Experimental methodology for the quantification of crack tip plastic zone and shape from the analysis of displacement fields

Vasco-Olmo, JM, Diaz, FA, James, MN, Christopher, CJ and Patterson, EA ORCID: 0000-0003-4397-2160 (2017) Experimental methodology for the quantification of crack tip plastic zone and shape from the analysis of displacement fields. FRATTURA ED INTEGRITA STRUTTURALE, 11 (41). pp. 166-174.

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Abstract

The current work presents a novel methodology for the experimental quantification of the crack tip plastic zone during fatigue crack growth. This methodology is based on the application of yield criteria to estimate the area and the shape of the plastic zone at the crack tip. The implementation of the proposed methodology requires the use of strain maps calculated from the differentiation of the displacement fields obtained by digital image correlation (DIC). Stress maps can subsequently be inferred from both von Mises and Tresca yield criteria. Fatigue tests and associated measurements of plastic zone size and shape were conducted on a compact-tension specimen made from commercially pure titanium at R ratio of 0.6. In addition, the ability to predict the shape and size of the experimentally observed crack tip plastic zone has been explored using three different analytical elastic crack tip models [Westergaard, Williams and Christopher-James-Patterson (CJP)]. This analysis indicated that the CJP model provided the most accurate prediction of the plastic zone and shape.

Item Type:	Article
Uncontrolled Keywords:	Crack tip plastic zone, Fatigue, Crack tip fields, Crack shielding, Stress intensity factor, DIC
Depositing User:	Symplectic Admin
Date Deposited:	03 Jan 2018 16:28
Last Modified:	19 Jan 2023 06:46
DOI:	10.3221/IGF-ESIS.41.23
Open Access URL:	http://www.gruppofrattura.it/pdf/rivista/numero41/...
Related URLs:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3015267