Improvement of Contact Force Calculation Model Considering Influence of Yield Strength on Coefficient of Restitution

Abstract

Aiming at the problem that the current coefficient of restitution model cannot effectively predict energy dissipation in the multi-body system collision process, a coefficient of restitution model considering the yield strength is proposed in this article. As an important parameter for energy loss and material deformation prediction during collision, the coefficient of restitution has an important influence on the accurate calculation of contact force. The current main coefficient of restitution models are compared and analyzed in this article. In view of the large difference between the results obtained by different models on the same parameter, through the use of ANSYS/LS–DYNA for dynamic simulation, the influence of different yield strengths on the coefficient of restitution is studied. Then, the article establishes a new coefficient of restitution model considering the yield strength combined with the J–G model, and verifies the effectiveness of the model in the article using experimental results. At the same time, the article compares the new coefficient of restitution model with the constant coefficient of restitution model, and further studies the effect of the coefficient of restitution on the dynamic results.

Keywords

• multi-body system
• coefficient of restitution model
• yield strength