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首页> 外文期刊>Composite Structures >Development of two intrinsic cohesive zone models for progressive interfacial cracking of laminated composites with matching and non- matching cohesive elements
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Development of two intrinsic cohesive zone models for progressive interfacial cracking of laminated composites with matching and non- matching cohesive elements

机译：开发两个固有的内聚区模型，用于具有匹配和不匹配内聚元素的层状复合材料的渐进界面开裂

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摘要

In recent decades, intrinsic cohesive zone models (CZMs) have proved to be an effective approach to modeling progressive interfacial cracking of laminated composite structures. However, matching cohesive interface elements are usually required, which imposes constraints on finite element mesh discretization and reduces computational efficiency for interfacial cracking analysis in bi-material structures with a large modulus mismatch. To address this issue, we develop two intrinsic CZMs, i.e. node- and facet-based models, allowing interfacial cracking modeling with both matching and non-matching cohesive elements in a unified way. Prior to cracking simulations, node and facet cohesive pairs can be easily constructed by recourse to contact detection algorithms. During cracking, cohesive forces of such two models are evaluated in pointwise and integral ways, respectively. The developed models are then respectively coupled with tributary node-to-segment and mortar algorithms to account for a smooth transition from cohesive failure to unilateral contact. Several representative numerical examples are performed to validate the effectiveness of the proposed models, where the numerical performance is also compared and discussed.
机译：在最近的几十年中，固有的内聚区模型（CZMs）已被证明是对层压复合结构的渐进界面开裂进行建模的有效方法。但是，通常需要匹配的粘性界面元素，这对有限元网格离散化施加了约束，并降低了模量不匹配大的双材料结构中界面裂纹分析的计算效率。为了解决这个问题，我们开发了两个固有的CZM，即基于节点和构面的模型，允许以统一的方式使用匹配和不匹配的内聚元素进行界面裂纹建模。在进行裂纹模拟之前，可以通过求助于接触检测算法来轻松构建节点和构面内聚对。在开裂期间，分别以点状和积分方式评估这两个模型的内聚力。然后，将开发的模型分别与支流节点到网段和砂浆算法结合，以说明从内聚破坏到单边接触的平稳过渡。进行了几个有代表性的数值示例，以验证所提出模型的有效性，其中还对数值性能进行了比较和讨论。

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