Subjected to dynamic excitations, bolted joint interfaces exhibit nonlinear characteristics that significantly affect the dynamic response of assembled structures. In this paper, a novel modeling method is developed to improve the prediction accuracy of the tangential contact behavior of bolted joint interfaces. This method is based on the framework of the Iwan model and builds the relationship between the Iwan density function and the distribution of the contact pressure. It is the first time to give an explicit physical significance of the Iwan density function. The effectiveness of the proposed model is validated well by comparing with published experiments. Then the proposed model is integrated into a numerical model of a bolted joint structure and combined with the alternating frequency/time method to study its applicability in dynamics analysis. The model is fully compatible with the current state-of-the-art numerical analysis tools. The results show that the simulated interface responses are in good agreement with the experiment.

受动态激励的影响，螺栓连接的界面呈现出非线性特性，该特性极大地影响了组装结构的动力响应。本文提出了一种新的建模方法，以提高螺栓连接界面切向接触行为的预测精度。该方法基于Iwan模型的框架，建立了Iwan密度函数与接触压力分布之间的关系。这是第一次给出Iwan密度函数的明确物理意义。通过与已发布的实验进行比较，该模型的有效性得到了很好的验证。然后将所提出的模型集成到螺栓连接结构的数值模型中，并与交替频率/时间方法相结合，以研究其在动力学分析中的适用性。该模型与当前最新的数值分析工具完全兼容。结果表明，仿真的界面响应与实验吻合良好。