Cohesive element formulation for z-pin delamination bridging in fibre reinforced laminates
Cohesive element formulation for z-pin delamination bridging in fibre reinforced laminates
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DOI：
10.1016/j.ijsolstr.2017.05.037
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发表时间：
2018-02
影响因子：
3.6
通讯作者：
G. Mohamed;G. Allegri;M. Yasaee;S. Hallett
中科院分区：
文献类型：
--
作者：
G. Mohamed;G. Allegri;M. Yasaee;S. Hallett
Z销是一种有效的增强复合材料层合板以抵抗分层扩展的方法。本文提出了一种新的数值方法，将经典的粘结有限元方法与半解析的z-pin裂纹桥接模型相结合，在宏观有限元模型中引入了特殊用途的粘结单元，其中广义的力-位移特性由半解析模型的z-pin桥接图提供。该内聚元素提供了灵活性，采用两个内聚法同时预测脱层传播，无论是钉扎和unpinned行为。通过模拟2% z-pin面密度下的双悬臂梁（DCB）、混合模式弯曲（MMB）和纯模式II端部加载劈裂（ELS）断裂试验来评估其功效。计算结果与试验结果吻合较好。不同的模拟都是使用来自单z引脚测试的单组输入参数进行的，没有拟合因子。
Z-pins are an effective method of reinforcing laminated composite materials for resisting the propagation of delamination. In this paper, a novel numerical method combines the classical cohesive finite element (FE) method with a semi-analytical z-pin crack bridging model.Special purpose cohesive elements, in which the generalized traction-displacement characteristics are provided by the semi-analytical model z-pin bridging map, are implemented in macro-scale FE models. This cohesive element offers the flexibility to employ two cohesive laws concurrently for prediction of delamination propagation, for both the pinned and unpinned behaviour. Its efficacy is evaluated by the simulation of double cantilever beam (DCB), mixed-mode bend (MMB), and pure mode II End-Loaded Split (ELS) fracture tests at 2% z-pin areal density. The numerical results in terms of load-deflection predictions agree well with experiments. The different simulations were all performed using a single set of input parameters derived from single z-pin tests with no fitting factors.