A posteriori initial imperfection identification in shell buckling problems

The current research seeks to demonstrate that an inverse solution approach, leveraging nonlinear finite element analysis with a divide and conquer type stochastic search algorithm, can identify the presence of localized denting imperfections in cylindrical shell structures. This imperfection field...

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Vydáno v:Computer methods in applied mechanics and engineering Ročník 198; číslo 2; s. 260 - 268
Hlavní autoři: Stull, Christopher J., Earls, Christopher J., Aquino, Wilkins
Médium: Journal Article
Jazyk:angličtina
Vydáno: Kidlington Elsevier B.V 01.12.2008
Elsevier
Témata:
Buckling
Computational techniques
Exact sciences and technology
Fracture mechanics (crack, fatigue, damage...)
Fundamental areas of phenomenology (including applications)
Initial imperfections
Inverse problems
Mathematical methods in physics
Physics
Shell buckling
Solid mechanics
Stochastic search
Structural and continuum mechanics
Shell buckling
Inverse problems
Initial imperfections
Stochastic search
Probabilistic approach
Ultimate limit
Revolution shell
Modeling
Search algorithm
Inverse problem
Finite element method
Displacement measurement
Defect
Cylindrical shell
Non linear effect
Buckling
Divide and conquer method
ISSN:0045-7825, 1879-2138
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Popis
Shrnutí:The current research seeks to demonstrate that an inverse solution approach, leveraging nonlinear finite element analysis with a divide and conquer type stochastic search algorithm, can identify the presence of localized denting imperfections in cylindrical shell structures. This imperfection field identification is achieved using rather sparse displacement measurements taken at safe, service loading conditions. Both the existence and nature of the imperfection field present in a given shell structure instance are determined. These inferred imperfections are subsequently used to make reasonably accurate predictions regarding the actual shell structure strength at ultimate loading.
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ISSN:0045-7825
1879-2138
DOI:10.1016/j.cma.2008.07.009