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首页> 外文期刊>Computer Methods in Applied Mechanics and Engineering >Are the cohesive zone models necessary for delamination analysis?
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Are the cohesive zone models necessary for delamination analysis?

机译：分层分析是否需要粘聚区模型？

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摘要

We develop a dual-purpose damage model (DPDM) that can simultaneously model intralayer damage (ply failure) and interlayer damage (delamination) as an alternative to conventional practices that models ply failure by continuum damage mechanics (CDM) and delamination by cohesive elements. From purely computational point of view, if successful, the proposed approach will significantly reduce computational cost by eliminating the need for having double nodes at ply interfaces. At the core, DPDM is based on the regularized continuum damage mechanics approach with vectorial representation of damage and ellipsoidal damage surface. Shear correction factors are introduced to match the mixed mode fracture toughness of an analytical cohesive zone model. A predictor-corrector local-nonlocal regularization scheme, which treats intralayer portion of damage as nonlocal and interlayer damage as local, is developed and verified. Two variants of the DPDM are studied: a single- and two-scale DPDM. For the two scale DPDM, reduced-order-homogenization (ROH) framework is employed with matrix phase modeled by the DPDP while the inclusion phase modeled by the CDM. The proposed DPDM is verified on several multi-layer laminates with various ply orientations including double-cantilever beam (DCB), end-notch-flexure (ENF), mixed-mode-bending (MMB), and three-point bending (TPB). (C) 2016 Elsevier B.V. All rights reserved.
机译：我们开发了一种双用途损伤模型（DPDM），它可以同时对层内损伤（层破坏）和层间损伤（分层）进行建模，以替代常规做法，该常规做法是通过连续损伤力学（CDM）对层破坏进行建模，并通过内聚元素进行分层。从纯粹的计算角度来看，如果成功，则所提出的方法将消除在层接口上具有双节点的需要，从而显着降低计算成本。 DPDM的核心是基于规则化的连续损伤力学方法，该方法具有损伤和椭圆形损伤表面的矢量表示。引入剪切校正因子以匹配分析内聚区模型的混合模式断裂韧性。开发并验证了预测器-校正器局部-非局部正则化方案，该方案将损坏的层内部分视为非本地并将层间损坏视为本地。研究了DPDM的两个变体：单比例和二比例DPDM。对于两级DPDM，采用降阶均质化（ROH）框架，其中DPDP建模的矩阵相位，而CDM建模的包含相位。所提议的DPDM已在具有多种层取向的多层多层层压板上得到验证，包括双悬臂梁（DCB），端部弯曲挠度（ENF），混合模式弯曲（MMB）和三点弯曲（TPB） 。 （C）2016 Elsevier B.V.保留所有权利。

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