DISCLAIMER lMs report was prepared as an account of work s p o~~~o m i by an agency of the United States Government Neither the United States Government nor any agency thereof, nor any of their employees, make any warranty, express or implied, or asumes any legal liability or nsponsiibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disdosed, or represents that its use wwld not infringe privately owned rights. Refemce herein to any specific commerdal product, procgs, or sem'ce by trade name, trademark, manufacturer, or otkrwise does not necessariy~comtitute or imply its endorsement, recoinmedab 'on, or hvoring by the United Stab Government or any agency thereof. The views and opinions of authors expressed herein do not necsarily state or reflect those of the United Stats Government or any agency thereof.. DISCLAIMER Portions of this document may be illegible in electronic image products. Images are produced from the best available original document. .

No abstract

A closed-form solution is given for the way stresses evolve during an elastoplastic time step under conditions of purely kinematic hardening or softening. When isotropic effects are included, the analysis becomes more difficult, so a perturbation solution is developed. These solutions are then compared with various algorithms commonly used in finite element programs in order to assess the trade-offs between accuracy and computational efficiency.

No abstract

This manual describes in detail the solution of ten example problems using the explicit nonlinear finite element code DYNA3D. The sample problems include solid, shell, and beam element types, and a variety of linear and nonlinear material models. For each example, there is first an engineering description of the physical problem to be studied. Next, the analytical techniques incorporated in the model are discussed and key ' features of DYNA3D are highlighted. INGRID commands used to generate the mesh are listed, and sample plots from the DYNA3D analysis are given. Finally, there is a description of the TAURUS post-processing commands used to generate the plots of the solution. This set of example problems is useful in verifying the installation of DYNA3D on a new computer system. " In addition, these documented analyses illustrate the application of DYNA3D to a variety of engineering problems, and thus this manual should be helpful to new analysts getting started with DYNA3D.