Material model based on NURBS response surfaces

Marianna Coelho, Deane Roehl, Kai Uwe Bletzinger

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


The development of new and complex models is typically required to gain an understanding of advanced materials and structures. The accuracy of a structural response obtained from finite element analysis is highly dependent on the extent to which a material model represents actual material behavior. This study proposes the application of rational surfaces to provide a smooth response surface for membrane material behavior. Constitutive material tensor is calculated by using the derivatives of rational surfaces. The surfaces possess two axes of strain and an axis of stress. The methodology is validated based on classical hyperelastic models. A set of results from an aluminum testing program illustrates the response surface construction procedure from the test results. The results indicate that it is easy to implement an extension of finite element codes to include the response surface approach based on NURBS.

Original languageEnglish
Pages (from-to)574-586
Number of pages13
JournalApplied Mathematical Modelling
StatePublished - Nov 2017


  • Material model
  • NURBS surface
  • Response surface


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