Imperial College London
Alternate

Dr Catrin Mair Davies

Faculty of Engineering, Department of Mechanical Engineering

Reader in Structural Integrity of Alloys
 
 
 
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Contact

 

+44 (0)20 7594 7035catrin.davies

 
 
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Location

 

517UnknownSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Zheng:2018:10.1016/j.ijplas.2018.02.008,
author = {Zheng, J and Lin, J and Pan, R and Lee, J and Li, C and Davies, CM},
doi = {10.1016/j.ijplas.2018.02.008},
journal = {International Journal of Plasticity},
pages = {31--47},
title = {A novel constitutive model for multi-step stress relaxation ageing of a pre-strained 7xxx series alloy},
url = {http://dx.doi.org/10.1016/j.ijplas.2018.02.008},
volume = {106},
year = {2018}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - 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.
AU  - Zheng,J
AU  - Lin,J
AU  - Pan,R
AU  - Lee,J
AU  - Li,C
AU  - Davies,CM
DO  - 10.1016/j.ijplas.2018.02.008
EP  - 47
PY  - 2018///
SN  - 0749-6419
SP  - 31
TI  - A novel constitutive model for multi-step stress relaxation ageing of a pre-strained 7xxx series alloy
T2  - International Journal of Plasticity
UR  - http://dx.doi.org/10.1016/j.ijplas.2018.02.008
UR  - https://www.sciencedirect.com/science/article/pii/S0749641917304849?via%3Dihub
UR  - http://hdl.handle.net/10044/1/57971
VL  - 106
ER  -
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