Abstract

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.

DOI

10.1016/j.tafmec.2019.03.009

Publication Date

2019-03-15

Publication Title

Theoretical and Applied Fracture Mechanics

Volume

101

First Page

332

Last Page

341

ISSN

0167-8442

Embargo Period

2020-03-26

Organisational Unit

School of Engineering, Computing and Mathematics

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