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Polymeric Material Modelling in LS-DYNA

With Paul Du Bois / Stefan Kolling

Duration: 2 Days

Note; this course is suitable for LS-DYNA users with at least 6 months experience of using the code.

In recent years plastic, foam-, rubber- and glue-materials have become more and more important for a large variety of industrial applications. Especially foams are widely used in the automotive industry because of their energy absorbing properties and the advantageous stiffness to density ratio. Compared to other commonly used materials as for example steel or aluminium, the material behaviour of foams is much more complex. The modelling of foams for a finite element simulation therefore represents a challenging task for the simulation expert. Rubber- and Glue-Materials are in general non-linear elastic. Especially rubber materials show a very strong rate-dependent behaviour, which has to be considered in the constitutive material formulation.

LS-DYNA offers its users a wide range of material models that have been developed exclusively for the modelling of foams and rubbers. The choice and the application of such special material models require a good basic knowledge of the theoretical as well as the numerical background. It is the objective of this seminar to give an overview of the available material models for plastics, foams, rubbers and glues in LS-DYNA and on how to apply them properly. In addition to that the theoretical background of these models will be presented.

Furthermore the topics parameter identification, experimental set-up and evaluation of experimental results will be discussed.

Small example problems will illustrate various application cases of the material models implemented in LS-DYNA.

The contents of this course does NOT extend into fibre reinforced materials although considerable time is devoted to the simulation thermoplastics.

Content:

  • Presentation of various applications
  • Discussion of the material behaviour of polymers
  • Foams
  • Appropriate material models for LS-DYNA
  • Reversible, crushable and semi-crushable foams
  • Preparation of test results and assumption in LS-DYNA
  • Rubber Materials
  • Quasi-static and dynamic behaviour
  • Incompressibility
  • Experimental set-up, data preparation
  • Parameter Identification
  • Glue Materials
  • Structural glue, installation glue, pane glue
  • Modelling of a glue line
  • Material behaviour and material modelling of glue
  • Tests for the evaluation of material parameters
  • Thermoplastics
  • Material models for small deformations
  • Material models for large deformations
  • Experimental set-up, data preparation
  • Validation and verification

Instructors:

Paul du Bois has worked as an independent consultant since 1987 and mainly does large scale industrial applications of finite element techniques. Over the years he has worked with most automotive manufacturers amongst which : DaimlerChrysler, Ford, GM, Toyota, BMW, PSA, Honda, Hyundai, Porsche, VW-Audi and Fiat.

Stefan Kolling has been responsible for methods development in the field of material modelling at the DaimlerChrysler car division in Sindelfingen, Germany for many years. His name is associated with a number of frequently used material laws in LS-DYNA such as MAT_SIMPLIFIED_RUBBER and MAT_SAMP-1.

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