Please use this identifier to cite or link to this item: https://hdl.handle.net/10316/101247
Title: Numerical Prediction of the Fatigue Crack Growth Rate in SLM Ti-6Al-4V Based on Crack Tip Plastic Strain
Authors: Ferreira, Fábio 
Neto, Diogo M. 
Jesus, Joel S. 
Prates, Pedro A. 
Antunes, Fernando V. 
Keywords: fatigue crack growth; finite element analysis; plastic strain; Ti-6Al-4V; titanium alloy; additive manufacturing
Issue Date: 2020
Project: PTDC/EME-EME/28789/2017 
PTDC/EMEEME/31657/2017 
UIDB/00285/2020 
Serial title, monograph or event: Metals
Volume: 10
Issue: 9
Abstract: This study presents a numerical model to predict the fatigue crack growth (FCG) rate in compact tension specimens under constant amplitude cyclic loadings. The material studied is the Ti-6Al-4V titanium alloy produced by selective laser melting, which was submitted to two di erent post-treatments: (i) hot isostatic pressing, and (ii) heat treatment. The developed finite element model uses the cumulative plastic strain at the crack tip to define the nodal release. Two di erent FCG criteria are presented, namely the incremental plastic strain (IPS) criterion and the total plastic strain (TPS) criterion. The calibration of the elasto-plastic constitutive model was carried out using experimental data from low cycle fatigue tests of smooth specimens. For both proposed crack growth criteria, the predicted da/dN-DK curve is approximately linear in log-log scale. However, the slope of the curve is higher using the TPS criterion. The numerical predictions of the crack growth rate are in good agreement with the experimental results, which indicates that cyclic plastic deformation is the main damage mechanism. The numerical results showed that increasing the stress ratio leads to a shift up of the da/dN-DK curve. The e ect of stress ratio was dissociated from variations of cyclic plastic deformation, and an extrinsic mechanism, i.e., crack closure phenomenon, was found to be the cause.
URI: https://hdl.handle.net/10316/101247
ISSN: 2075-4701
DOI: 10.3390/met10091133
Rights: openAccess
Appears in Collections:I&D CEMMPRE - Artigos em Revistas Internacionais

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