Structured extended finite element methods for solids defined by implicit surfaces

Ted Belytschko (1) , Chandu Parimi (1) , Nicolas Moes (2) , Natarajan Sukumar (3) , Shuji Usui (1)

1 Northwestern University [Evanston]
2 GeM - Institut de Recherche en Génie Civil et Mécanique
3 UC Davis - University of California [Davis]

A paradigm is developed for generating structured finite element models from solid models by means of implicit surface definitions. The implicit surfaces are defined by radial basis functions. Internal features, such as material interfaces, sliding interfaces and cracks are treated by enrichment techniques developed in the extended finite element method. Methods for integrating the weak form for such models are proposed. These methods simplify the generation of finite element models. Results presented for several examples show that the accuracy of this method is comparable to standard unstructured finite element methods.

Mots clés: finite elements; structured meshes; interfaces; unit cells; representative volume elements

Domaines: Mécanique des structures [physics.class-ph]

Ted Belytschko, Chandu Parimi, Nicolas Moes, Natarajan Sukumar, Shuji Usui. Structured extended finite element methods for solids defined by implicit surfaces. International Journal for Numerical Methods in Engineering, 2003, 56 (4), pp.609-635. ⟨10.1002/nme.686⟩. ⟨hal-01734734⟩