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A novel constitutive model for multi-step stress relaxation ageing of a pre-strained 7xxx series alloy

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Title: A novel constitutive model for multi-step stress relaxation ageing of a pre-strained 7xxx series alloy
Authors: Zheng, J
Lin, J
Pan, R
Lee, J
Li, C
Davies, CM
Item Type: Journal Article
Abstract: A novel set of unified constitutive equations has been developed and validated to describe stress relaxation ageing (SRA) behaviour of 7xxx series aluminium alloys. The model, based on dynamic ageing and power-law creep relations, can predict the stress relaxation, age hardening response and their interactions at different temperatures, through considering the microstructure evolutions (precipitate radius, volume fraction and dislocation density) during SRA. In addition, the model newly incorporates the effects of prior plastic strain. This model was verified through T74 multi-step SRA experiments for different pre-strain conditions. Excellent agreement was achieved between the predicted and experimental results for stress relaxation and yield strength variation. The evolution of micro-internal variables (e.g. normalised precipitate radius) within the model were calibrated by observing transmission electron microscopy (TEM) images performed in this work and available in literature. The advanced constitutive model developed predicts the mechanical properties and residual stresses in components after ageing. Therefore, the model provides a valuable tool to optimise manufacturing processes leading to many benefits including reduced scrap rates and financial losses.
Issue Date: 1-Jul-2018
Date of Acceptance: 11-Feb-2018
URI: http://hdl.handle.net/10044/1/57971
DOI: 10.1016/j.ijplas.2018.02.008
ISSN: 0749-6419
Publisher: Elsevier
Start Page: 31
End Page: 47
Journal / Book Title: International Journal of Plasticity
Volume: 106
Issue: 1
Copyright Statement: © 2018 Elsevier Ltd. All rights reserved. This manuscript is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/
Sponsor/Funder: AVIC Manufacturing Technology Institute
First Aircraft Institute
Funder's Grant Number: N/A
N/A
Keywords: Science & Technology
Technology
Engineering, Mechanical
Materials Science, Multidisciplinary
Mechanics
Engineering
Materials Science
Stress relaxation ageing
Constitutive modelling
174 multi-step ageing
Microstructures
Pre-strain conditions
Aluminium alloy 7050
ZN-MG ALLOY
ALUMINUM-ALLOYS
CU ALLOY
PRECIPITATION KINETICS
MECHANICAL-PROPERTIES
CRYSTAL PLASTICITY
CREEP-BEHAVIOR
EVOLUTION
MICROSTRUCTURE
DEFORMATION
0905 Civil Engineering
0912 Materials Engineering
0913 Mechanical Engineering
Mechanical Engineering & Transports
Publication Status: Published
Online Publication Date: 2018-02-28
Appears in Collections:Mechanical Engineering
Faculty of Engineering