Influence of yield-to-tensile strength ratio (Y/T) on failure assessment of defect-free and corroded X70 steel pipeline

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.

Keywords

yield-to-tensile strength ratio / X70 steel pipeline / strain hardening exponent / burst pressure / engineering tensile strength

References

[1] ZhuX-k, Leis BrianN. Theoretical and numerical predictions of burst pressure of pipelines [J]. Transaction of the ASME, 2007, 129: 644-652

[2] MaB, ShuaiJ, LiuD-x, XuKui. Assessment on failure pressure of high strength pipeline with corrosion defects [J]. Engineering Failure Analysis, 2013, 32: 209-219

[3] ZhuX-k, Leis BrianN. Influence of yield-to-tensile strength ratio on failure assessment of corroded pipelines [J]. Transactions of the ASME, 2005, 127: 436-442

[4] MilnerJ L, BungetC, Abu-FarhaF, KurfessT, HammondV H. Modeling tensile strength of materials processed by accumulative roll bonding [J]. Journal of Manufacturing Processes, 2013, 15: 219-226

[5] SloterdijkW. The influence of the yield-to-tensile ratio on deformation controlled pipeline behaviour [C]. Proceedings of the 10th Biennial Joint Technical Meeting on Line Pipe Research, 1995, Cambridge, UK, British Steel: 18-21

[6] MutasV V, NetrebskiiM A, RabkinaM D. Analysis of strength estimation procedures for cylindrical structures with local surface defects subject to internal pressures [J]. Strength of Materials, 2012, 44(5): 574-578

[7] ZhouW, HuangG X. Model error assessments of burst capacity models for corroded pipelines [J]. International Journal of Pressure Vessels and Piping, 2012, 99/100: 1-8

[8] LiS-x, ZengH-l, YuS-r, ZhaiX, ChenS-p, LiangR, YuLong. A method of probabilistic analysis for steel pipeline with correlated corrosion defects [J]. Corrosion Science, 2009, 51: 3050-3056

[9] Hadj MelianiM, MatvienkoY G, PluvinageG. Corrosion defect assessment on pipes using limit analysis and notch fracture mechanics [J]. Engineering Failure Analysis, 2011, 18: 271-283

[10] XuL Y, ChengY F. Reliability and failure pressure prediction of various grades of pipeline steel in the presence of corrosion defects and pre-strain [J]. International Journal of Pressure Vessels and Piping, 2012, 89: 75-84

[11] Leis BrianN, StephensD R. An alternative approach to assess the integrity of corroded line pipe-Part I: Current status; Part II: Alternative criterion [C]. 7th International Conference on Offshore Pipelines and Polar Engineering, 1997, Honolulu, USA, ISOPE: 624-641

[12] ZhuX-k, LEIS BrianN. Strength criteria and analytic predictions of failure pressure in line pipes [J]. International Society of Offshore and Polar Engineers, 2004, 14(2): 125-132

[13] Hossein SeyedkashiS M, Valiollah PanhizadehR, XuH-b, KimS Y, MoonY H. Process analysis of two-layered tube hydroforming with analytical and experimental verification [J]. Journal of Mechanical Science and Technology, 2013, 27(1): 169-175

[14] ZhuX-k, Leis BrianN. Plastic collapse assessment of unequal wall joints in pipeline transitions [C]. Proceedings of the 2004 ASME PVP Conference, 2004, San Diego. California, ASME: 25-29

[15] ZhuX-k, LEIS BrianN. Evaluation of burst pressure prediction models for line pipes [J]. International Journal of Pressure Vessels and Piping, 2012, 89: 85-97