Test-piece design for experimental and numerical evaluation of damage in relation to spatial triaxial stress inversion

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Title: Test-piece design for experimental and numerical evaluation of damage in relation to spatial triaxial stress inversion
Authors: Kaye, MC
Balint, D
Lin, J
Farrugia, D
Item Type: Journal Article
Abstract: This work examines the effect of stress state on the nucleation and growth of damage during hot deformation of free cutting steel. A test-piece was designed to emulate stress states similar to those found in hot rolling. The novelty of the new design is its ability to maintain a constant spatial stress state during deformation, allowing a true correlation of the damage mechanism to the stress triaxiality; previous sample geometries had a large variation in stress during plastic deformation, which made it impossible to relate an observed damage mechanism to a particular stress state using a single sample. Continuum damage equations were calibrated using uniaxial tensile tests and implemented into finite element models of compressive test-pieces. The stress distributions in each test-piece geometry were compared and a single test-piece design was chosen with an optimised triaxial stress distribution. The test-piece was deformed at elevated temperatures, sectioned and the microstructure was evaluated. The combination of stress state and strain computed via finite element analysis was compared to the damage produced across the test-piece section. The predictions of the damage equations were compared to the results of physical tests and used to identify appropriate damage models. The effect of stress state on damage was evaluated, which can be used to update and improve existing material models. The stress triaxiality was found to be the dominant factor for damage around inclusions, with a minimum stress triaxiality required for damage growth to occur.
Issue Date: 11-Mar-2016
Date of Acceptance: 11-Mar-2016
URI: http://hdl.handle.net/10044/1/48797
DOI: http://dx.doi.org/10.1177/1056789516635725
ISSN: 1530-7921
Publisher: SAGE Publications
Start Page: 588
End Page: 607
Journal / Book Title: International Journal of Damage Mechanics
Volume: 26
Issue: 4
Copyright Statement: © The Author(s) 2016. The final, definitive version of this paper has been published in MC Kaye, D Balint, J Lin, D Farrugia (2017) Test-piece design for experimental and numerical evaluation of damage in relation to spatial triaxial stress inversion. International Journal of Damage Mechanics Vol 26, Issue 4, pp. 588 - 607 by Sage Publications Ltd. All rights reserved. It is available at: http://dx.doi.org/10.1177/1056789516635725
Sponsor/Funder: Royal Academy Of Engineering
Funder's Grant Number: MESM_P54595
Keywords: Science & Technology
Materials Science, Multidisciplinary
Materials Science
Ductile damage
hot rolling
finite element simulation
stress state
high temperature testing
stress triaxiality
Mechanical Engineering & Transports
0912 Materials Engineering
0913 Mechanical Engineering
0905 Civil Engineering
Publication Status: Published
Appears in Collections:Faculty of Engineering
Mechanical Engineering
Faculty of Natural Sciences

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