Contact Pressure Model of Fastener Interface with Stress Singularities
Contact Pressure Model of Fastener Interface with Stress Singularities
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DOI：
10.3901/jme.2014.23.089
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发表时间：
2014
影响因子：
--
通讯作者：
Linbo Zhu
中科院分区：
文献类型：
--
作者：
Linbo Zhu
将紧固件接触问题简化为在法向力和弯矩作用下的弹性凸模无摩擦接触。从BOGY特征方程出发，研究了消除双材料界面端应力奇异性的几何条件。应用GLADWELL接触力学理论，建立了弹性凸模无摩擦接触模型。研究了螺栓拉力、装配间隙和构件材料对紧固件接触压力的影响。结果表明，在规定的螺栓拉力、装配等级和构件材料条件下，接触宽度不属于后退接触，但应力奇异性发生明显。螺栓拉力对应力奇异性的影响可以忽略不计，而装配等级和构件材料对应力奇异性的影响非常显著。当螺栓材料的弹性模量大于构件的弹性模量时，紧固件界面内侧的应力奇异性大于外侧的应力奇异性。否则，内部应力奇异性小于外部应力奇异性。有限元分析结果与理论计算结果的对比表明，该模型能够准确预测紧固件界面的接触压力分布。
The contact problem of fastener interface is simplified an elastic punch frictionless contact subjected to normal force and bending moment. Based on BOGY’s characteristic equation, the geometrical conditions of eliminating stress singularities near bi-materials interface end are investigated. An elastic punch frictionless contact model is proposed using GLADWELL’s contact mechanics. The influence of bolt tension, assembly clearance and member materials on the contact pressure of fastener interface has been studied. The results show that under regulations bolt tension, assembly grade and member materials, the contact width doesn’t fall into the class of receding contact, but the stress singularities has been obviously happen. The effects of bolt tension on stress singularities are negligible, while influence of the assembly grade and member materials is very markedly. The stress singularities of fastener interface inside are greater than one of outside as the elastic modulus of bolt material greater than the member. Otherwise, the inside stress singularities is less than outside one. Moreover, the comparison between the finite element analysis and the theoretical calculation results shows that the proposed model can accurately predict the contact pressure distribution of fastener interface.