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首页> 外文会议>DE-vol.119; CED-vol.11; American Society of Mechanical Engineers(ASME) International Mechanical Engineering Congress and Exposition; 20061105-10; Chicago,IL(US) >A COMBINED STRESS MODEL FOR THE ELASTO-PLASTIC ANALYSIS OF CLAMP LOADS IN BOLTED JOINTS UNDER A CYCLIC SEPARATING FORCE
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A COMBINED STRESS MODEL FOR THE ELASTO-PLASTIC ANALYSIS OF CLAMP LOADS IN BOLTED JOINTS UNDER A CYCLIC SEPARATING FORCE

机译：循环力作用下锚固节点夹固载荷弹塑性分析的复合应力模型

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摘要

In this paper, a nonlinear combined stress model is established for a typical bolted joint for the purpose of studying its behavior under a separating service load. The combined effect of axial and torsional stresses in the tightened threaded fastener is considered. A new approach for the analysis of the clamping force loss is proposed under different pre-tightening with different thread friction coefficient and different separating loading. The_nonlinear model is established based on the elasto-perfectly plasticity in order to describe the fastener behavior over the yielding of its material, and to determine the relationship between the axial bolt force and elongation under tightening and the separating loading with specific twist angle, and to predict the clamp force loss due to the permanent set in the fastener after the separating force has been removed. The nonlinear relationship between the bolt axial force and the bolt elongation depends on the initial twist angle and the tightening preload. Finally, the effects_of the fastener pre-tightening, the initial twist angle and the bolt and joint members' elastic properties on the amount of clamp load loss are investigated.
机译：本文针对典型螺栓连接建立了非线性组合应力模型，以研究其在单独使用载荷下的行为。考虑了拧紧的螺纹紧固件中轴向应力和扭转应力的综合作用。提出了一种在不同的预紧状态下，采用不同的螺纹摩擦系数和不同的分离载荷对夹紧力损失进行分析的新方法。基于弹塑性完全可塑性建立_非线性模型，以描述紧固件在其材料屈服方面的行为，并确定轴向螺栓力与紧固时的伸长率以及具有特定扭转角的分离载荷之间的关系，并预测在去除分离力后由于紧固件中的永久变形而导致的夹紧力损失。螺栓轴向力和螺栓伸长之间的非线性关系取决于初始扭转角和拧紧预紧力。最后，研究了紧固件的预紧，初始扭转角以及螺栓和连接件的弹性特性对夹紧载荷损失量的影响。

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