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OVERVIEW | CAPABILITIES
Analysis Capabilities
Contact The fully automated contact analysis capability in LS-DYNA is easy to use, robust, and validated. It uses constraint and penalty methods to satisfy contact conditions. These techniques have worked extremely well over the past twenty years in numerous applications such as full-car crashworthiness studies, system/component analysis, and occupant safety analysis. Coupled thermo-mechanical contact can also be handled. Over fourty different contact options are available. These options primarily treat contact of: deformable to deformable bodies, single surface contact in deformable bodies, and deformable body to rigid body contact. Multiple definitions of contact surfaces are possible, for example: Singel Surface Contact Contact with Rigid Walls Tied Surfaces Nodes Tied to Surfaces Shell Edges Tied to Shell Surfaces Fluid-Structure Interfaces Eroding Contact Edge-to-Edge Contact Resultant Force Contact Draw Beads Contact with CAD Surfaces A special option exists for treating contact between a rigid surface (usually defined as an analytical surface) and a deformable structure. On example is in metal forming, where the punch and die surface geometries can be input as IGES- or VDA-surfaces which are assumed rigid. Another example is in occupant modeling, where the rigid-body occupant dummy (made up of geometric surfaces) contacts deformable structures such as airbags and instrument panels. Several friction models are available: Static and Dynamic Coulomb Friction Viscous Friction Pressure Dependent Friction User-Defined Friction Models Contact input is made easier by allowing contact to be defined by part identifiers, by box, or by simply including the entire model in the contact definition. 
Material Models
Element Library The lower-order finite elements in LS-DYNA are accurate, simple and efficient. For the under-integrated shell and solid elements, zero-energy modes are controlled by either an hourglass viscosity or stiffness. All elements are nearly 100% vectorized.
Beams |
