Research on limit load and defect tolerance for autofrettaged pipes with corrosion
Ultrahigh pressure pipe reactor is the key equipment of Low Density Polyethylene (LDPE), the maximum operating pressure is 270MPa, any accident leads to serious consequences. In the latest examination, corrosion pits were found at the bottom of pipes, influencing the safe operation. The pipes were treated by autofrettage under 700MPa pressure, residual stress was existed at inner wall, furthermore, the residual stress would redistribute when corroded, the limit load would be different from the pipes without autofrettage. In the present paper, ABAQUS was used to calculate limit loads of pipes with difform defects and pipes with autofrettage or not. Comparing the difference of limit loads, the most conservative situation, pipes with local wall thinning equal in depth without autofrettage, is chosen for defect tolerance research. Defects with different size were simulated to calculate limit loads, and the tolerance was given based on these limit loads.
Wutofrettage Corrosion Limit load Defect tolerance FEA
Xing Xin Jianping Zhao
School of Mechanical and Power Engineering, Nanjing University of Technology, Nanjing 210009, China
国际会议
2011 International Symposium on Structural Integrity 2011国际结构完整性学术研讨会--核工程结构完整性技术 ISSI 2011
合肥
英文
227-231
2011-10-27（万方平台首次上网日期，不代表论文的发表时间）