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From CAD to FEA : A Design Automation Perspective

Roland Stolt (Institutionen för produkt- och produktionsutveckling, Produktutveckling)
Göteborg : Chalmers University of Technology, 2006.
[Licentiatavhandling]

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.

Nyckelord: Idealisation, CAD, Finite element analysis, mid-surfaces, KBES, Feature based modelling, knowledge based systems



Denna post skapades 2006-11-16.
CPL Pubid: 23021

 

Institutioner (Chalmers)

Institutionen för produkt- och produktionsutveckling, Produktutveckling (2005-2017)

Ämnesområden

Industriell teknik och ekonomi

Chalmers infrastruktur

Relaterade publikationer

Inkluderade delarbeten:


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


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


Reusing CAD-models of die-cast products for FEA


Examination

Datum: 2006-12-07
Tid:
Lokal:

Ingår i serie

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