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复合材料螺接修理具有操作简便,对连接件表面处理的要求不高,施工快速、性能可靠等优点,在复合材料的临时修理、尤其是战伤修理中应用较为广泛。然而其修理设计过程较为复杂,难以满足工程快速定参的需要。在螺接接头弹簧质量模型的基础上,针对蒙皮和补片等宽的情况,提出了一种复合材料螺接修理结构载荷传递比例计算方法。通过引入载荷按刚度分配的原则对模型进行修正,将模型进一步推广到蒙皮宽度大于补片宽度的情况。然后讨论了模型中不同弹簧刚度的计算方法。给出了采用细观力学方法以及均匀化方法等计算含损伤蒙皮等效刚度的计算方法,推导得到了规则排列多列螺栓连接中各排螺栓等效刚度的计算方法,并证明该刚度满足叠加原理。最后,以含圆形损伤孔的复合材料蒙皮板的螺接修理问题为例,对模型进行了考核,并与有限元法(FEM)预测结果进行了对比。结果表明:模型预测结果与有限元结果吻合较好,预测误差最大为7.7%。采用该模型可以高效、准确地实现复合材料螺接修理的分析设计。
The repairing of composite screw has the advantages of simple operation, less requirement on the surface treatment of connector, quick construction, reliable performance and so on. It is widely used in the temporary repairs of composite materials, especially the war repairs. However, its repair design process is more complicated, it is difficult to meet the needs of rapid project parameters. Based on the spring mass model of screw joint, aiming at the condition of equal width of skin and patch, a method for calculating the load transfer ratio of composite screw repair structure was proposed. The model is modified by introducing the principle of load distribution according to the stiffness distribution and the model is further extended to the case where the width of the skin is greater than the width of the patch. Then the calculation method of different spring stiffness in the model is discussed. The method of calculating the equivalent stiffness of skin with damaged skin by using meso-mechanics method and homogenization method is given. The calculation method of equivalent stiffness of each row of bolt in regular arrangement multi-row bolt connection is deduced and the stiffness is satisfied Overlay principle. Finally, the problem of bolting repairing of composite skin panels with circular damaged holes is taken as an example. The model is evaluated and compared with FEM prediction results. The results show that the model predictions agree well with the finite element results and the prediction errors are up to 7.7%. The model can be used to efficiently and accurately analyze the design of composite bolting repair.