A Geometrically Exact Isogeometric Blended Shell: Formulation, Benchmarking, and Automotive Application

Paper #:
  • 2017-01-1329

Published:
  • 2017-03-28
Abstract:
Of particular interest in the automotive industry is the effective integration between design (CAD) and analysis (CAE). Isogeometric Analysis (IGA) provides a means of accomplishing this integration since, in theory, the same mathematical description of the geometry is used in both design and analysis. Moreover, IGA has been popularized as more accurate and cost-effective than traditional finite element analysis (FEA). However, the industrial adoption and acceptance of IGA has been slow to date, primarily because of the lack of general-purpose commercial tools for isogeometric modeling and analysis. In particular, a key to the effective usage of IGA is the suitability of the native CAD data for analysis. Commercial usage of IGA requires an isogeometric toolset capable of interfacing with major CAD packages, generating analysis-suitable geometry (ASG) from CAD data, and providing superior analysis capabilities. Such a toolset must include capabilities commonly found in traditional finite element pre-processors such as the representation of complex industrial structural assemblies of parts and components joined together by fasteners, welds, and adhesives. In this paper we will discuss the results of a feasibility study which was conducted to determine whether real-world CAD models can be transitioned to state-of-the-art ASG descriptions and then analyzed directly and accurately using isogeometric analysis. For the purpose of this initial study a complex automotive hood-inner sheet metal part was selected as a testbed problem. We will discuss the techniques used to convert the hood, originally built as a trimmed NURBS surface, into an ASG format. We will then describe the results of several benchmark simulations used to assess the accuracy and robustness of structural isogeometric finite elements in comparison to standard structural finite elements found in major commercial finite element packages.
Also in:
  • SAE International Journal of Passenger Cars - Mechanical Systems - V126-6EJ
  • SAE International Journal of Passenger Cars - Mechanical Systems - V126-6
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