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Numerical failure assessment of multi-bolt FRP composite joints with varying sizes and preloads of bolts

机译：螺栓尺寸和预紧力不同的多螺栓FRP复合节点的数值失效评估

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摘要

A three dimensional (3D) progressive damage model (PDM) is developed for the failure assessment of fibre reinforced plastic (FRP) composite bolted joints subjected to bolt preloads. Material constitutive equations and material damage model are defined in a user-subroutine UMAT which is integrated with the finite element (FE) software ABAQUS. Fibre and matrix failure in tension, compression or in shear along with delamination failure criteria are incorporated in the present numerical model. Load-displacement behavior, laminate surface strains, propagation of damage and failure of a double-lap multi-bolt composite joint have been studied and present results are validated with the results available in literature. Failure of double-lap multi-bolt FRP joints with different bolt diameters and bolt tightening torques have been investigated using the proposed progressive damage model.
机译：建立了三维（3D）渐进式损伤模型（PDM），用于评估纤维增强塑料（FRP）复合材料螺栓连接在螺栓预紧力作用下的失效。在用户子程序UMAT中定义了材料本构方程和材料损坏模型，该子程序与有限元（FE）软件ABAQUS集成在一起。纤维和基体在拉伸，压缩或剪切中的破坏以及分层破坏准则被纳入本数值模型中。已经研究了载荷-位移行为，层压板表面应变，双搭接多螺栓复合接头的损伤传播和破坏，并用文献中的结果验证了目前的结果。使用建议的渐进式损伤模型研究了具有不同螺栓直径和螺栓拧紧扭矩的双搭接多螺栓FRP接头的失效。

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