算和评估，适用于多种不同情况。已经观察到，即使在非常小的裂纹或几乎没有裂纹的情况下，也存在大量的能量回波率。这种现象表明，即使在不使用任何胶粘剂的情况下，用于固定面板和电池的胶粘剂也必须承受非零的能量释放速率。

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