Mixed-Mode Decohesion Finite Elements for the Simulation of Delamination in Composite Materials
Mixed-Mode Decohesion Finite Elements for the Simulation of Delamination in Composite Materials
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发表时间：
2002-06
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通讯作者：
P. Camanho;C. Dávila
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作者：
P. Camanho;C. Dávila
摘要提出并论证了一种具有混合模式能力的消粘元件。该单元用来模拟脱层的起裂和非自相似扩展，在软化律中采用基于相对位移的单一损伤参数来跟踪界面的损伤状态，以防止在卸载过程中粘聚态的恢复。形成混合模分层传播的软化定律可以应用于任何模相互作用判据，如双参数幂定律或三参数Benzeggagh-Kenane判据。为了验证预测的准确性和本构关系的不可逆性，对不同类型的单模和混合型分层试件进行了准静态加载-卸载循环下的稳态分层扩展模拟。在许多层合复合材料系统中，引入层间损伤(分层)是主要的破坏形式之一，特别是在厚度方向没有增强时。冲击或制造缺陷引起的分层会导致结构的压缩承载能力显著降低。出现在几何不连续面附近的应力梯度，如*DEMEGI，Engenharia Faculdade de Engenharia，葡萄牙波尔图大学；客座科学家，力学与耐久性分部，NASA兰利研究中心，美国NASA兰利研究中心，t分析与计算方法分部，美国。
AbstractA new decohesion element with mixed-mode capability is proposed anddemonstrated. The element is used at the interface between solid finite ele-ments to model the initiation and non-self-similar growth of delaminations.A single relative displacement-based damage parameter is applied in a soft-ening law to track the damage state of the interface and to prevent therestoration of the cohesive state during unloading. The softening law formixed-mode delamination propagation can be applied to any mode interac-tion criterion such as the two-parameter power law or the three-parameterBenzeggagh-Kenane criterion. To demonstrate the accuracy of the predic-tions and the irreversibility capability of the constitutive law, steady-statedelamination growth is simulated for quasi-static loading-unloading cyclesof various single mode and mixed-mode delamination test specimens. 1 Introduction Interlaminar damage (delamination) is one of the predominant forms of failure inmany laminated composites systems, especially when there is no reinforcement inthe thickness direction. Delamination as a result of impact or a manufacturingdefect can cause a significant reduction in the compressive load-carrying capacityof a structure. The stress gradients that occur near geometric discontinuities such*DEMEGI, Faculdade de Engenharia, Universidade do Porto, Portugal; Visiting Scientist,Mechanics & Durability Branch, NASA Langley Research Center, U.S.A.tAnalytieal & Computational Methods Branch, NASA Langley Research Center, U.S.A.