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A modified cohesive zone model for fatigue delamination in adhesive joints: Numerical and experimental investigations

机译：粘性关节疲劳分层改进的凝聚区模型：数值和实验研究

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摘要

A modified cohesive zone model (CZM) has been developed to simulate damage initiation and evolution in Fibre-Metal Laminates (FMLs) manufactured in-house but based on the Glare (R) material specifications. Specimens containing both splice and doubler features were analysed under high cycle fatigue loading. The model uses a novel trapezoidal traction-separation law to describe the elastic-plastic behaviour of this material under monotonic and high-cycle fatigue loading. The model is implemented in the software Abaqus/Explicit via an user-defined cohesive material subroutine. Several models of increasing complexity were investigated to validate the proposed approach. A two-stage experimental testing programme was then conducted to validate the numerical analyses. Firstly, quasi-static tests were used to determine the ultimate tensile strength (UTS) of a series of specimens with and without internal features. Secondly, high-cycle fatigue tests were conducted on both laminate types with variable load amplitude so that S-N curves could be built. Tests were monitored using digital image correlation (DIC) for full-field strain mapping and acoustic emission (AE) sensing to detect the initiation and propagation of damage during quasi-static and fatigue tests. Good correlation was observed between predicted onset and growth of delaminations and the history of cumulative AE energy during the tests, which supports the validity of the cohesive modelling approach for FMLs.
机译：已经开发了一种改进的凝聚区模型（CZM）以模拟内部制造的纤维金属层压板（FMLS）的损伤启动和演化，但基于眩光（R）材料规格。在高循环疲劳载荷下分析含有拼接和倍增器特征的样品。该模型采用了一种新颖的梯形牵引 - 分离法来描述单调和高循环疲劳负载下该材料的弹性塑性行为。该模型通过用户定义的凝聚性材料子程序在ABAQUS /简明中实现。调查了一些增加复杂性的模型，以验证提出的方法。然后进行两阶段实验测试程序以验证数值分析。首先，准静态试验用于确定一系列具有和无内部特征的样本的最终拉伸强度（UTS）。其次，在具有可变载荷幅度的两个层压类型上进行高循环疲劳试验，从而可以构建S-N曲线。使用数字图像相关（DIC）来监测测试，用于全场应变映射和声学发射（AE）感测，以检测准静态和疲劳测试期间损坏的启动和传播。在测试期间预测发作和分层的累积历史和累积AE能量历史之间观察到良好的相关性，这支持FMLS的凝聚力建模方法的有效性。

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