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Investigation of bolt load redistribution and its effect on failure prediction in double-lap, multi-bolt composite joints

机译：双搭接，多螺栓复合节的螺栓载荷重分布及其对失效预测的影响

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摘要

A test method was presented to measure the bolt load distribution in the progressive damage process of multi-bolt composite joints, which exhibits continuous changes with the damage propagation in composite laminates. Based on the repeated loading-unloading cycles, bolt shear loads of a double-lap, three-bolt joint were tested by alternately using modified instrumented bolt-nut pairs and aircraft-grade fasteners, from which the bolt load redistribution history was achieved. In addition, a progressive damage method was adopted to trace the load redistribution history of the joint. The numerical predictions were in good agreement with the experimental outcomes, both of which show that the load distribution tended toward equal proportions before the final failure of the joint. Using a modified failure envelope method, the failures of two-, three- and four-bolt composite joints were predicted based on the uniform load distribution and actual load distribution, and compared with that based on the traditional load distribution calculated by a traditional stiffness method (TSM). It follows that the effect of the actual load distribution on the failure of the multi-bolt joints can be more faithfully reflected by adopting a uniform load distribution than by the traditional one.
机译：提出了一种在多螺栓复合材料节点渐进式破坏过程中测量螺栓载荷分布的测试方法，该方法随着复合材料层合中的破坏传播而不断变化。基于反复的装卸循环，通过交替使用改良的仪表螺栓螺母对和飞机级紧固件来测试双圈三螺栓接头的螺栓剪切载荷，从而获得了螺栓载荷的重新分布历史。此外，采用渐进式损伤方法来跟踪关节的载荷重新分布历史。数值预测与实验结果非常吻合，这两个结果都表明，在接头最终失效之前，载荷分布趋于相等。使用改进的破坏包络法，基于均匀载荷分布和实际载荷分布，预测了两螺栓，三螺栓和四螺栓复合节点的失效，并与基于传统刚度方法计算的传统载荷分布进行了比较。 （TSM）。因此，与传统的方法相比，采用均匀的载荷分布可以更真实地反映实际载荷分布对多螺栓接头失效的影响。

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