基于非线性虚拟材料栓接结合部动力学建模方法

为仿真栓接结合部非线性动力学特性，提出一种基于非线性横观各向同性虚拟材料的栓接结合部动力学建模方法.基于有限单元法，利用8节点实体单元构建被连接件及用来等效栓接结合部的横观各向同性虚拟材料层，虚拟材料层与被连接件固接.采用非线性虚拟材料等效栓接结合部，以模拟含栓接结合部结构在不同幅值的外简谐激振下所体现出的非线性刚度特性.为提高非线性模型计算精度，将非线性横观各向同性虚拟材料层进行分区处理，每个区域虚拟材料参数分别由该区域虚拟材料的形变确定.最后，对模型进行局部降维，在时域下求解模型的幅频响应，通过对比仿真计算结果和试验结果，验证所提出建模方法的可行性与有效性.

Dynamic Modeling Method of Bolted Joint Interfaces Based on Nonlinear Transversely Isotropic Virtual Material

To simulate the nonlinear dynamic characteristics of bolted joint， a dynamic modeling method of bolted joint based on nonlinear transversely isotropic virtual material is proposed. Based on the finite element method， 8-node solid elements are used to construct the connected parts and the bolted joint that is simulated by the transversely isotropic virtual material， and the virtual material is fixed to the connected parts. The nonlinear virtual material is used to simulate the nonlinear stiffness characteristics of the bolted joint under different external harmonic excitation forces. In order to make the calculation of the nonlinear model more accurate， the nonlinear transversely isotropic virtual material is partitioned， and the virtual material parameters of each region are determined by the deformation of the virtual material in the region. Finally， the dimension of the model is reduced partly and the amplitude frequency response of the model is solved in time domain. The feasibility and effectiveness of the as-proposed modeling method are verified by comparing the theoretical calculation results with that of the experiments.