Influence of yield-to-tensile strength ratio (Y/T) on failure assessment of defect-free and corroded X70 steel pipeline
来源期刊：中南大学学报(英文版)2014年第2期
论文作者：ZHANG Shun-hu(章顺虎) ZHAO De-wen(赵德文) WANG Xiao-nan(王晓南)
文章页码：460 - 465
Key words：yield-to-tensile strength ratio; X70 steel pipeline; strain hardening exponent; burst pressure; engineering tensile strength
Abstract: The effect of yield-to-tensile strength ratio (Y/T) on failure pressure of X70 pipeline without and with corrosion defects was investigated. The stress-strain response of materials was characterized by a power-law hardening curve. Two formulas to estimate the strain hardening exponent n for a special Y/T were obtained by least squared regression method and the influence of Y/T on n was analyzed. As an application of n-Y/T expression, the analytical solutions of burst pressure for X70 pipeline without and with corrosion defects were also obtained. The results indicate that the burst pressure of defect-free X70 pipe without corrosion defects is a function of the Y/T, pipe geometry t0/D0 and engineering tensile strength, and increases as Y/T or t0/D0 increases; whilst the burst pressure of corroded X70 pipe decreases with the increase of defect depths, d/t. Comparisons indicate that the present analytical solutions closely match available experimental and numerical data.
ZHANG Shun-hu(章顺虎)1, 2, ZHAO De-wen(赵德文)1, WANG Xiao-nan(王晓南)2
(1. State Key Laboratory of Rolling and Automation (Northeastern University), Shenyang 110819, China;
2. Shagang School of Iron and Steel, Soochow University, Suzhou 215021, China)
Abstract:The effect of yield-to-tensile strength ratio (Y/T) on failure pressure of X70 pipeline without and with corrosion defects was investigated. The stress-strain response of materials was characterized by a power-law hardening curve. Two formulas to estimate the strain hardening exponent n for a special Y/T were obtained by least squared regression method and the influence of Y/T on n was analyzed. As an application of n-Y/T expression, the analytical solutions of burst pressure for X70 pipeline without and with corrosion defects were also obtained. The results indicate that the burst pressure of defect-free X70 pipe without corrosion defects is a function of the Y/T, pipe geometry t0/D0 and engineering tensile strength, and increases as Y/T or t0/D0 increases; whilst the burst pressure of corroded X70 pipe decreases with the increase of defect depths, d/t. Comparisons indicate that the present analytical solutions closely match available experimental and numerical data.
Key words:yield-to-tensile strength ratio; X70 steel pipeline; strain hardening exponent; burst pressure; engineering tensile strength
