A Novel Method for Predicting Pin Load Distribution of Multiple-bolted Joints in Composite Laminates Based on Circuit Model
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摘要: 提出了一种新的计算复合材料多钉连接载荷分配方法,即将电路模型应用到复合材料多钉连接结构载荷分配估算中,多钉连接结构中的载荷、柔度和变形分别等效于电路模型的电流、电阻和电压。在新模型中材料的胡克定律转化为电学中的欧姆定律,变形协调方程等效于电学中的电压平衡方程。该方法使复杂的多钉连接模型变成了一些由简单的串联和并联电路组成的简单模型。对n排单列连接结构的电路模型进行分析,总能找到n-1个独立的闭环电压平衡方程和一个电流平衡方程,联立这n个方程就能够计算出各个钉上的电流大小,也就是相应的载荷值。在某些支路上添加恰当的电源,还可以模拟复合材料多钉连接结构的间隙或者过盈量。通过与试验结果对比,发现该方法能较好的预测出复合材料多钉连接载荷分配。Abstract: A novel method using circuit model to predict the pin load distribution of multiple-bolted joints in com-posite laminate was presented. The load,flexibility and deformation of the multiple-bolted joints were treated asequivalent to the current,resistance and voltage of the circuit model respectively. Based on the above assumptions,Hooke's law and the deformation compatibility equation in the original mechanics model were transformed intoOhm's law and voltage balance equation in the new circuit model. This method changed the complex model of mul-tiple bolted-joints in composite laminate into a simple circuit model which consists of some series circuits and paral-lel circuits. The analysis of the new circuit model had led to n －1 independent voltage balance equations and a cur-rent balance equation. With the n －1 equations,each bolt's current which is equivalent to its load can be calculat-ed. With the circuit model,power sources which were added as required in some subcircuits can also simulate theclearance or interference in multiple-bolted joints. Compared with the results of the multiple bolted-joints compositelaminate test,this new method can estimate well the load distribution of a multiple-bolted joints.
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Key words:
- circuit model /
- composite materials /
- multiple-bolted joint /
- pin load distribution /
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