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Institut
- In Zusammenarbeit mit der Bauhaus-Universität Weimar (174)
- Graduiertenkolleg 1462 (31)
- Professur Informatik im Bauwesen (24)
- Institut für Strukturmechanik (ISM) (22)
- Professur Angewandte Mathematik (18)
- Institut für Konstruktiven Ingenieurbau (IKI) (8)
- Professur Stahlbau (4)
- Institut für Bauinformatik, Mathematik und Bauphysik (IBMB) (3)
- Professur Informatik in der Architektur (3)
- Professur Stochastik und Optimierung (3)
Schlagworte
- Computerunterstütztes Verfahren (289) (entfernen)
Advanced finite elements are proposed for the mechanical analysis of heterogeneous materials. The approximation quality of these finite elements can be controlled by a variable order of B-spline shape functions. An element-based formulation is developed such that the finite element problem can iteratively be solved without storing a global stiffness matrix. This memory saving allows for an essential increase of problem size. The heterogeneous material is modelled by projection onto a uniform, orthogonal grid of elements. Conventional, strictly grid-based finite element models show severe oscillating defects in the stress solutions at material interfaces. This problem is cured by the extension to multiphase finite elements. This concept enables to define a heterogeneous material distribution within the finite element. This is possible by a variable number of integration points to each of which individual material properties can be assigned. Based on an interpolation of material properties at nodes and further smooth interpolation within the finite elements, a continuous material function is established. With both, continuous B-spline shape function and continuous material function, also the stress solution will be continuous in the domain. The inaccuracy implied by the continuous material field is by far less defective than the prior oscillating behaviour of stresses. One- and two-dimensional numerical examples are presented.