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首页> 外文期刊>International Journal of Solids and Structures >The effect of contact on the decohesion of laminated beams with multiple microcracks
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The effect of contact on the decohesion of laminated beams with multiple microcracks

机译：接触对具有多个微裂纹的层合梁解吸的影响

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摘要

The problem of interface decohesion in laminated beams is addressed with reference to the debonding double cantilever beam test geometry (DCB). The paper deals with the analysis of the influence of nonuniform bonding properties or interfacial defects on the crack propagation process and its stability. To this aim, the classical analytical approach based on the Euler-Bernoulli beam on an elastic foundation is extended to the presence of a general distribution of microcracks ahead of the macrocrack tip. The main features and limitations of this approach are carefully analyzed. In particular, it is shown that this simplified approach does not consider the unilateral contact condition along the interface, thus admitting a penetration between the two arms of the beam. A comparison with a finite element formulation is proposed to assess if this violation of the constraints inequalities, usually adopted in the case of uniform bonding, is still acceptable when interfacial defects are present. In order to fully describe the whole nonlinear behavior of the interface, a generalized interface constitutive law is used. The models comparison shows that, in the presence of interfacial defects, the effect of contact plays a crucial role in the description of the mechanical response of the joint. (C) 2007 Elsevier Ltd. All rights reserved.
机译：参照脱胶双悬臂梁测试几何形状（DCB）解决了层合梁中界面脱粘的问题。本文分析了不均匀的粘结性能或界面缺陷对裂纹扩展过程及其稳定性的影响。为此，基于弹性基础上的Euler-Bernoulli梁的经典分析方法被扩展为在大裂纹尖端之前存在微裂纹的一般分布。仔细分析了这种方法的主要特征和局限性。特别地，示出了这种简化的方法没有考虑沿界面的单侧接触条件，因此允许光束的两个臂之间的穿透。建议与有限元公式进行比较，以评估当存在界面缺陷时，这种违反约束不平等的现象（通常在均匀粘结的情况下采用）是否仍然可以接受。为了充分描述界面的整个非线性行为，使用了广义的界面本构律。模型比较表明，在存在界面缺陷的情况下，接触的影响在描述关节的机械响应中起着至关重要的作用。 （C）2007 Elsevier Ltd.保留所有权利。

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