Imperial College London
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DrZhushengShi

Faculty of Engineering, Department of Mechanical Engineering

Advanced Research Fellow
 
 
 
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Contact

 

+44 (0)20 7594 1806zhusheng.shi

 
 
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Location

 

705City and Guilds BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Zhang:2021:10.1016/j.ijmecsci.2020.105977,
author = {Zhang, R and Shi, Z and Shao, Z and Dean, TA and Lin, J},
doi = {10.1016/j.ijmecsci.2020.105977},
journal = {International Journal of Mechanical Sciences},
title = {A novel spatio-temporal method for determining necking and fracture strains of sheet metals},
url = {http://dx.doi.org/10.1016/j.ijmecsci.2020.105977},
volume = {189},
year = {2021}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Forming limit diagrams (FLDs) and fracture forming limit diagrams (FFLDs) have been widely used to evaluate formability of sheet metals. There are many existing methods for determining localised necking strain and fracture strain necessary to construct these diagrams, however, none has been widely accepted and applied to the range of available formability testing methods, e.g. Nakajima tests and biaxial tensile tests. In this study, a novel spatio-temporal method is proposed and developed for determining the localised necking strain and the fracture strain in deformed sheet metals. In the method, localised necking is assumed to appear at the beginning of an increasing difference between average thickness strain within two rectangular zones where localised necking occurs. The effects of dimensions of the two zones on determined localised necking strains were investigated using uniaxial tensile tests for three sheet metals: AA7075, boron steel and AA6082, and the optimal dimensions are recommended to ensure accurate determinations. In comparison with several widely used existing methods, it was concluded that the novel method has greater simplicity, stability and accuracy in determining the localised necking strains. The method was also successfully applied to determine the localised necking strain and the fracture strain for AA5754 in biaxial tensile tests and it was demonstrated to be unaffected by noise and the Portevin–Le Châtelier (PLC) effect.
AU  - Zhang,R
AU  - Shi,Z
AU  - Shao,Z
AU  - Dean,TA
AU  - Lin,J
DO  - 10.1016/j.ijmecsci.2020.105977
PY  - 2021///
SN  - 0020-7403
TI  - A novel spatio-temporal method for determining necking and fracture strains of sheet metals
T2  - International Journal of Mechanical Sciences
UR  - http://dx.doi.org/10.1016/j.ijmecsci.2020.105977
UR  - http://hdl.handle.net/10044/1/83379
VL  - 189
ER  -
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