Coarsening of mesh models for representation of rigid objects in finite element analysis

Finite element modelling of processes, where geometry of the component evolves with time, usually involves checks/computations for contact between objects. Examples of these kinds of processes are sheet forming, bulk forming (forging, extrusion, rolling), etc. In some cases, it may be acceptable not to perform any speciÞc analysis on the dies and treat them as being rigid. In such cases, it is best to represent mesh models for the rigid objects with as few elements as possible. This signiÞcantly reduces the time spent by the solver in geometric checks for contact between objects. Hence, a module has been developed to read an existing discrete representation (mesh or STL facets) and coarsen it based on certain user speciÞed criteria. This module can be used as a Þlter before running the analysis. Other beneÞts of using a compact mesh model to represent the rigid object include (a) reduced memory usage by the application, (b) a smaller results database, (c) faster visualization algorithms, and (d) faster transmission of mesh model data across networks. Results from the Þnite element analysis of a forging process, performed with a commercial solver, are presented. Copyright