Analysis of Influence Factors to the Flexibility of Aircraft Structural Fasteners
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摘要: 紧固件柔度是飞机连接部位的疲劳寿命重要影响因素,常常作为考虑飞机结构疲劳寿命模拟和分析的主要参数。本文在验证弹塑性有限元法计算紧固件柔度有效性的基础上,利用弹塑性有限元法对不同紧固件连接的单搭接结构进行仿真分析,并由仿真分析得出的紧固件细节的载荷位移曲线计算紧固件柔度。分析表明:扁圆头铆钉铆钉头越小柔度值越大;埋头铆钉柔度值相对于扁圆头铆钉有所增大,十字槽埋头螺栓柔度值相对于埋头铆钉稍有增大;过盈配合使紧固件柔度值大幅减小。Abstract: The fastener flexibility plays an important role in the factors influencing the fatigue life of the aircraft joints, and is often used as a main parameter when modeling and analyzing aircraft fatigue and life-span.This pa-per, based on the verification of the effectiveness of Elastoplasticity Finite Element Method (EFEM) to the fastener flexibility, analyses the single lap joints connected to different fasteners using the EFEM.The flexibility of the fas-teners are calculated using the load-displacement curves of the fastener details.The results show that the smaller the head of the oval-head rivets, the greater of its flexibility, the flexibility value of countersunk rivet is bigger than that of the flat-head rivet; and the flexibility of cross recessed countersunk bolt is a little bigger than that of the flat-head rivet.The fastener flexibility is drastically reduced with interference fit.
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Key words:
- rivets /
- flexibility /
- the fatigue life
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