Subject: can Abaqus run elements with tetracollapse of 0.00 - msg#00268

Previous Message by Date: click to view message preview

Re: User subroutine in C++

Attached is previous abaqus response to this query: Question Is it possible to write user subroutines for ABAQUS/Standard in C++? Answer (The following applies to versions 6.3-1 and higher.) It is possible to write user subroutines for ABAQUS/Standard in C++, but it is generally recommended that user subroutines be written in Fortran. The interface for each of the user subroutines in ABAQUS/Standard is in Fortran, and the use of another programming language adds an additional layer of complexity to the programming task. The procedure for calling a C++ function from a Fortran application is machine dependent, and requires an expert knowledge of compilers and operating system conventions. Among the items that must be understood are: Mapping external C++ names to external Fortran names Mapping C++ data types to Fortran data types Conventions for inter-language procedure calls In the example outlined below, a simple user subroutine in C++ will be used in an ABAQUS/Standard analysis. To avoid platform dependencies, certain macros in the C++ subroutine have been defined. A function to transfer character arrays between Fortran and C++ has also been defined. Please note that this approach is not supported- ABAQUS, Inc will not provide technical support for this approach and associated bugs, if any, will not necessarily be fixed. To illustrate this procedure we provide a variation of the analysis in Section 2.2.7 of the Version 6.3 ABAQUS Verification Manual, "Transient internal pressure loading of a viscoelastic cylinder." The files visco_dload.inp, viscocylinder.for and visco.C are attached to this answer and available for download. To run the analysis with the C++ subroutine, complete the following steps: Obtain the C++ compile command used by ABAQUS. On the command line type: abaqus info=env > env.txt In the file env.txt look for the string 'compile_cpp'. Some examples of the output on different platforms include: Windows compile_cpp='cl /c /nologo /W0 /MD /TP /DNDEBUG /DWIN32 /DTP_IP /D_CONSOLE /DNTI /DFLT_LIC /DOL_DOC /D__LIB__ /DHKS_NT /DFAR= /D_WINDOWS /O1 /I%I' IBM AIX compile_cpp='xlC -c -qsrcmsg -q64 -qarch=pwr3 -qtune=pwr3 -DRS6000 - DCPLUS_IMPLEMENTED -D_LARGE_FILES -D_LARGE_FILES_API -DHAS_INT64 - DBIT64 -DMULTI_THREADING_ENABLED -DTHREADED_SOLVER -DIBM - DSPIN_YIELD -O3 -qstrict' SGI compile_cpp='CC -mips4 -64 -avoid_gp_overflow -c -DORIGIN2000 - DSGI8000 -DSGI -DBIT64 -DFOR_TRAIL -DCPLUS_IMPLEMENTED -DNATIVE64 - TARG:processor=r10000 -O3 -TENV:X=0 -I%I' HP compile_cpp='aCC +DA2.0W +DS2.0a -c -DHP -DHP11 -DFOR_TRAIL - DCPLUS_IMPLEMENTED -DSWAPPED -ext -DBIT64 +O2 +Olibcalls -I%I' Compaq compile_cpp='cxx -c -std arm +inst_none -nopt - distinguish_nested_enums -nodemangle -assume noaligned_objects -DDEC - DHKS_DEC -DFOR_TRAIL -DDEC_ALPHA -DHKS_OPEN_GL -DCPLUS_IMPLEMENTED - D_OSF_SOURCE -I/usr/include/X11R6 -I/opt/graphics/OpenGL/include - DTYPENAME= -D_POSIX_SOURCE -D_XOPEN_SOURCE -DSPECIALIZE -I%I' Compile the C++ user subroutine with the command found in Step 1. Run the analysis with the C++ object file. Windows abaqus -j visco_dload -user visco.obj UNIX abaqus -j visco_dload -user visco.o On certain UNIX platforms you will need to specify the correct flag to link in the C++ libraries. First, obtain the applicable link command used by ABAQUS by typing: abaqus info=env | grep link_sl Modify the commands as follows, with the new flag shown in red: IBM AIX link_sl='xlf_r -q64 -bM:SRE -bE:export.def -bnolibpath -bnoentry -o % U %F %A %B -lxlsmp -lxlf -lxlf90 -lm -lC' Compaq link_sl='cxx -shared -Wl,-error_unresolved -Wl,-soname,%U -o %U %F - Wl,-input,%E %A %B -lUfor -lfor -lm -lc' The modification must be made to the link_sl command shown in your environment file. For additional information see: 'User Subroutines,' Section 24.1.1 of the Version 6.3 ABAQUS/Standard User's Manual --- In ABAQUS@xxxxxxxxxxxxxxx, "D'Arconte, Rich" <Rich.Darconte@xxxx> wrote: > Will ABAQUS run with a user subroutine written in C++ rather than FORTRAN? > If so, are there any special requirements for linking or for passing data > back to ABAQUS, etc.? I have not found anything in the manuals covering > this issue. Thanks in advance. > > 0000 > Rich D'Arconte > Assistant Principal Engineer > Aerojet > 703-754-5083 (voice mail) > 703-754-5638 (fax) > 0000 > > DISCLAIMER: This email message and any attachments are for the sole use of > the intended recipient and may contain proprietary and/or confidential > information which may be privileged or otherwise protected from disclosure. > Any unauthorized review, use, disclosure or distribution is prohibited. If > you are not the intended recipient, please destroy the original message and > any copies of the message as well as any attachments to the original > message. ------------------------ Yahoo! Groups Sponsor ---------------------~--> Buy Ink Cartridges or Refill Kits for your HP, Epson, Canon or Lexmark Printer at MyInks.com. Free s/h on orders $50 or more to the US & Canada. http://www.c1tracking.com/l.asp?cid=5511 http://us.click.yahoo.com/mOAaAA/3exGAA/qnsNAA/PMYolB/TM ---------------------------------------------------------------------~->

