WARP3D A tool for analyzing solid objects.
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WARP3D Description

Static and Dynamic Nonlinear Analysis of Fracture in Solids Static and Dynamic Nonlinear Analysis of Fracture in Solids Note: for most up-to-date source code see Source tab. Source code always has most current version with changes after periodic releases of complete system including executables for Windows, Linux, Mac OS. The default Mercurial repository contains the current stable version of WARP3D, including bug fixes. The dev repository contains new features which are potentially untested. WARP3D is under continuing development as a research code for the solution of very large-scale, 3-D solid models subjected to static and dynamic loads. Some features in the code are oriented toward the investigation of fracture in metals include a robust finite strain formulation, a general J-integral computation facility (with inertia, thermal, face loading), interaction integrals for computation of linear-elastic fracture parameters (stress intrensity factors and T-stress), very general element extinction and node release facilities to model crack growth, nonlinear material models including viscoplastic and cyclic, cohesive elements and cohesive constitutive models, hydrogen effects on plasticity, and the Gurson-Tvergaard dilatant plasticity model for void growth. Interface for Abaqus style umat routines to easily add user-defined material modeling capability. We distribute the source code free of charge under the University of Illinois/NCSA license. Meshing and Postprocessing WARP3D uses a file-based input and output system. Other (graphical) programs are used to generate models and to post-process the results. The MSC.Software Patran, for example, is used extensively by our group for these tasks - WARP3D has built-in features to interface with Patran for model construction and post-processing through standard Patran (2.5-style) neutral files and formatted/binary files of nodal and element results. The company Quest Integrity Group offers the commerical software FEACrack which provides fully-integrated mesh generation and post-processing capabilities for complex fatigue and fracture analyses on Windows computers. FEACrack incorporates extensive, direct support for WARP3D to generate complete models containing cracks, to drive the execution of WARP3D for nonlinear analyses and to post-process results including specialized features for fracture parameters. The FEACrack software includes the latest release of the standard WARP3D distribution for Windows. The FEACrack developers collaborate with our group to provide users with fully updated access to WARP3D capabilities and have contributed source code contained in the open-source distribution. In addition, we have recently developed a tool (pat2exII) which converts a Patran neutral file and associated formatted/binary nodal/element result files into an EXODUS II file compatible with Paraview (developed by Kitware, Inc., Sandia National Laboratories, and others). As EXODUS II files are also compatible with other meshing/visualization software originated at Sandia (i.e. CUBIT) we anticipate in the future it will be possible to forgo the use of Patran and use the Sandia tools instead. However, for now the tool is only useful for post-processing and visualization and is still in testing. It is available in the Downloads section and in included in the full distribution files. Note: our research group does not have a business relationship with either MSC.Software, Quest Reliability, or Kitware. Key Modeling Features and Algorithms: * Incremental-iterative, implicit formulation with full Newton iterations * Time history integration with Newmark's beta method * Adaptive load step logic to assist global Newton iterations * Large-displacements, large-strains * Polar decomposition based, rotation neutralized finite-strain plasticity * Elastic-predictor, radial return constitutive updates * Consistent tangent moduli for fast convergence of Newton iterations * Non-global, absolute coordinate systems at nodes * Element block data architectures throughout for vector/parallel * Arbitrary rigid body contact (frictionless) * Mesh-tieing with automatic generation of multi-point constraints * User-specified multi-point constraints * Node release and element extinction for crack growth (adaptive damage accumulation) * Simplified definition of eigenstrains to model residual stresses * Functionally graded materials (linear-nonlinear) supported by definition of all material properties at structure nodes * Integrated procedures to compute J-integrals, stress-intensity factors (KI, KII, KII) and T-stress values using domain-based and interaction integral methods. J-integral methods include crack face tractions, thermal loading, dynamic effects and finite strain plasticity. * UMAT compatible interface to accommodate existing and newly developed user-defined material modeling capability. * Code is written in professional style F-90/95 (and later) with extensive internal documentation

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