Crack closure effects during low cycle fatigue propagation in line pipe steel: An analysis with digital image correlation

被引：36
|
作者：
Rabbolini, S. [1 ]
Beretta, S. [1 ]
Foletti, S. [1 ]
Cristea, M. E. [2 ]
机构：
[1] Politecn Milan, Dept Mech Engn, I-20156 Milan, Italy
[2] Dalmine SpA, TenarisDalmine R&D Struct Integr Dept, I-24044 Dalmine, BG, Italy
来源：
ENGINEERING FRACTURE MECHANICS | 2015年 / 148卷
关键词：
Very low cycle fatigue; Crack propagation; Short cracks; Effective J-Integral; Crack-closure; Digital image correlation; HIGH-TEMPERATURE; OPENING LOADS; ROTOR STEELS; GROWTH; NOTCHES; BODIES; LCF;
D O I：
10.1016/j.engfracmech.2015.07.070
中图分类号：
O3 [力学];
学科分类号：
08 ; 0801 ;
摘要：
Fatigue crack growth was investigated in a line pipe steel. Severe straining conditions, like those experienced by pipelines, were considered during the experiments. Crack closure effects were investigated during the tests by adopting an innovative technique based on digital image correlation. Experimentally measured crack closure levels were implemented in a crack propagation model based on elastic-plastic fracture mechanics. A modified formulation of Delta J(eff), necessary to accurately describe crack propagation driving forces, is presented and employed to assess fatigue life in presence of high plastic strains. (C) 2015 Elsevier Ltd. All rights reserved.
引用
收藏
页码：441 / 456
页数：16
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