Next Message by Date: click to view message preview

Re: Parameter Identification

Hi, I have previosuly used ZOPT (part of Zebulon) to determine material property data, however any structured optimization tool should do the trick. Use the *INPUT card to define a separate file which contains the *MATERIAL,USER constants. Defien these parametrically, and use whatever tool is available to perform the optimisation (I quite like the FREE tool from SANDIA labs called DAKOTA. I have previously used another crystal routine based on schmidt theory, any chance i could obtain a copy of your umat and user manual? Barry --- In ABAQUS@xxxxxxxxxxxxxxx, Amir Siddiq <amirsiddiq2001@xxxx> wrote: > well as the matter of fact for each class of hardening > (isotropic and kinematic hardening). Prof. Cailletaud > has introduced a no. of parameters and even they are > using an optimization code themselves. They have built > their own FEA package known as Zubelon and this > optimization tool is included in it (but it > costs...:)) > But using that code is quite easy as you just have to > specify which parameters you want to optimize and > after each simulation the optimization code does it by > itself and at the end user just have to read the set > of parameter which has the minimum cost function. > MATLAB seems to be a choice too...does anyone has any > prior knowledge about it? > > Regards, > Aamir > > --- Shiladitya Basu <basus@xxxx> wrote: > > > I am using crystal plasticity model [Cailletaud] > > which > > > is a phenomenological model and requires an > > > optimization tool for the identification process. > > As > > > for each slip system it has approx. 9-11 > > parameters > > > which basically control the isotropic hardening, > > > kinematic hardening etc... for each slip system. > > > Therefore in order to identify parameters for such > > > kind of model an optimization tool seems to be > > > necessary. > > > > ...shouldn't the model itself provide directions as > > to how to determine any > > parameters necessary ? I am just thinking out loud. > > Matlab can be used for optimization, but details are > > beyond my knowledge. > > > > > ********************************************************************** **** > > * DON'T CHANGE YOUR MIND TO ACHIEVE > > HARMONY * > > * > > * > > * SHILADITYA BASU 1320 > > BEAL AVENUE * > > * DOCTORAL CANDIDATE (STRUCTURES) ANN > > ARBOR, MI-48109 * > > * DEPT. OF AEROSPACE ENGINEERING > > (734)-764-4319 * > > * UNIVERSITY OF MICHIGAN > > shiladityab@xxxx * > > * FRANCOIS-XAVIER BAGNOUD BLDG > > basus@xxxx * > > * > > * > > > ********************************************************************** **** > > > > > __________________________________ > Do you Yahoo!? > Yahoo! Finance Tax Center - File online. File on time. > http://taxes.yahoo.com/filing.html

