Imperial College London
Portrait Picture

M H Ferri Aliabadi

Faculty of Engineering, Department of Aeronautics

Chair in Aerostructures
 
 
 
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Contact

 

+44 (0)20 7594 5077m.h.aliabadi

 
 
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Assistant

 

Miss Lisa Kelly +44 (0)20 7594 5056

 
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Location

 

CAGB323City and Guilds BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Morse:2019:10.1016/j.enganabound.2019.05.021,
author = {Morse, L and Sharif, Khodaei Z and Aliabadi, MH},
doi = {10.1016/j.enganabound.2019.05.021},
journal = {Engineering Analysis with Boundary Elements},
pages = {412--426},
title = {A dual boundary element based implicit dierentiation method for determining stress intensity factor sensitivities for plate bending problems},
url = {http://dx.doi.org/10.1016/j.enganabound.2019.05.021},
volume = {106},
year = {2019}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - A  novel  methodology  for  determining  Stress  Intensity  Factor  (SIF)  sensitivities  for  plate  bending  problemsusing the Dual Boundary Element Method (DBEM) is presented.  The direct derivatives of the DBEM integralequations for plate bending have been derived for the first time and are used as part of a DBEM-based ImplicitDifferentiation Method (IDM or DBEM-IDM) for calculating the sensitivities of SIFs to changes in differentgeometric  parameters  such  as  crack  length  and  crack  rotation  angle.   The  SIFs  and  their  sensitivities  arecalculated using the J-integral and the derivative of the J-integral respectively.  A numerical example featuringa thick plate subjected to membrane, bending, and pressure loads is presented.  In the first half of the numericalexample,  the SIF sensitivities from the IDM are compared with those obtained from the more common,  butrelatively crude, Finite Difference Method (FDM or DBEM-FDM). Results show that the IDM is a significantlymore efficient and robust alternative to the FDM. The accuracy of the FDM showed significant dependence onthe step size used, necessitating a time-consuming optimization procedure to determine the optimal step size.Once this optimal step size was found, both methods provided very similar results.  As part of the second halfof the numerical example,  a demonstration of one possible application of the SIF sensitivities from the IDMis presented.  This involved carrying out reliability analyses using the First-Order Reliability Method (FORM)with a large number of design variables.
AU  - Morse,L
AU  - Sharif,Khodaei Z
AU  - Aliabadi,MH
DO  - 10.1016/j.enganabound.2019.05.021
EP  - 426
PY  - 2019///
SN  - 0955-7997
SP  - 412
TI  - A dual boundary element based implicit dierentiation method for determining stress intensity factor sensitivities for plate bending problems
T2  - Engineering Analysis with Boundary Elements
UR  - http://dx.doi.org/10.1016/j.enganabound.2019.05.021
UR  - http://hdl.handle.net/10044/1/70556
VL  - 106
ER  -
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