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{Zhu:2022:10.3390/ma15249072,
author = {Zhu, L and Wang, X and Sun, L and Hu, Q and Li, N},
doi = {10.3390/ma15249072},
journal = {Materials},
pages = {1--26},
title = {Optimisation of selective laser melted Ti6Al4V functionally graded lattice structures accounting for structural safety},
url = {http://dx.doi.org/10.3390/ma15249072},
volume = {15},
year = {2022}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - This paper presents a new framework for lightweight optimisation of functionally graded lattice structures (FGLSs) with a particular focus on enhancing and guaranteeing structural safety through three main contributions. Firstly, a design strategy of adding fillets to the joints of body-centred cubic (BCC) type lattice cells was proposed to improve the effective yield stress of the lattices. Secondly, effective properties of lattice metamaterials were experimentally characterised by conducting quasi-static uniaxial compression tests on selective laser melted specimens of both Ti6Al4V BCC and filleted BCC (BCC-F) lattices with different relative densities. Thirdly, a yield stress constraint for optimising FGLSs was developed based on surrogate models quantifying the relationships between the relative density and the effective properties of BCC and BCC-F lattices developed using experimental results assisted by numerical homogenisation. This framework was tested with two case studies. Results showed that structural safety with respect to avoiding yield failure of the optimised FGLSs can be ensured and the introduction of fillets can effectively improve the strength-to-weight ratio of the optimised FGLSs composed of BCC type lattices. The BCC-F FGLS achieved 14.5% improvement in weight reduction compared with BCC FGLS for the Messerschmitt-Bölkow-Blohm beam optimisation case study.
AU  - Zhu,L
AU  - Wang,X
AU  - Sun,L
AU  - Hu,Q
AU  - Li,N
DO  - 10.3390/ma15249072
EP  - 26
PY  - 2022///
SN  - 1996-1944
SP  - 1
TI  - Optimisation of selective laser melted Ti6Al4V functionally graded lattice structures accounting for structural safety
T2  - Materials
UR  - http://dx.doi.org/10.3390/ma15249072
UR  - https://www.mdpi.com/1996-1944/15/24/9072
UR  - http://hdl.handle.net/10044/1/102254
VL  - 15
ER  -
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