From CAD to FEA : A Design Automation Perspective
Licentiatavhandling, 2006

CAD-models of parts produced by injection moulding or die casting are often complex making the task of automated geometrical idealisation for finite element analysis difficult. Conventional tools for geometric idealisation are not ideal for the task as will be shown in the thesis. To address the idealisation problem this thesis proposes a novel method of creating geometric idealisations of CAD-models for finite element analysis. Knowledge about the production and design processes is used to support the idealisations. The key idea is simplify the idealisation problem by using the fact that die-cast and injection-moulded parts have a clearly defined tooling draft direction. It is primarily the mid-surfaces of the thin-walled geometry that are extracted for shell element meshing. The ideas have been tested by the creation of a CAD-integrated system which reads the construction history tree of the CAD-model and creates an idealised geometry in the same CAD-model automatically. It is also shown how the system can be used for idealising neutral format files by creating a virtual construction history tree in interaction with the user. The system is named CASTING (CAd Supported Tool for Idealisation of Geometry). The overall objective is to save time in the idealisation step freeing time for more creative work in the design process.

Finite element analysis

Feature based modelling

Idealisation

CAD

KBES

mid-surfaces

knowledge based systems

Författare

Roland Stolt

Chalmers, Produkt- och produktionsutveckling, Produktutveckling

A CAD-INTEGRATED SYSTEM FOR AUTOMATED IDEALIZATION OF CAD-MODELS FOR FINITE ELEMENT ANALYSIS

IDETC/CIE ASME Long Beach CA. USA 2005,; (2005)

Paper i proceeding

AUTOMATIC PREPARATION OF CAD-GENERATED SOLID GEOMETRY FOR FE-MESHING

NAFEMS World Congress, Malta 2005,; (2005)

Paper i proceeding

Reusing CAD-models of die-cast products for FEA

NAFEMS seminar: Prediction and modelling of failure using FEA 2006, Copenhagen / Roskilde Denmark, NAFEMS.,; (2006)

Paper i proceeding

Ämneskategorier

Produktionsteknik, arbetsvetenskap och ergonomi

Research series from Chalmers University of Technology, Department of Product and Production Development: report: 13