Previous Message by Thread: click to view message preview

Re: Re: debugging code linked to ABAQUS umat

Bednarcyk I noticed that you mentioned in your message that you were able to link and run a UMAT that is using another subroutine that you have as a .dll. I was trying to do something similar some time ago but I could'n even link it. Can you please comment on what changes you did to the .env file in order to link it?. This may be very useful because then I can make use of other subroutines like the ones from IMSL librariies for instance. Thanks a lot Juan Gomez --- bednarcyk <bednarcyk@xxxxxxxxx> wrote: > Thanks for the suggestions, Fernando. Abaqus support actually > got > back to me and had an online answer. It is available from the > > abaqus web site, answer ID 820. There are several > abaqus-specific > hoops to jump through, but I finally did get it to work. > > --- In ABAQUS@xxxxxxxxxxxxxxx, "fernandocachonerin" > <atila@xxxx> > wrote: > > Hi, > > > > > I have a large fortran code as a .dll, > > > called by umat, that I have successfully linked and run, > not > only > > > from the ABAQUS command line, but also from within the > visual > studio > > > environment. I can even run it through the debugger in > visual > > > studio. > > > > Maybe you need to set the first breakpoint in the umat code > first, > > then step to the function you want to debug. If this doesn't > work, > try > > compiling the dll you want to debug into a static library > instead > (a > > *.lib). You should then be able to step into the functions > from the > > top-level debug file (your umat subroutine). You might need > to set > a > > breakpoint in the umat file though, for the debugger to "get > it". > > > > Of course I am assuming that you compiled your dll with > debugging > > symbols on... > > > > Hope this helps, > > > > Fernando > > > ===== JUAN GOMEZ 188 KENVILLE RD APARTMENT D BUFFALO, NY 14215 (716)836-0107 __________________________________ Do you Yahoo!? Yahoo! Finance Tax Center - File online. File on time. http://taxes.yahoo.com/filing.html ------------------------ Yahoo! Groups Sponsor ---------------------~--> Buy Ink Cartridges or Refill Kits for your HP, Epson, Canon or Lexmark Printer at MyInks.com. Free s/h on orders $50 or more to the US & Canada. http://www.c1tracking.com/l.asp?cid=5511 http://us.click.yahoo.com/mOAaAA/3exGAA/qnsNAA/PMYolB/TM ---------------------------------------------------------------------~->

Next Message by Thread: click to view message preview

Re: can Abaqus run elements with tetracollapse of 0.00

Hi, Anyone has answers for my query. "can Abaqus run elements with tetracollapse of 0.00" regards, SPH ----- Original Message ----- From: Haridas S.P. To: ABAQUS@xxxxxxxxxxxxxxx Sent: Thursday, March 25, 2004 1:17 PM Subject: [ABAQUS] can Abaqus run elements with tetracollapse of 0.00 Hi Friends, I have a query ' can Abaqus run elements with tetracollapse of 0.00'. Please let me know, regards, SPH [Non-text portions of this message have been removed] Community email addresses: Post message: ABAQUS@xxxxxxxxxxxxxxx Subscribe: ABAQUS-subscribe@xxxxxxxxxxxxxxx Unsubscribe: ABAQUS-unsubscribe@xxxxxxxxxxxxxxx List owner: ABAQUS-owner@xxxxxxxxxxxxxxx Shortcut URL to this page: http://groups.yahoo.com/group/abaqus Yahoo! Groups Links [Non-text portions of this message have been removed]