LS-DYNA

For more than 100 material models, described on over 500 pages of manual are available for most different materials like steel, glass, composites, foams or rubber. A deep understanding is crucial for the correct application of the models and finally for the quality of the computational results. This seminar  gives a fundamental overview to those different material classes and material models. For usual material formulation like plasticity and visco-plasticity, the underlying theory is deepened and the application of the material models is suggested.

Theoritical basics

• Material characterization and rheological models
• Stress and strain measures during large deformations
• Spatial stress states and invariants
• Basics of elasto-plasticity theory with kinematic and isotropic hardening
• Strain rate dependency
• Compressibility and incompressibility

Material description in LS-DYNA

• Minimum data, stress-strain curves, tables
• Parameter defined material descriptions

Plasticity and visco-plasticity 

• Selected plasticity models using Von-Mises Drucker-Prager yield criterion
• Anisotropic plasticity models according to Hill and Barlat
• Possibilities to account for strain rate dependency in plasticity

Visco-elasticity

• Characterstics of models, parameter identification
• Creep models

Foams 

• Classification of foams; reversible vs. irreversible
• Similarities and differences of the models
• Problems durinig application
• Parameter identification

Rubber materials

• Characterstic properties and application areas
• 1, 2 and more parameters models
• Parameter identification using Curve-Fitting

Fibre reinforced composites

• Requisites and failure types
• Failure indicators and post-breakage models
• Linear and non-linear material models for fibre reinforced composite materials
• Algorithmic aspects and Post-processing

Material failure

• Failure criterion, mesh dependence, non-local formulations
• Element failure and contact

About LS-DYNA

LS-DYNA is a multi-purpose, explicit and implicit FEM program used to analyze linear, non-linear static and dynamic behavior of structures.  It is actively developed by the Livermore Software Technology Corporation (LSTC). For more information about LS-DYNA, please click here.