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README.md

INP to Rad converter

Description

This Python script converts .inp format to Radioss (.rad) format. It can be used as a standalone tool or as a plugin to the OpenRadioss gui tool. It is provided “as is”, and should be considered as 'beta' today, but has been successfully tested on a wide range of explicit models and already supports most commonly used element formulations, material laws, loadings and boundary conditions. Through provision of this tool, we hope to further enhance the accessibility of OpenRadioss by enabling the use of open-source pre-processors supporting the .inp format such as PrePoMax.

Installation

You need to have a python3 installation on Linux or Windows.

  • On Windows : check python.org web site to install Python

  • On Linux, install python from your OS Repository.

    • On RedHat, CentOS, Rocky Linux

        dnf install python3
  dnf install python3-tkinter

    • On Debian, Ubuntu

        apt-get install python3
  apt install python3-tk

    install the pyinstaller package

    • On Linux as root

        pip3 install pyinstaller

    • On Windows

        pip install pyinstaller

Apply the command:

  • On Windows launch

      install.bat

  • On Linux launch as root

      install.sh

This will install the inp2rad.py into Python library collection and inp2rad[.exe] into execution directory

Supported .inp keywords and Syntax

The convertor aims to support .inp format with a good degree of flexibility, case, spacing and most special characters should be ok, use of ELSET, NSET names inside other ELSET, NSET is supported

Supported keywords: (not all sub-options necessarily supported):

*AMPLITUDE (only TABULAR, default form)

*BOUNDARY (default, SPC type and TYPE=DISPLACEMENT, TYPE=VELOCITY)

*BOUNDARY condition mappings ENCASTR, PINNED, XSYMM, YSYMM, ZSYMM

*CLOAD

*COHESIVE SECTION

*CONTACT

*CONTACT PAIR

*CONTACT PROPERTY ASSIGNMENT

*COUPLING, *DISTRIBUTING or *KINEMATIC

*DAMPING,( with ALPHA =, BETA =, for material damping)

*DENSITY

*DISTRIBUTING

*DISTRIBUTING COUPLING

*DLOAD (only GRAV type)

*ELEMENT, *TYPE=

     DCOUP3D
   
     CONN3D2, (RIGID or HINGE)

     SPRINGA

     S3
     
     S3R
     
     M3D3

     R3D3

     S4
     
     S4R
     
     R3D4
     
     M3D4R
     
     C3D4
     
     C3D6
     
     COH3D6
     
     SC6R
     
     SC8R
     
     C3D8
     
     C3D8I

     COH3D8
     
     C3D8R
     
     C3D10
     
     C3D10M

*ELSET, ELSET (GENERATE supported)

*FRICTION (with coefficient on next line)

*FRICTION, ROUGH

*HYPERELASTIC (MOONEY-RIVLIN, OGDEN, NEO HOOKE, POLYNOMIAL, REDUCED POLYNOMIAL and MARLOW (only with *UNIAXIAL TEST DATA version) forms only)

*HYPERFOAM, (with either TEST DATA or MU ALPHA PR parameters)

*INCLUDE (include files supported for input, the output .rad file will be a single merged file)

*INITIAL CONDITIONS (VELOCITY only)

*KINEMATIC

*KINEMATIC COUPLING

*MASS

*MATERIAL

*MEMBRANE SECTION

*MPC (generates spring beams)

*NODE

*NSET, NSET (GENERATE supported)

*PLASTIC

*RIGID BODY

*SHELL SECTION

*SOLID SECTION

*SUPERELASTIC

*SURFACE, TYPE=ELEMENT or TYPE=NODE

*SURFACE INTERACTION

*SURFACE INTERACTION, NAME=RADIOSS_GENERAL (special usecase to ease PrePoMax usage, existence of this will result in a global general contact)

*SYSTEM

*TIE (TYPE = NODE TO SURFACE or TYPE = SURFACE TO SURFACE)

*UNIAXIAL TEST DATA

*VISCOELASTIC, TIME = PRONY