Characterisation of fatigue crack growth using digital image correlation measurements of plastic CTOD

被引：54

作者：

Vasco-Olmo, J. M. ^{[1
]}

Diaz, F. A. ^{[1
]}

Antunes, F., V ^{[2
]}

James, M. N. ^{[3
,4
]}

机构：

[1] Univ Jaen, Dept Ingn Mecan & Minera, Jaen, Spain

[2] Univ Coimbra, Dept Mech Engn, Coimbra, Portugal

[3] Univ Plymouth, Sch Engn, Plymouth, Devon, England

[4] Nelson Mandela Metropolitan Univ, Dept Mech Engn, Port Elisabeth, South Africa

来源：

THEORETICAL AND APPLIED FRACTURE MECHANICS | 2019年 / 101卷

关键词：

Crack tip opening displacement (CTOD); Fatigue crack growth rate; DIC; Range of plastic CTOD; LOW-CYCLE FATIGUE; CLOSURE; PROPAGATION; MODEL; DISPLACEMENT; DEFORMATION; FIELDS;

D O I：

10.1016/j.tafmec.2019.03.009

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

Crack tip opening displacement (CTOD) was measured using digital image correlation (DIC) and resolved into elastic and plastic CTOD components via an offset compliance technique. The plastic CTOD range gave a single linear correlation for fatigue crack growth rate at stress ratios of 0.1 and 0.6 in compact-tension (CT) specimens of Grade 2 titanium. A sensitivity analysis was performed to find the optimum position in the crack wake to make the CTOD measurements. The results are the first time (to the authors knowledge) that plastic CTOD has been found directly from experimentation and demonstrate that plastic CTOD is a useful alternate characterising parameter for fatigue crack growth to the stress intensity factor defined by Irwin.

引用

页码：332 / 341

页数：10

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