Ductile crack growth of high-graded pipeline steels in the presence of Lüders plateau

IF 3 2区 工程技术 Q2 ENGINEERING, MECHANICAL
Shengwen Tu , Yu Tang , Yinhui Zhang , Yan Zhou , Jie Shu
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Abstract

Strain-based engineering critical assessment methods allows certain amount of plastic strain during installation and in service, for pipelines crossing seismically-active areas. Most strain-based engineering critical assessment methods are established for materials with smooth stress-strain relationship, leaving the so-called Lüders plateau influence on ductile fracture response seldomly explored. This work studied the effect of the Lüders plateau on mode I ductile crack growth with the modified boundary layer (MBL) model under plane strain conditions. The “up-down-up” constitutive model was implemented and the Gurson damage model was selected to simulate crack propagation. Factors including the plateau length and softening modulus in the “up-down-up” constitutive model, strain hardening of the matrix material and the initial void volume fraction parameter were analyzed. Numerical results show that the Lüders plateau modifies the crack tip constraint and the damage evolution, and the plateau length plays the dominant role on ductile crack growth behaviour in the presence of Lüders plateau.

存在吕德斯高原的高钢级管道钢的延展性裂纹生长
基于应变的工程临界评估方法允许穿越地震活动区的管道在安装和使用过程中产生一定量的塑性应变。大多数基于应变的工程临界评估方法都是针对具有平滑应力应变关系的材料制定的,因此很少探讨所谓的 Lüders 高原对延性断裂响应的影响。这项研究利用平面应变条件下的修正边界层(MBL)模型,研究了吕德斯高原对模式 I 延展性裂纹生长的影响。采用 "上-下-上 "构成模型,并选择 Gurson 损伤模型模拟裂纹扩展。分析的因素包括 "上-下-上 "构成模型中的高原长度和软化模量、基体材料的应变硬化以及初始空隙体积分数参数。数值结果表明,吕德斯高原改变了裂纹尖端约束和损伤演化,在吕德斯高原存在的情况下,高原长度对韧性裂纹生长行为起着主导作用。
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来源期刊
CiteScore
5.30
自引率
13.30%
发文量
208
审稿时长
17 months
期刊介绍: Pressure vessel engineering technology is of importance in many branches of industry. This journal publishes the latest research results and related information on all its associated aspects, with particular emphasis on the structural integrity assessment, maintenance and life extension of pressurised process engineering plants. The anticipated coverage of the International Journal of Pressure Vessels and Piping ranges from simple mass-produced pressure vessels to large custom-built vessels and tanks. Pressure vessels technology is a developing field, and contributions on the following topics will therefore be welcome: • Pressure vessel engineering • Structural integrity assessment • Design methods • Codes and standards • Fabrication and welding • Materials properties requirements • Inspection and quality management • Maintenance and life extension • Ageing and environmental effects • Life management Of particular importance are papers covering aspects of significant practical application which could lead to major improvements in economy, reliability and useful life. While most accepted papers represent the results of original applied research, critical reviews of topical interest by world-leading experts will also appear from time to time. International Journal of Pressure Vessels and Piping is indispensable reading for engineering professionals involved in the energy, petrochemicals, process plant, transport, aerospace and related industries; for manufacturers of pressure vessels and ancillary equipment; and for academics pursuing research in these areas.
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