SIMPACT is a finite element computer system developed at the International Center for Numerical Methods in Engineering (CIMNE) in Barcelona, Spain, for analysis of structures subjected to dynamic and impact loading. Typical application of SIMPACT include among others the seismic analysis of structures, the study of structures subjected to internal of external vibrations, the prediction of ship motions originated by waves crashworthiness studies in automobiles, aerospace and maritime vehicles, analysis of structures subjected to blast pressure loading and a wide range of impact problems typical of defense applications.
Reliable computational procedures to predict the deformation of a structure under dynamic impact loading are very complex since consideration must be given to the nonlinearity of the material, as well as other important effects like the unsteady nature of the process, the large magnitude of the strains involved and the importance of frictional effects at the contact interfaces. These analyses justify the use of sophisticated numerical methods and usually lead to the necessity for huge computer resources.
SIMPACT allows accurate computation of the geometrical and mechanical parameters of interest for the dynamic analysis of structures; these include the evolution of the deformation of the structure, the distribution of stresses and strains in the structure, and the frictional contact forces at every instant of the deformation process.
The requirements for the computer simulation of structural dynamic and impact problems using standard implicit codes typically demand significant memory requirements and computer power. The finite element formulation of SIMPACT is based on alternative explicit dynamic integration scheme. Among the distinct advantages of an explicit code are the memory requirements that are typically one order of magnitude less than the implicit case. Also non-linear effects and frictional conditions can be treated in a simpler manner allowing the solution of structural problems of practical size on standard workstations and PC’s.
SIMPACT is equipped with full graphic pre and post-processing tools which facilitate the preparation of geometry analysis data and visualization of results in a user friendly, menu driven environment.
All elements have been developed specifically for explicit dynamic applications
The following pictures show examples of application of SIMPACT to the following problems: