Imperial College London
Portrait Picture

Dr Adam Jan Sadowski

Faculty of Engineering, Department of Civil and Environmental Engineering

Senior Lecturer
 
 
 
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Contact

 

+44 (0)20 7594 3065a.sadowski Website

 
 
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Location

 

318Skempton BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Fajuyitan:2018:10.1177/1369433218804928,
author = {Fajuyitan, OK and Sadowski, AJ},
doi = {10.1177/1369433218804928},
journal = {Advances in Structural Engineering: an international journal},
pages = {2433--2453},
title = {Imperfection sensitivity in cylindrical shells under uniform bending},
url = {http://dx.doi.org/10.1177/1369433218804928},
volume = {21},
year = {2018}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Efforts are ongoing to characterise a comprehensive resistance function for cylindrical shells under uniform bending, a ubiquitous structural system that finds application in load-bearing circular hollow sections, tubes, piles, pipelines, wind turbine support towers, chimneys and silos. A recent computational study by Rotter et al. demonstrated that nonlinear buckling of perfect elastic cylinders under bending is governed by four length-dependent domains –‘short’, ‘medium’, ‘transitional’ and ‘long’– depending on the relative influence of end boundary conditions and cross-sectional ovalisation. The study additionally transformed its resistance predictions into compact algebraic relationships for use as design equations within the recently developed framework of reference resistance design. This article extends on the above to present a detailed computational investigation into the imperfection sensitivity of thin elastic cylindrical shells across the most important length domains, using automation to carry out the vast number of necessary finite element analyses. Geometric imperfections in three forms – the classical linear buckling eigenmode, an imposed cross-sectional ovalisation and a realistic manufacturing ‘weld depression’ defect – are applied to demonstrate that imperfection sensitivity is strongly length dependent but significantly less severe than for the closely related load case of cylinders under uniform axial compression. The axisymmetric weld depression almost always controls as the most deleterious imperfection. The data are processed computationally to offer an accurate yet conservative lower-bound algebraic design characterisation of imperfection sensitivity for use within the RRD framework. The outcomes are relevant to researchers and designers of large metal shells under bending and will appeal to computational enthusiasts who are encouraged to adopt the automation
AU  - Fajuyitan,OK
AU  - Sadowski,AJ
DO  - 10.1177/1369433218804928
EP  - 2453
PY  - 2018///
SN  - 1369-4332
SP  - 2433
TI  - Imperfection sensitivity in cylindrical shells under uniform bending
T2  - Advances in Structural Engineering: an international journal
UR  - http://dx.doi.org/10.1177/1369433218804928
UR  - https://journals.sagepub.com/doi/10.1177/1369433218804928
UR  - http://hdl.handle.net/10044/1/64762
VL  - 21
ER  -
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