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It is possible to control the generation of ABAQUS procedure cards directly from within FEMGEN or to use the interface defaults. Where simple structural or heat transfer analyses are most commonly performed it is likely that the interface defaults are the most convenient. For more complex analyses direct control over the procedure cards may be required.
The interface creates, by default, a linear structural '*STATIC' procedure card for each step for example:
*STATIC
Where a nonlinear element type has been detected (such as gap or interface elements) the interface will create the following procedure cards:
*STATIC 0.1, 1
Where a heat load has been detected the interface will create the following procedure cards:
*HEAT TRANSFER, STEADY STATE
The above cards are suitable for ABAQUS 5.2 but note that the actual ABAQUS cards produced will depend upon the setting of the resource *.abaqus.version (see section 1.4). The ABAQUS 4.9 equivalents of the above cards would be as follows:
*STATIC 1, 1
*STATIC, PTOL=?, MTOL=? 0.1, 1
*HEAT TRANSFER, STEADY STATE 1, 1
Note that for non-linear ABAQUS 4.9 files the user will have to edit the input file to define PTOL and MTOL. This is not necessary for ABAQUS 5.2.
Direct procedure control is achieved via FEMGEN load type 'PROC-DEF'. This load type does not appear in the menus but may be defined in the same way as other loads.
The user should supply one 'PROC-DEF' load type for each FEMGEN loadcase/ABAQUS step. It is used to control which ABAQUS procedure is to be used for the step and some of the more common procedure arguments.
The first four characters of the load name are used to specify which procedure to use. The last four characters of the name may be used to differentiate between different procedures of the same type.
Example FEMGEN Command:
PROPERTY LOAD PROC-DEF name lcase_no ALL arg1 arg2 [arg3] [arg4] [arg5]
The following table indicates the load names and associated load data required for each ABAQUS procedure. It is not necessary to enter all data for a particular procedure.
FEMGEN Load name Argument No. ABAQUS Meaning BUCK *BUCKLE Procedure 1 Number of eigenvalues to be estimated. 2 Maximum eigenvalue of interest. 3 Number of Vectors used in the iteration. 4 Maximum number of iterations LBUCK *BUCKLE, EIGENSOLVER=LANCZOS Procedure 1 Number of eigenvalues to be estimated. 2 Minimum eigenvalue of interest. 3 Maximum eigenvalue of interest. 4 Block size. 5 Maximum number of block Lanczos steps. T-DI *COUPLED TEMPERATURE-DISPLACEMENT Procedure 1 Suggested initial time increment. 2 Total time period for the step 3 Minimum time increment allowed 4 Maximum time increment allowed DYNA *DYNAMIC Procedure 1 Suggested initial time increment. 2 Total time period for the step 3 Minimum time increment allowed 4 Maximum time increment allowed FREQ *FREQUENCY Procedure 1 Number of eigenvalues to be estimated. 2 Maximum frequency of interest. 3 Shift point 4 Number of Vectors used in the iteration. 5 Maximum number of iterations LFREQ *FREQUENCY, EIGENSOLVER=LANCZOS Procedure 1 Number of eigenvalues to be estimated. 2 Minimum frequency of interest. 3 Maximum frequency of interest. 4 Shift point. 5 Block size. 6 Maximum number of block Lanczos steps. GEOS *GEOSTATIC Procedure H-TR *HEAT TRANSFER Procedure 1 Suggested initial time increment. 2 Total time period for the step 3 Minimum time increment allowed 4 Maximum time increment allowed 5 Temperature change rate at steady state MOD *MODAL DYNAMIC Procedure 1 Time increment to be used. 2 Time period
FEMGEN Load name Argument No. ABAQUS Meaning RAND *RANDOM RESPONSE Procedure 1 Lower frequency limit 2 Upper frequency limit 3 Number of points 4 Bias parameter 5 Frequency scale RESP *RESPONSE SPECTRUM Procedure 1 X-direction cosine 2 Y-direction cosine 3 Z-direction cosine 4 Multiplying factor SOIL *SOILS Procedure 1 Suggested initial time increment. 2 Total time period for the step 3 Minimum time increment allowed 4 Maximum time increment allowed 5 Pore pressure change rate at steady state STAT *STATIC Procedure 1 Suggested initial time increment. 2 Total time period for the step 3 Minimum time increment allowed 4 Maximum time increment allowed 5 Load proportionality factor S-SD *STEADY STATE DYNAMICS Procedure 1 Lower frequency limit 2 Upper frequency limit 3 Number of points 4 Bias parameter 5 Frequency scale VISC *VISCO 1 Suggested initial time increment. 2 Total time period for the step 3 Minimum time increment allowed 4 Maximum time increment allowed 5 Accuracy tolerance: CETOL
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