Experimental evaluation of the effect of overloads on fatigue crack growth by analysing crack tip displacement fields

•Methodology based on the analysis of SIFs for quantifying the effect of overloads.•Calculation of SIFs from the displacement fields measured around the crack tip.•Retardation effect on fatigue crack growth quantified by analysing the opening load.•CJP model constitutes a real alternative for evalua...

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Bibliographic Details
Published inEngineering fracture mechanics Vol. 166; pp. 82 - 96
Main Authors Vasco-Olmo, J.M., Díaz, F.A.
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.10.2016
Subjects
Crack shielding
Digital image correlation
Fatigue crack
Overload
Stress intensity factor
Stress intensity factor
Overload
Crack shielding
Digital image correlation
Fatigue crack
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Summary:•Methodology based on the analysis of SIFs for quantifying the effect of overloads.•Calculation of SIFs from the displacement fields measured around the crack tip.•Retardation effect on fatigue crack growth quantified by analysing the opening load.•CJP model constitutes a real alternative for evaluating fracture mechanics problems.•Results remove some controversy associated with crack closure phenomenon. In this work, the shielding effect on growing fatigue cracks under different overload levels is evaluated by estimating stress intensity factors from the analysis of crack tip displacement fields measured by digital image correlation (DIC). A novel model called CJP is implemented to characterise crack tip displacement fields. The retardation effect induced by overloads is quantified from the calculation of the crack opening load. Moreover, a compliance based method is employed to compare and validate those results obtained by DIC. Results show a good level of agreement, highlighting that CJP model is a powerful tool to evaluate fracture mechanics problems.
ISSN:0013-7944
1873-7315
DOI:10.1016/j.engfracmech.2016.08.026