Modelling bearing failure in countersunk composite joints under quasi-static loading using 3D explicit finite element analysis
Modelling bearing failure in countersunk composite joints under quasi-static loading using 3D explicit finite element analysis
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DOI：
10.1016/j.compstruct.2013.10.033
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发表时间：
2014-02-01
影响因子：
6.3
通讯作者：
McCarthy, C. T.
中科院分区：
文献类型：
--
作者：
Egan, B.;McCarthy, M. A.;McCarthy, C. T.
三维显式有限元建模用于预测典型沉头复合材料机身蒙皮接头的准静态承载响应。为了准确模拟轴承失效，为 Abaqus/Explicit 制定了用户定义的 3D 复合损伤模型，其中包括 Puck 失效准则、非线性剪切定律和裂纹带模型，以减轻网格敏感性。我们开发了一种新颖的方法来采用特征单元长度，该长度可以解释 Abaqus/Explicit 求解器中复合材料层裂纹的方向。由此产生的模型准确地预测了初始接头粘滞行为以及单螺栓和三螺栓接头的弹性载荷响应，但对轴承失效发生的初步预测过于保守。通过利用压缩纤维失效的断裂能来获得改进的失效预测，这被认为与模拟轴承损坏更相关。显式模型异常稳健，显示出预测大范围孔破碎的能力。重点介绍了显着提高联合模型效率的方法。 (C) 2013 Elsevier Ltd. 保留所有权利。
Three-dimensional explicit finite element modelling is used to predict the quasi-static bearing response of typical countersunk composite fuselage skin joints. In order to accurately simulate bearing failure, a user-defined 3D composite damage model was formulated for Abaqus/Explicit and included Puck failure criteria, a nonlinear shear law and a crack band model to mitigate mesh sensitivity. A novel approach was developed to employ characteristic element lengths which account for the orientation of composite ply cracks in the Abaqus/Explicit solver. Resulting models accurately predicted initial joint sticking behaviour and the elastic loading response of single-bolt and three-bolt joints, but preliminary predictions of bearing failure onset were overly-conservative. Improved failure predictions were obtained by utilising a fracture energy for compressive fibre failure which was considered more relevant for simulating bearing damage. The explicit models were exceptionally robust, showing capability to predict extensive hole crushing. Methods of dramatically improving joint model efficiency were highlighted. (C) 2013 Elsevier Ltd. All rights reserved.