Ls-dyna keyword manual

This manual provides a detailed list of all the input keywords and options available in Radioss. View new features for Radioss Discover Radioss functionality with interactive tutorials. This manual provides details on the features, functionality, and simulation methods available in Altair Radioss. Radioss format uses the 12x extension format. This format allows running either Starter or Engine with the same file.

New and modified features in Radioss. This manual provides a list of all the model definition keywords and options available in Radioss. This manual provides a list of all the solution definition keywords and options available in Radioss. It is recommended to include this keyword. It is generally used to model incompressible rubbers, polymers, foams, and elastomers. Except for extended remarks, most information from the keyword manual is available in LS-PrePost for easy reference.

For each card type, a list of sub-types is presented in the middle right area. Each sub-type can be edited. Upon editing a sub-type, a keyword form is presented in a separate pop-up window consisting of a list of that particular of data type. The copyright is with LSTC. You may check the examples separately with the menu on the left.

For educational purposes the examples have to be modified to run properly. The description of the examples explains how to work with each example. They are provided by Dr. Art Shapiro. Art is one of the co-founders of LSTC. The different pressure-volumetric strain behaviors measured in isotropic compression versus uniaxial strain indicate shear enhanced compaction.

Source: Data curves scanned from Joy and Moxley. A variety of data sources indicates that the compressive strength of concrete increases with increasing strain rate. Rate effects are more pronounced in tension than in compression. Source: Reprinted from Ross and Tedesco. General shape of the concrete model yield surface in three dimensions. General shape of the concrete model yield surface in two dimensions in the meridonal plane.

Shear failure surface function F f. Schematic of multiplicative formulation of the shear and cap surfaces. Cap failure surface function F c. Simple cap failure surface function F c. Example two- and three-invariant shapes of the concrete model in the deviatoric plane. Relationship between beta hat and J hat. Most general form for Q 1 and Q 2. Mohr-Coulomb form for Q 1 , Q 2. Willam-Warnke form for Q 1. This cap model simulation demonstrates strain softening and modulus reduction.

Viscoplastic damage threshold r 0. Variation of dmax with stress invariant ratio. Variation of dmax with rate effects.

Schematic representation of four stress paths and their stress invariant ratios. Fracture energy integral for G f. Brittle damage fracture energy G f.

Ductile damage fracture energy G f. Brittle damage threshold G f Brittle. Ductile damage threshold G f Ductile. The fracture energy with rate effects, G vp f. Effective strain rate. Brittle rate of translation C H Brittle.