Influence of Plastic Deformation Capacity on Failure Behavior of Pipelines

Influence of Plastic Deformation Capacity on Failure Behavior of Pipelines Plastic deformation capacity parameters affect the deformability of steel in the plastic stage and then affect the limit pressure of pipelines. This paper investigates the influence of plastic deformation capacity parameters on the limit bearing capacity of pipelines. These parameters include yield-to-tensile ratio ( $$\sigma_{y} /\sigma_{u}$$ σ y / σ u ), percentage uniform elongation ( $$\delta$$ δ ) and strain hardening exponent (n). Based on the Swift strain hardening model, the relational expression of the plastic deformation capacity parameters is theoretically deduced. Ninety-five groups of material tensile test data have been collected. Based on these test data, the variation tendency of the plastic deformation capacity parameters has been analyzed statistically, and the empirical formula of the key parameters has been fitted numerically. Twenty groups of finite element examples are designed to analysis the influence of yield-to-tensile ratio and uniform elongation on the limit pressure of pipeline. Results show that, with the improvement in strength grade of steel, the plastic deformability of steel decreases; the recommended critical plastic deformation capacity indexes are: (1) pipeline steel below X65, $$\sigma_{y} /\sigma_{u}$$ σ y / σ u  ≤ 0.85 and $$\delta$$ δ  ≥ 10%; (2) pipeline steel for X70–X80, $$\sigma_{y} /\sigma_{u}$$ σ y / σ u  ≤ 0.93 and $$\delta$$ δ  ≥ 8%. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Failure Analysis and Prevention Springer Journals

Influence of Plastic Deformation Capacity on Failure Behavior of Pipelines

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Publisher
Springer US
Copyright
Copyright © 2018 by ASM International
Subject
Materials Science; Tribology, Corrosion and Coatings; Characterization and Evaluation of Materials; Classical Mechanics; Structural Mechanics; Quality Control, Reliability, Safety and Risk
ISSN
1547-7029
eISSN
1864-1245
D.O.I.
10.1007/s11668-018-0414-8
Publisher site
See Article on Publisher Site

Abstract

Plastic deformation capacity parameters affect the deformability of steel in the plastic stage and then affect the limit pressure of pipelines. This paper investigates the influence of plastic deformation capacity parameters on the limit bearing capacity of pipelines. These parameters include yield-to-tensile ratio ( $$\sigma_{y} /\sigma_{u}$$ σ y / σ u ), percentage uniform elongation ( $$\delta$$ δ ) and strain hardening exponent (n). Based on the Swift strain hardening model, the relational expression of the plastic deformation capacity parameters is theoretically deduced. Ninety-five groups of material tensile test data have been collected. Based on these test data, the variation tendency of the plastic deformation capacity parameters has been analyzed statistically, and the empirical formula of the key parameters has been fitted numerically. Twenty groups of finite element examples are designed to analysis the influence of yield-to-tensile ratio and uniform elongation on the limit pressure of pipeline. Results show that, with the improvement in strength grade of steel, the plastic deformability of steel decreases; the recommended critical plastic deformation capacity indexes are: (1) pipeline steel below X65, $$\sigma_{y} /\sigma_{u}$$ σ y / σ u  ≤ 0.85 and $$\delta$$ δ  ≥ 10%; (2) pipeline steel for X70–X80, $$\sigma_{y} /\sigma_{u}$$ σ y / σ u  ≤ 0.93 and $$\delta$$ δ  ≥ 8%.

Journal

Journal of Failure Analysis and PreventionSpringer Journals

Published: Mar 2, 2018

References

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