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{Zheng:2017:10.1007/s00170-017-0121-8,
author = {Zheng, K and Lee, J and Politis, DJ and Li, N and Lin, J and Dean, TA},
doi = {10.1007/s00170-017-0121-8},
journal = {International Journal of Advanced Manufacturing Technology},
pages = {481--495},
title = {An analytical investigation on the wrinkling of aluminium alloys during stamping using macro-scale structural tooling surfaces},
url = {http://dx.doi.org/10.1007/s00170-017-0121-8},
volume = {92},
year = {2017}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Structural surface texturing is believed to be a promising approach to modify tribological and thermal performances of tooling for sheet-stamping processes. However, a fundamental study on the surface-texturing design and resulting material deformation is currently lacking. In this paper, an advanced analytical buckling model specifically for the utilisation of textured tools at macro-scale, comprising dislocation-driven material model, isotropic yield criteria, bifurcation theory and Donnell-Mushtari-Vlasov (DMV) shell structure theory, was established. The developed analytical buckling model was validated by cylindrical deep-drawing experiments. Further finite element (FE) simulations with the implementation of material model via user-defined subroutine were also used to validate the bucking model for large surface texture designs. Effects of theoretical assumptions, such as yield criterion, boundary condition and test-piece geometry, on the accuracy of model prediction for wrinkling were investigated. It was found that the von Mises yield criterion and hinged boundary condition exhibited more accurate predictions. In addition, the DMV shell theory made this model most representative for large structural texturing designs. Furthermore, the implementation of induced shear strain component has an important effect on precisely predicting the wrinkling occurrence. The advanced analytical models developed in this study combine various classical mechanics, structure stability and material modelling together, which provides a useful tool for tooling engineers to analyse structural designs.
AU  - Zheng,K
AU  - Lee,J
AU  - Politis,DJ
AU  - Li,N
AU  - Lin,J
AU  - Dean,TA
DO  - 10.1007/s00170-017-0121-8
EP  - 495
PY  - 2017///
SN  - 0268-3768
SP  - 481
TI  - An analytical investigation on the wrinkling of aluminium alloys during stamping using macro-scale structural tooling surfaces
T2  - International Journal of Advanced Manufacturing Technology
UR  - http://dx.doi.org/10.1007/s00170-017-0121-8
UR  - http://hdl.handle.net/10044/1/53247
VL  - 92
ER  -
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