Study on 3D Strain Distribution Characteristics Using Etched Grid Method in Tube Bending
Strain distribution is crucial for understanding tube bending and preventing defects.In this paper,taking 321 stainless steel as the objective,via etched grid method,the strain distribution characteristics during tube bending are studied,the effects of the bending velocity and the bending angle on the strain distribution are analyzed,and the consistency of thickness strain with wall thickness variation is verified.The results show that:(1) three-dimensional (3D) strain is symmetrically distributed about bending plane and reaches the maximum value at wall extrados and intrados; (2) absolute value of the 3D strain increases at first,then decreases in tube bending; (3)compared with bending angle,bending velocity has greater effect on spatial strain,and compared with tangent strain,thickness strain is more sensitive to bending velocity; (4) thickness strain distribution characteristics are generally consistent with distribution characteristics of wall thinning degree.
Strain distribution Grid method Tube bending
Heng Li He Yang Kaipeng Shi
State Key Laboratory of Solidification Processing,Northwestern Polytechnical University, Xian,710072, China
国际会议
香港
英文
505-509
2012-07-27（万方平台首次上网日期，不代表论文的发表时间）