Imperial College London
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DrNanLi

Faculty of Engineering, Dyson School of Design Engineering

Senior Lecturer
 
 
 
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Contact

 

+44 (0)20 7594 8853n.li09 Website

 
 
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Location

 

1M03Royal College of ScienceSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Shao:2017:10.1016/j.ijmecsci.2016.11.022,
author = {Shao, Z and Li, N and Lin, J and Dean, T},
doi = {10.1016/j.ijmecsci.2016.11.022},
journal = {International Journal of Mechanical Sciences},
pages = {149--158},
title = {Formability evaluation for sheet metals under hot stamping conditions by a novel biaxial testing system and a new materials model},
url = {http://dx.doi.org/10.1016/j.ijmecsci.2016.11.022},
volume = {120},
year = {2017}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Hot stamping and cold die quenching has been developed in forming complex shaped structural components of metals. The aim of this study is the first attempt to develop unified viscoplastic damage constitutive equations to describe the thermo-mechanical response of the metal and to predict the formability of the metal for hot stamping applications. Effects of parameters in the damage evolution equation on the predicted forming limit curves were investigated. Test facilities and methods need to be established to obtain experimental formability data of metals in order to determine and verify constitutive equations. However, conventional experimental approaches used to determine forming limit diagrams (FLDs) of sheet metals under different linear strain paths are not applicable to hot stamping conditions due to the requirements of rapid heating and cooling processes prior to forming. A novel planar biaxial testing system was proposed before and was improved and used in this work for formability tests of aluminium alloy 6082 at various temperatures, strain rates and strain paths after heating, soaking and rapid cooling processes. The key dimensions and features of cruciform specimens adopted for the determination of forming limits under various strain paths were developed, optimised and verified based on the previous designs and the determined heating and cooling method [1]. The digital image correlation (DIC) system was adopted to record strain fields of a specimen throughout the deformation history. Material constants in constitutive equations were determined from the formability test results of AA6082 for the prediction of forming limits of alloys under hot stamping conditions. This research, for the first time, enabled forming limit data of an alloy to be generated at various temperatures, strain rates and strain paths and forming limits to be predicted under hot stamping conditions.
AU  - Shao,Z
AU  - Li,N
AU  - Lin,J
AU  - Dean,T
DO  - 10.1016/j.ijmecsci.2016.11.022
EP  - 158
PY  - 2017///
SN  - 0020-7403
SP  - 149
TI  - Formability evaluation for sheet metals under hot stamping conditions by a novel biaxial testing system and a new materials model
T2  - International Journal of Mechanical Sciences
UR  - http://dx.doi.org/10.1016/j.ijmecsci.2016.11.022
UR  - http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000395353700012&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
UR  - https://www.sciencedirect.com/science/article/pii/S002074031630892X
UR  - http://hdl.handle.net/10044/1/52731
VL  - 120
ER  -
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