Apparent strain of a pipe at plastic bending buckling state

作者：Ji, L. K.; Zheng, M.^*; Chen, H. Y.; Zhao, Y.; Yu, L. J.; Hu, J.; Teng, H. P.

来源：Journal of the Brazilian Society of Mechanical Sciences and Engineering, 2015, 37(6): 1811-1818.

DOI：10.1007/s40430-014-0302-4

• Pipe bending
• Buckling
• Rigid-perfectly plastic
• Cross-sectional ovalization
• Apparent strain

An expression for apparent strain of a pipe at plastic bending buckling status is proposed in the present paper. The material of the pipe is considered as a rigid-perfectly plastic one, and the cross section of the pipe during the pipe-bending process assumes to be elliptic gradually. The energy rate for the pure bending of the elliptic pipe is proposed firstly, and the energy rate of cross-sectional ovalizing of the pipe is derived afterward. Furthermore, both the energy rates are combined to analyze the pipe bending buckling. As a result, an apparent strain expression of a pipe at the plastic bending buckling status is proposed. The predicted result of the new strain expression of pipe bending at buckling status is compared with the available test data and shows that the new formula is reasonable.

• 出版日期2015-11
• 单位西北大学; 中国石油天然气集团公司管材研究所; 西安交通大学