iMechanica - software - Comments

1) Prefer C++ and

wallstedt — Sun, 12 Feb 2012 01:26:44 -0500

1) Prefer C++ and Python

2) Prefer a style that defers design decisions and allows me (or others) to change my mind -- some would call it object-oriented

3) Although it has conveniences for matrix operations, Fortran is a real problem as codes get larger; it does not scale well to large instruction sets, IMO. Many smart people will disagree with that though.

Impelemtation of material model for anisotropic hardening

Ali43 — Fri, 03 Feb 2012 07:43:47 -0500

I am a master student and should implement material model for anisotropic hardening in Abaqus.Does any one can help me through the task!!!!!

Thanks

.inp file not able to open

santhu.hpt — Wed, 01 Feb 2012 23:49:42 -0500

hi dear friends,

i am facing a problem opening an .inp file in abaqus..

i tried in abaqus commond but its shows error.

"C:\temp> abaqus j=Cohelem" press the enter but it gives abaqus is not recognised as an internal or external commond, operable pregram or batch file..

please suggest where i commint the mistake.. i am waiting for yours respose.

my mail id is santhu.rvce@gmail.com.

Regards,

Santosh

composite failure criteria

umer virk — Thu, 26 Jan 2012 04:53:15 -0500

Hi i am performing impact test of composites and i am defining composite with MAT_COMP_DAMG material which is present in material properties under inelastic damage composite and enter properties but when i carryout impact no damage is captured can any one help me

Use a Coupling Constraint

Echeban — Mon, 23 Jan 2012 11:25:28 -0500

A Coupling Constraint couples the motion of a surface to the motion of a single point, which is the reference point. Clamp the reference point. The reaction is all concentrated at the reference point.

Echeban

Description of pre-processing files

Reza Hojjati — Mon, 23 Jan 2012 09:17:50 -0500

http://aim.upv.es/doc/XFEMAbq.zip

compiler options for free format fortran

Arun Prakash — Mon, 23 Jan 2012 03:05:36 -0500

Since you do not provide much info on the compiler you are using - I shall go ahead and assume the compaq fortran compiler (for windows). I think the compiler flag for free format fortran is -free. You need to recheck this with the manual of your compiler. To enable this flag while compiling, modify this line

compile_fortran=['F90COM','/C:\MSDEV\BIN', '/GM', '/recursive', '/nologo', '/heap-arrays:1', '/include:%I']

compile_fortran=['F90COM','/C:\MSDEV\BIN', '/GM', '/recursive', '/nologo','/free', '/heap-arrays:1', '/include:%I']

This should in principle work. If it doesn't, I would suggest contacting the local Abaqus support and obtain information on modifying the environment file in windows.

Cheers

Arun

There could be hundreds of

Wieslaw Beres — Sun, 22 Jan 2012 18:42:33 -0500

There could be hundreds of reasons why you are not getting the correct answer.

At first check if you are properly recovering the total reaction force: just load the beam model at the end using a vertical force instead of using a prescribed deflection and recover the total reaction.

Wieslaw

Linking Abaqus and fortran

kawaminaii — Sat, 21 Jan 2012 15:50:59 -0500

Hi Arun Prakash

Thank you for your interesting Posts.

I have met a problem in linking abaqus and fortran90.

I don't know how to "extend the compiler options in the environment file to include free format fortran"

This is my environment file.If it is possible please extend it and resend it to my email:

Kaveh_mch@yahoo.com

Thank you.

