NDLI: Heaviside enriched extended stochastic FEM for problems with uncertain material interfaces

Content Provider	Springer Nature Link
Author	Lang, Christapher Sharma, Ashesh Doostan, Alireza Maute, Kurt
Copyright Year	2015
Abstract	This paper is concerned with the modeling of heterogeneous materials with uncertain inclusion geometry. The eXtended stochastic finite element method (X-SFEM) is a recently proposed approach for modeling stochastic partial differential equations defined on random domains. The X-SFEM combines the deterministic eXtended finite element method (XFEM) with a polynomial chaos expansion (PCE) in the stochastic domain. The X-SFEM has been studied for random inclusion problems with a $$C^0$$ -continuous solution at the inclusion interface. This work proposes a new formulation of the X-SFEM using the Heaviside enrichment for modeling problems with either continuous or discontinuous solutions at the uncertain inclusion interface. The Heaviside enrichment formulation employs multiple enrichment levels for each material subdomain which allows more complex inclusion geometry to be accurately modeled. A PCE is applied in the stochastic domain, and a random level set function implicitly defines the uncertain interface geometry. The Heaviside enrichment leads to a discontinuous solution in the spatial and stochastic domains. Adjusting the support of the stochastic approximation according to the active stochastic subdomain for each degree of freedom is proposed. Numerical examples for heat diffusion and linear elasticity are studied to illustrate convergence and accuracy of the scheme under spatial and stochastic refinements. In addition to problems with discontinuous solutions, the Heaviside enrichment is applicable to problems with $$C^0$$ -continuous solutions by enforcing continuity at the interface. A higher convergence rate is achieved using the proposed Heaviside enriched X-SFEM for $$C^0$$ -continuous problems when compared to using a $$C^0$$ -continuous enrichment.
Starting Page	753
Ending Page	767
Page Count	15
File Format	PDF
ISSN	01787675
Journal	Computational Mechanics
Volume Number	56
Issue Number	5
e-ISSN	14320924
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2015-09-05
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	X-SFEM Level set method Heaviside enrichment Polynomial chaos Uncertainty quantification Theoretical and Applied Mechanics Computational Science and Engineering Classical Continuum Physics
Content Type	Text
Resource Type	Article
Subject	Applied Mathematics Ocean Engineering Computational Theory and Mathematics Mechanical Engineering Computational Mechanics Computational Mathematics

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