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针对多钉连接中因复合材料脆性等因素导致结构中的钉载分配不均匀,以及接头在承载较大的钉位置易发生过早破坏的问题,提出了调整钉孔配合间隙改善钉载分配的不均匀性的优化方法。首先,基于弹簧质量模型,以钉孔间隙为设计变量,建立了多钉连接钉载分配的二次规划优化模型。然后,采用内点法对优化模型进行了求解,得到了优化模型的全局最优解。最后,以复合材料5钉双剪接头为例,对钉孔间隙进行了优化,将计算结果与有限元预测结果进行对比。结果表明:模型优化结果与有限元结果吻合较好,优化后最大钉载比例由41.1%降低到了20%。采用该模型可以高效、准确地实现复合材料多钉连接钉载分配比例的均匀化设计。
Aiming at the problem of non-uniform distribution of the stubs in the structure caused by the brittleness of the composite materials and the premature failure of the stubs in the location of the larger nails, Unevenness optimization method. First, based on the spring mass model, the nail hole clearance is taken as the design variable to establish the quadratic programming optimization model of multi-nail connection nail load distribution. Then, by using the interior point method, the optimization model is solved and the global optimal solution of the optimization model is obtained. Finally, the 5-nailed double-spliced joint of composite material is taken as an example to optimize the nail hole clearance. The calculated results are compared with the finite element prediction results. The results show that the model optimization results are in good agreement with the finite element results, and the optimized maximum load ratio is reduced from 41.1% to 20%. The model can be used to efficiently and accurately design the uniform distribution of the ratio of the staples in the multi-splicing of composite materials.