Imperial College London
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ProfessorLeroyGardner

Faculty of Engineering, Department of Civil and Environmental Engineering

Professor of Structural Engineering
 
 
 
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Contact

 

+44 (0)20 7594 6058leroy.gardner

 
 
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Location

 

435Skempton BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Zhang:2022:10.1016/j.engstruct.2022.114857,
author = {Zhang, R and Meng, X and Gardner, L},
doi = {10.1016/j.engstruct.2022.114857},
journal = {Engineering Structures},
pages = {1--14},
title = {Shape optimisation of stainless steel corrugated cylindrical shells for additive manufacturing},
url = {http://dx.doi.org/10.1016/j.engstruct.2022.114857},
volume = {270},
year = {2022}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Axially compressed circular cylindrical shells with large diameter-to-thickness ratios are highly susceptible to local buckling, and their load-carrying capacities are known to be very sensitive to initial geometric imperfections. Hence, severe knock-down factors on their theoretical buckling loads are typically prescribed in design specifications, which greatly impair their structural efficiency. With the aim of enhancing load-bearing resistance and reducing sensitivity to imperfections, the shape optimisation and assessment of compressed free-form wavy cylindrical shells, the realisation of which is now viable through additive manufacturing, are the subject of the present study. The adopted optimisation framework employs the Particle Swarm Optimisation (PSO) algorithm, integrating computer-aided geometric design, nonlinear numerical simulations and imperfection sensitivity analyses. The structural performance of the optimised free-form wavy shells is analysed and compared to that of reference circular shells, as well as other types of non circular shell profiles, including sinusoidally corrugated shells, Aster shells and stringer-stiffenedshells. The optimised free-form wavy shell profiles are shown to exhibit increases in ultimate stress of up to 136% compared with the reference circular shell profiles; in general, greater benefits are achieved for more slender cross-sections. In future work, the proposed optimised shells will be manufactured in stainless steel by means of powder bed fusion (PBF), and their structural performance will be further verified through physical experiments. Keywords: Additive manufacturing; Axial compression; Corrugated cylindrical shells; Imperfection sensitivity; Particle Swarm Optimisation (PSO); Shell buckling; Stainless steel; 3D printing.
AU  - Zhang,R
AU  - Meng,X
AU  - Gardner,L
DO  - 10.1016/j.engstruct.2022.114857
EP  - 14
PY  - 2022///
SN  - 0141-0296
SP  - 1
TI  - Shape optimisation of stainless steel corrugated cylindrical shells for additive manufacturing
T2  - Engineering Structures
UR  - http://dx.doi.org/10.1016/j.engstruct.2022.114857
UR  - https://www.sciencedirect.com/science/article/pii/S0141029622009385?via%3Dihub
UR  - http://hdl.handle.net/10044/1/99312
VL  - 270
ER  -
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