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A novel constitutive model for multi-step stress relaxation ageing of a pre-strained 7xxx series alloy
File | Description | Size | Format | |
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PAPER2-Revised Manuscript_final.pdf | Accepted version | 2.43 MB | Adobe PDF | View/Open |
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 |