Classroom-Seminar:
Material modeling with LS-DYNA

The participants get insight into the theory of different material models of LS-DYNA. Frequently used material laws and material classes are discussed and hints for the application are given as well as for material parameter identification.

• Theoretical basics
• Material characterization and rheological models
• Stress and strain measures during large deformations
• Spatial stress states and invariants
• Basics of the elasto-plasticity theory with kinematc and isotropic hardening
• Strain rate dependency
• Compressability and incompressability

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

• Visco-elasticity
• Characteristics of the models, parameter identification
• Creep models

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

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

• Fiber reinforced composites
• Requisites and failure types
• Failure indicators and post-breakage models
• Linear and non-linear material models for fiber reinforced composite materials
• Algorithmic aspects and Post-Processing

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

A large number of material models are available for users of LS-DYNA. Far more than 100 material models, described on over 500 pages of the 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.