摘要
Temperature-dependent elastic viscoplastic material model was used for the numerical simulation of the friction stir welding process. The non-elastic response of the rate-dependent material in the large deformation problems was calculated by using the closest point algorithm. The numerical results show that the shape of the equivalent plastic strain looks like onion rings and the spacing of the rings is approximately equal to the forward movement of the tool in one rotation. The equivalent plastic strain is increased with the increase of viscosity coefficient due to the increase of friction stress in the pin-plate interface. The region which is influenced by the rotating tool is decreased with the decrease of viscosity coefficient. The radial and circumferential stresses in front of the pin are greater than the ones behind the pin. This difference can be reduced with the decrease of viscosity.
Temperature-dependent elastic viscoplastic material model was used for the numerical simulation of the friction stir welding process. The non-elastic response of the rate-dependent material in the large deformation problems was calculated by using the closest point algorithm. The numerical results show that the shape of the equivalent plastic strain looks like onion rings and the spacing of the rings is approximately equal to the forward movement of the tool in one rotation. The equivalent plastic strain is increased with the increase of viscosity coefficient due to the increase of friction stress in the pin-plate interface. The region which is influenced by the rotating tool is decreased with the decrease of viscosity coefficient. The radial and circumferential stresses in front of the pin are greater than the ones behind the pin. This difference can be reduced with the decrease of viscosity.
出处
《中国有色金属学会会刊：英文版》
EI
CSCD
2006年第5期1045-1052,共8页
Transactions of Nonferrous Metals Society of China
基金
Porjects(10225212
10421002
10302007) supported by the National Natural Science Foundation of China
Project supported by the Program of Changjiang Scholars and the Innovative Research Team in University of China(PCSIRT) and Project(2005CB321704) supported by the National Basic Research Program of China
关键词
机械关联模型
搅拌摩擦焊接
粘度
FSW
rote-dependent model
constitutive relationship
radial return mapping algorithm
friction stir welding
