Numerical simulation of instability and wrinkling in stretch forming of thin-walled surface
Wrinkling is a common defect in sheet metal forming,which seriously affects the quality of surface forming.In order to study the surface instability and wrinkling under different loading paths,three loading paths were designed,and the corresponding forming processes were numerically simulated.The results showed that the loading path had a great influence on the wrinkling phenomenon of the formed surface.When subjected to large compressive stress,the sheet metal in the suspended state was prone to out-of-plane instability and wrinkling due to insufficient restraint.The friction between sheet metal and die could reduce the compressive stress of sheet metal,and the wrinkling could be effectively restrained by adjusting the contact state between sheet metal and die.In the minimum deformation loading path surface forming,the sheet metal and the die were in good contact,and a smooth and wrinkle free surface could be obtained.
万方数据
维普
