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Fatigue bearing failure of CFRP composite in biaxially loaded bolted joints at elevated temperature

机译：高温下双轴加载螺栓连接中CFRP复合材料的疲劳轴承失效

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Hybrid composite-aluminium structures develop internal loads when exposed to elevated temperatures, due to the different thermal expansion properties of the constituent materials. In aircraft structures with long rows of bolted joints, the mechanical and the thermally induced bolt loads are oriented in different directions, creating a biaxial bearing load state. In this study, the bearing fatigue failure process and the influence of the biaxial load state on the failure are investigated. An experimental set-up was designed, where both the mechanical and the thermally induced bolt loads were applied by means of mechanical load actuators. Two-bolt, double-lap joints with quasi-isotropic carbon-epoxy composite specimens were subjected to uniaxial and biaxial cyclic loading at 90 degrees C. A microscopy study of the bearing plane revealed that the main fatigue driving mechanisms were matrix cracking and fibre-matrix debonding. Motivated by these findings, a fatigue prediction model based on the kinetic theory of fracture for polymer matrices was run in a finite element code and the results showed a satisfactory correlation to the experimental results. The biaxial loading resulted in a longer fatigue life than the uniaxial loading, for the same peak resultant force, which was explained by the smaller effective stress range in the biaxial case. (C) 2015 Elsevier Ltd. All rights reserved.
机译：由于组成材料的热膨胀特性不同，混合铝复合结构在暴露于高温时会产生内部载荷。在具有长排螺栓连接的飞机结构中，机械和热感应螺栓载荷的方向不同，从而形成双轴轴承载荷状态。在这项研究中，研究了轴承疲劳失效过程以及双轴载荷状态对失效的影响。设计了一个实验装置，通过机械负载执行器同时施加机械和热感应螺栓负载。准各向同性碳-环氧复合材料试样的双螺栓双搭接接头在90摄氏度下承受单轴和双轴循环载荷。对轴承平面的显微镜研究表明，主要的疲劳驱动机制是基体开裂和纤维断裂。基质脱胶。基于这些发现，以有限元代码为基础，基于断裂动力学理论对聚合物基体进行了疲劳预测模型，结果与实验结果具有令人满意的相关性。对于相同的峰值合力，双轴载荷导致的疲劳寿命比单轴载荷更长，这可以用双轴情况下较小的有效应力范围来解释。 （C）2015 Elsevier Ltd.保留所有权利。

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