WARP3D Changelog

What's new in WARP3D 17.5.6

• The plane option of the constraints command now offers more control over the distance proximity checks and provides additional output on the distance checking. Similar improvements are included in the list command (Section 2.16).
• A new output capability that simplifies significantly the specification of analyses with many load(time) steps. A file of output commands may be defined that will be executed automatically after each step in a specified list of steps. Such automatic output can also be mixed with additional output commands given after specific load steps as in the past.
• Asymmetric equation solvers are now available for the systems of equations that derive from the crystal plasticity model. Asymmetric systems have symmetry of the non-zero locations in the as- sembled equations but non-symmetric numerical values. The asymmetric solver requires twice the amount of memory and twice the equation solving time for each global Newton iteration { the savings in solution time can arise from the reduced number of global Newton iterations. The asymmetric option is available in threads only execution via the Intel Pardiso solver direct and iterative options Section 2.10.2).
• Output strain values for solid element in finite strain/rotation analyses are now given by the summed increments of unrotated strain, delta d rotated to the fixed-global axes using R from the polar de-composition, F = RU. These values match closely those output by Abaqus which uses summed, incrementally rotated values over the loading history. See Section 1.8.6 for additional details.
• A new output capability to write at files of nodal and element results. These files have the simplest possible structure of a 2D array with no other readable information. The at files are provided in text or stream binary) forms. The text files may be read directly using Python ( loadtxt imported into Excel, Matlab, Mathematica or read easily with C, C++, Fortran programs. The stream files may be read with fromfile in Python; Matlab and Mathematica using binary stream I/O, and using standard stream operators in C, C++ and Fortran (2003 and later).
• Similar to the at results files, a new output capability is available to write a simple, flat fille for the model description. The .text file includes the number of nodes/elements, coordinates of nodes and element data (type, material assigned to element and nodes to which the element connects). The file structure is designed to be read very efficiently by Python, imported into spreadsheets, read by C, C++, ... programs. Appendix K includes sample Python programs to read this model description file and the various at results files.
• Manual Chapter 1 has been re-written, updated and expanded with a wider range of example analyses/discussion and an expanded discussion of theoretical developments implemented in the code. A new capability is available to release absolute constraints on nodes during the solution. The corresponding reactions are relaxed uniformly to zero over the specified number of load (time) steps.
• Node releases are continued across analysis restarts if required and are integrated into the adaptive step subdivision of the nonlinear solution.
• The capability to write the equilibrium equations to a file at any time during a nonlinear analysis is described in Section 2.10.16. These files may become quite large (10s GB) for large models. Moreover, users may want to read the equations for processing with C and C++ programs. The solver file now uses the access=stream capability now available in Fortran.
• The manual section on multipoint constraints is updated to clarify the more general command syntax, limitations that the equations must be homogeneous, and assumptions the WARP3D equation solver makes about dependent vs independent displacement components.