Computation of Dynamic Stress in Flexible Multi-body Dynamics Using Absolute Nodal Coordinate Formulation

摘要

Recently, the finite element absolute nodal coordinate formulation (ANCF) was developed for the large deformation analysis of flexible bodies in multi-body dynamics. This formulation is based on the finite element method and the general continuum mechanics theory to represent the elastic forces. In this paper, a computational method of dynamic stress in flexible multi-body dynamics using absolute nodal coordinate formulation is proposed. Numerical examples, based on the Euler-Bernoulli beam theory, are shown to verify the efficiency of the proposed method. This method can be applied to predict the fatigue life of a mechanical system. In conclusion, it is possible to improve the reliability of a product by analyzing the dynamic stress time history in the design stage of product development using computer simulation. Moreover, this study demonstrates that structural and multi-body dynamic models can be unified into one numerical system.