LS-DYNA is the world's most advanced general purpose transient dynamic nonlinear finite element program. It is widely accepted as the premier analysis software package for today's most challenging engineering applications. LS-DYNA can predict how a prototype will respond to real-world events, thus minimizing the time spent in design and money spent on experimental testing. LS-DYNA is well optimized on all platforms and can also run on MPP platforms. Its accuracy has been proven through correlation with experimental data. LS-DYNA is an invaluable tool, and can save you both time and money.

"Nonlinear" means at least one (and sometimes all) of the following complications:

• Changing boundary conditions (such as contact between parts that changes over time)
• Large deformations (for example the crumpling of sheet metal parts)
• Nonlinear materials that do not exhibit ideally elastic behavior (for example thermoplastic polymers)

"Transient dynamic" means analyzing high speed, short duration events where inertial forces are important. Typical uses include:

• Automotive crash (deformation of chassis, airbag inflation, seatbelt tensioning)
• Explosions (underwater Naval mine, shaped charges)
• Manufacturing (sheet metal stamping)

There are many third party software products available for preprocessing LS-DYNA input files. LST also develops its own preprocessor, LS-PrePost, which is freely distributed and runs without a license. Licensees of LS-DYNA automatically have access to all of the program's capabilities, from simple linear static mechanical analysis up to advanced thermal and flow solving methods. Furthermore, they have full use of LS-OPT, a standalone design optimization and probabilistic analysis package with an interface to LS-DYNA.

LS-PrePost is an advanced interactive program for preparing input data for LS-DYNA and processing the results from LS-DYNA analyses. The user interface is intuitive and easy to use. All data and menus are designed in a logical and efficient way to minimize the number of mouse clicks and operations. LS-PrePost runs on all Unix/Linux workstations and MS Windows computers utilizing the OpenGL graphics standard to achieve fast rendering and XY plotting.

LS-OPT is a standalone Design Optimization and Probalistic Analysis package with an interface to LS-DYNA. The Optimization capability in LS-OPT is based on Response Surface Methodology and Design of Experiments. The D-Optimality Criterion is used for the effective distribution of sampling points for effective generalization of the design response. LS-OPT allows the combination of multiple disciplines and/or cases for the improvement of a unique design. Multiple criteria can be specified and analysis results can be combined arbitrarily using C or FORTRAN type mathematical expressions.

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