Analysis of hammering deformation processes by the dynamic explicit finite element method
Focusing on dynamic deformation process at hammer equipment, a finite deformation elasto-plastic finite element code is developed based on the continuum mechanics and finite deformation theory. To analyze the effect of inertia force on deformation process under dynamic loading, a dynamic analysis method is used in the program. In integration, a central difference explicit algorithm is selected to calculate the deformation of the specimen. Moreover, the hammer ram velocity is calculated according to the energy method during deformation. The deformation processes of copper block specimen under different ram velocities are simulated using the developed code. And the deformed configuration of specimen, the displacement and equivalent plastic strain distribution in specimen are investigated. Then the simulated results are compared with that obtained by the static implicit program. The calculated results show that the deformation in specimen is uniform at a low ram velocity, which is almost same as that of static implicit program. When the ram velocity becomes very high, the plastic deformation is mainly concentrated on the upper part of specimen, and the deformed configuration exhibits obvious mushrooming. This is different from that of static implicit program, and it can be analyzed from the viewpoint of the inertia effect and stress wave propagation. The results indicate that the developed code adequately considers dynamic characteristic of hammering deformation process, and it can be used to analyze the effect of ram velocity on the deformed configuration, displacement of material point and metal plastic flow pattern.
hammering dynamic explicit inertia effect stress wave propagationhammering dynamic explicit inertia effect stress wave propagation
Lidong CHENG Zhongjin WANG
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, People’s Republic of China
国际会议
郑州
英文
2007-10-23（万方平台首次上网日期，不代表论文的发表时间）