#
#        System-Wide Abaqus Environment File
#       -------------------------------------
standard_parallel = ALL
mp_mode = MPI
mp_file_system = (DETECT,DETECT)
mp_environment_export = ('MPI_PROPAGATE_TSTP',
                         'ABA_CM_BUFFERING',
                         'ABA_CM_BUFFERING_LIMIT',
                         'ABA_ITERATIVE_SOLVER_VERBOSE',
                         'ABA_DMPSOLVER_BWDPARALLELOFF',
                         'ABA_ELP_SURFACE_SPLIT',
                         'ABA_ELP_SUSPEND',
                         'ABA_HOME',
                         'ABA_MEMORY_MODE',
                         'ABA_MPI_MESSAGE_TRACKING',
                         'ABA_MPI_VERBOSE_LEVEL',
                         'ABA_PATH',
                         'ABA_RESOURCE_MONITOR',
                         'ABA_RESOURCE_USEMALLINFO',
                         'ABAQUS_LANG',
                         'ABAQUSLM_LICENSE_FILE',
                         'ABQ_CRTMALLOC',
                         'ABQ_DATACHECK',
                         'ABQ_RECOVER',
                         'ABQ_RESTART',
                         'ABQ_SPLITFILE',
                         'ABQ_XPL_WINDOWDUMP',
                         'ABQ_XPL_PARTITIONSIZE',
                         'ABQLMHANGLIMIT',
                         'ABQLMQUEUE',
                         'ABQLMUSER',
            'CCI_RENDEZVOUS',
                         'DOMAIN',
                         'DOMAIN_CPUS',
                         'DOUBLE_PRECISION',
                         'FLEXLM_DIAGNOSTICS',
                         'FOR0006',
                         'FOR0064',
                         'LD_PRELOAD',
                         'MP_NUMBER_OF_THREADS',
                         'MPC_GANG',
                         'MPI_RDMA_NENVELOPE',
                         'MPI_SOCKBUFSIZE',
                         'MPI_WORKDIR',
                         'MPCCI_SERVER',
                         'MPCCI_INITIAL_EXCHANGE',
                         '_MPCCI_CCM_CODE_IDS',
                         '_MPCCI_CODE_IDSTRING',
                         'ABAQUS_CCI_DEBUG',
                         'NCPUS',
                         'OMP_DYNAMIC',
                         'OMP_NUM_THREADS',
            'OUTDIR',
                         'PAIDUP',
                         'PARALLEL_METHOD',
                         'RAIDEV_NDREG_LAZYMEM',
                         'ABA_SYMBOLIC_GENERALCOLLAPSE',
                         'ABA_SYMBOLIC_GENERAL_MAXCLIQUERANK',
                         'ABA_ADM_MINIMUMINCREASE',
                         'ABA_ADM_MINIMUMDECREASE',
                         'IPATH_NO_CPUAFFINITY',
                         'MALLOC_MMAP_THRESHOLD_',)

import driverUtils, os
memory='50%'

compile_cpp=['CL', '/c', '/nologo', '/W0', '/MD', '/DABQ_NTI_NET', '/DABQ_WIN86_32',
             '/TP', '/EHs', '/GS', '/DNDEBUG', '/DWIN32', '/DTP_IP', '/D_CONSOLE',
             '/DNTI', '/DFLT_LIC', '/DOL_DOC', '/D__LIB__', '/DHKS_NT',
             '/DFAR=', '/D_WINDOWS', '/O1', '/Gs', '/I%I']

compile_fortran=['F90COM','/C:\MSDEV\BIN', '/GM', '/recursive', '/nologo', '/heap-arrays:1', '/include:%I']

link_sl='cmd /c "LINK /nologo /INCREMENTAL:NO /subsystem:console /machine:X86 /NODEFAULTLIB:LIBC.LIB /NODEFAULTLIB:LIBCMT.LIB /DEFAULTLIB:OLDNAMES.LIB /DEFAULTLIB:LIBIFCOREMD.LIB /DEFAULTLIB:LIBIFPORTMD.LIB /DEFAULTLIB:LIBMMD.LIB /DEFAULTLIB:MSVCRT.LIB /DEFAULTLIB:kernel32.lib /DEFAULTLIB:user32.lib /DEFAULTLIB:advapi32.lib /FIXED:NO /dll /def:%E /out:%U %F %A %B &&mt /manifest %U.manifest /outputresource:%U;2 && del %U.manifest"'

link_exe='cmd /c "LINK /nologo /INCREMENTAL:NO /subsystem:console /machine:X86 /NODEFAULTLIB:LIBC.LIB /NODEFAULTLIB:LIBCMT.LIB /DEFAULTLIB:OLDNAMES.LIB /DEFAULTLIB:LIBIFCOREMD.LIB /DEFAULTLIB:LIBIFPORTMD.LIB /DEFAULTLIB:LIBMMD.LIB /DEFAULTLIB:SVML_DISPMT.LIB /DEFAULTLIB:MSVCRT.LIB /DEFAULTLIB:kernel32.lib /DEFAULTLIB:user32.lib /DEFAULTLIB:advapi32.lib /FIXED:NO /LARGEADDRESSAWARE /STACK:20000000 /out:%J %F %M %L %B %O && mt /manifest %J.manifest /outputresource:%J;1 && del %J.manifest"'

#
# If you are attempting to compile C++ programs using Abaqus make utility without a
# Fortran compiler installed on your machine, uncommenting the following
# link_exe command may help resolve any link errors.
#
#link_exe='cmd /c "LINK /nologo /INCREMENTAL:NO /subsystem:console /machine:X86 /STACK:20000000 /NODEFAULTLIB:LIBC.LIB /NODEFAULTLIB:LIBCMT.LIB /DEFAULTLIB:OLDNAMES.LIB /NODEFAULTLIB:LIBIFCOREMD.LIB /NODEFAULTLIB:LIBIFPORTMD.LIB /NODEFAULTLIB:LIBMMD.LIB /DEFAULTLIB:MSVCRT.LIB /DEFAULTLIB:kernel32.lib /DEFAULTLIB:user32.lib /DEFAULTLIB:advapi32.lib /FIXED:NO /LARGEADDRESSAWARE /out:%J %F %M %L %B %O && mt /manifest %J.manifest /outputresource:%J;1 && del %J.manifest"'

