CAD-CAE integration

CAD-CAE integration


Marco Brino, Elvio Bonisoli
Politecnico di Torino (Italy)

truck-door_fullCADtruck-door_full-Rhino60patch_stress_IGA_rev

Vision

During the product development in the field of mechanics (automotive, for example) the design-to-analysis step in Computer-Aided Engineering (CAE) is a crucial bottleneck, because the meshing operation beaks the link with the original geometry built in Computer-Aided Design (CAD) systems (and then modification on geometries are not imposed to the mesh) and the operation itself requires particular specification for obtaining an effective and reliable numerical model.

Moreover, it would be useful to the CAD technicians having the possibility of quickly check a first-approximation performance of the products before submitting the requests for detailed analysis to the CAE specialists.

Isogeometric analysis (IGA) with its interesting properties can be considered one of the most effective methods for a possible full CAD-CAE integration, but on this specific topic no ultimate tools have been developed.

 

Aim

For performing a full and consistent CAD-CAE integration, tools and automatisation of tasks, which are usually performed by researches for translating models from the native CAD environment to analysis-suitable geometries, have to be developed.

Those tools might be interesting for presenting the method in a more attractive way to design companies and software houses, for a long-term industrial application.

 

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Objectives

  • Application of trivariate multipatch NURBS-based IGA for industrial applications, in linear elasticity (static, modal analysis using Nitsche’s coupling), for defining methodologies for CAD data translation;
  • Multi-body with contact problems in dynamics;
  • Pre- and post-processing tools with GUI for a quicker, more intuitive and interactive definition of models for IGA.

Conclusions of the work

 

  • Trivariate multipatch model of an industrial truck door starting from the original geometry in native CAD environment;
  • workflow for translation from original CAD to analysis-suitable trivariate (with trim-to-trimless conversion of surfaces);
  • surface-to-volume conversion of the trimless surfaces.

 

Future works

Automatisation of the following procedures:

  • trim-to-trimless conversion;
  • surface-to-volume generation;
  • neighbour identification for automatic patch coupling;
  • contact problems in dynamics.

 

Publications

  1. Nguyen V.P., Kerfriden P., Brino M., Bordas S.P.A., Bonisoli E., “Nitsche’s method for two and three dimensional NURBS patch coupling”, Computational Mechanics, vol. 56(3), ISSN 0178-7675, 2013, pp1163-1182.
  2. Tornincasa S., Bonisoli E., Kerfriden P., Brino M., “Investigation of crossing and veering phenomena in an isogeometric analysis framework”, Topics in Modal Analysis II, vol.8, Conference Proceedings of the Society for Experimental Mechanics Series, 2014, pp361-376.
  3. Tornincasa S., Bonisoli E., Brino M., “NURBS patch coupling with Nitsche’s method for isogeometric analysis”, IDMME Conference, 2014, June 18-20, Toulouse, France.