Analysis of Hysteresis Behavior of Bolted Joint Interface
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摘要: 切向载荷作用下，螺栓接头界面随切向位移增大表现出明显的变阻尼和刚度软化特性。为有效表示接头界面的迟滞特性，旨在研究一种新的螺栓接头界面建模方法。基于Iwan模型，将预紧力产生在接头界面的正压力转换成切向力的均匀密度函数，建立螺栓接头界面的切向加载曲线与非线性迟滞回线理论模型。通过与原有的实验结果比较，验证了加载曲线与迟滞回线的正确性，并探讨了不同参数对迟滞回线的影响。结果表明，临界切向位移、初始刚度对迟滞回线的变化影响较为明显，残余刚度对迟滞行为影响主要体现在宏观滑移阶段。该模型可以有效地表达螺栓连接的复杂非线性特征，准确再现结合面的迟滞现象以及刚度软化现象。Abstract: The bolted joints interface exhibits the obvious variable amplitude damping and stiffness softening characteristics under the tangential loading. In order to study the changes in stiffness and damping, a hysteretic nonlinear model for the bolted joint must be established. Based on the Iwan model, the positive pressure generated by the pre-tightening force is converted into a function of the tangential force of the bolted joint interface. The tangential load model and hysteresis loops theoretical model for the bolted joint interface are established. Then through the comparison with the existing experiments, the correctness of the loading curve and hysteresis loop is verified. It is proved that the model can be used to analyze the bolted joint performance under different conditions.The results show that the critical tangential displacement and initial stiffness have significant effects on the change of hysteresis loops, and the effect of the residual stiffness on the hysteresis behavior is reflected in the macroscopic slip stage. Through the present model, the complex nonlinear characteristics of the bolted joints, the hysteresis phenomenon and the stiffness softening phenomenon of the joint interface can be accurately expressed.
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Key words:
- bolted joint /
- hysteresis loops /
- stiffness softening /
- equivalent modeling
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图 3 切向载荷下螺栓结合面滑移过程
Figure 3. The slippage process of the bolted interface under circumferential load
图 4 结合面压力分布简化示意图
Figure 4. Simplified diagram of pressure distribution on the interface
图 5 均匀密度分布函数示意图
Figure 5. Schematic diagram of the uniform density distribution function
图 9 不同临界切向位移对迟滞回线影响
Figure 9. The influence of different critical circumferential displacements on the hysteresis loop
图 11 不同残余刚度对迟滞回线影响
Figure 11. The influence of different residual stiffnesses on the hysteresis loop
图 10 不同初始刚度对迟滞回线影响
Figure 10. The influence of different initial stiffnesses on the hysteresis loop
表 1 模型验证参数值
Table 1. Model validation parameter values
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表 2 迟滞回线参数值
Table 2. Hysteresis loop parameter values
KT/108（N·m−1） KC/106（N·m−1） ϕm/μm 2.6 10 120 2.8 10 120 3 10 120 2.6 20 120 2.6 30 120 2.6 10 180 2.6 10 240
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