mp_mode = THREADS

mp_mpi_implementation = HP
mp_rsh_command = 'dummy %H -l %U -n %C'
mp_mpirun_path = {}

if os.environ.has_key('MPI_ROOT') and len(os.environ['MPI_ROOT']) > 0:
    if os.path.exists(os.path.join(os.environ['MPI_ROOT'], 'bin', 'mpirun.exe')):
        mp_mpirun_path[HP] = os.path.join(os.environ['MPI_ROOT'], 'bin', 'mpirun.exe')
else:
    mpiRoot = 'C:\\Program Files\\Hewlett-Packard\\HP-MPI'
    if os.path.exists(os.path.join(mpiRoot, 'bin', 'mpirun.exe')):
        mp_mpirun_path[HP] = os.path.join(mpiRoot, 'bin', 'mpirun.exe')
    del mpiRoot

if os.environ.has_key('CCP_HOME'):
    from queueCCS import QueueCCS
    queues['default'] = QueueCCS(queueName='share')
    queues['share'] = QueueCCS(queueName='share')
    queues['local'] = QueueCCS(queueName='local')
    queues['genxmlshare'] = QueueCCS(queueName='genxmlshare')
    queues['genxmllocal'] = QueueCCS(queueName='genxmllocal')
    del QueueCCS
    run_mode=BATCH

if mp_mpirun_path:
mp_mode=MPI

graphicsEnv = driverUtils.locateFile(os.environ['ABA_PATH'],'site','graphicsConfig','env')
if graphicsEnv:
execfile(graphicsEnv)
else:
raise 'Cannot find the graphics configuration environment file (graphicsConfig.env)'

del driverUtils, os, graphicsEnv
abaquslm_license_file="@Foad-PC"

contact may be difficult

Frank Richter — Mon, 16 Jan 2012 03:40:13 -0500

Hello,

the friction coefficient and the mesh size in the soil will determine which portions of the soil will end up inside and outside of the cylinder. Contact can be an intricate task in Abaqus. Right from the top of my head I wouldn't know how to proceed. Check for theses on the internet with appropriate keywords.

Regarding the error message check your loading procedure (STATIC, I suppose) with the keywords manual. Start with a very slow time increment and let Abaqus pick time increments of growing magnitude.

Good luck

Frank

------------------------------------------ Ruhr-University Bochum Germany

Hi Frank, Thank you very

Geotech2011 — Sat, 14 Jan 2012 18:20:10 -0500

Hi Frank,

Thank you very much for your reply. As far as I know, I can just define interaction between soil and cylinder by selecting those surfaces area which are in contact together(soil and cylinder) and because of this I thought that I have to define the soil in two parts and put the cylinder in between them. However, I'll be so grateful if you could let me know how can I be generous in defining master and slave surfaces. I should mention that my aim of this simulation is "penetration cylinder into the soil". Thank you very much for your help in advance.

Regards,

Mouri

a few hints

Frank Richter — Tue, 10 Jan 2012 08:04:16 -0500

Hello,

by defining part 1 and part 2 in that manner you are restricting the analysis. You anticipate how the process progresses and what the final configuration should look like. The soil gets compressed, indented and portions of it will be dragged down as the penetration progresses. Let Abaqus rule and decide which soil volume element ends up where.

Keep in mind that the contact surfaces will be altered. Be generous in defining the slave and master surfaces.

The message stated by Abaqus on why your simulation crumbles is not specific to your problem.

------------------------------------------ Ruhr-University Bochum Germany

Hi Hossein, Did you have

mobinya1 — Fri, 06 Jan 2012 00:53:52 -0500

Hi Hossein,

Did you have any progress in developing your model? I should do something the same, and I have problems defining threads in abaqus.

stress gradients

Frank Richter — Thu, 05 Jan 2012 05:02:33 -0500

This nuisance can be caused by

1) large stress differences between integration points within an element (high stress gradient). I recall being confronted with this problem even though my Python scripts usually pick specifically the results for a specific component of the stress tensor at a precisely defined integration point (and not any average value over the element or a non-specific value like Mises stress or the like).

2) possibly also if you have your data written to files using a Python script and loop over several output databases. I had to observe that Abaqus tends to screw up data between different simulations (i.e., provides the data from the first simulation also for the ones to be evaluated subsequently).

------------------------------------------ Ruhr-University Bochum Germany

stress gradients

Frank Richter — Thu, 05 Jan 2012 05:02:12 -0500

------------------------------------------
Ruhr-University
Bochum
Germany