Abstract

The rigid-plastic finite element formulation including the inertia force is derived and then the rigid-plastic finite elemnt program considering the inertia effect is developed. In order to consider the strain hardening, strain rate hardening and thermal softening effects which are frequentrly observed in high-velocity deformation phenomena, the Johnson-Cook constitutive odel is applied. The developed program is used to simulate two high-velocity deformation problemss ; rod impact test and hdigh-velocity compression precess. As a result of rod impact test simulation, it is found that the siulated result has a good agreement with the experimental observation. Through the high-velocity compression process simulation. it is also found that the accuracy of the simulated results is dependent upon the time increment size and mesh size.

Keywords

• Reigid-Plastic Finite Element Method;
• Inertia Effect;
• Rod Impact Simulation;
• High-Velocity Compression Simulation

• 강소성 유한요소법;
• 관성효과;
• 환봉충격해석;
• 고속압축해석;