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Why is my prestressed modal cyc analysis with mismatched nodes crashing in ANSYS 10.0 and 11.0?
I am getting the error message below. With this model it only seems to occur when more than
one harmonic index is requested.

*** FATAL ***
A term of constraint equation 1657 is not defined, most likely due to a displacement constraint on this or an adjoining constraint equation.


This is a current limitation of the modal cyclic symmetry capability. Development believes that<br>the use of constraints on the edge nodes contributes to the problem (Ref: Defect 29249.)

Why does this superelement use pass require so much memory?


This problem runs out of memory during symbolic assembly with the USE pass solution.<br>There are only ~2300 rows in the superelement, however the reason we run out of memory<br>is...

Why does the addition of the diode element, CIRCU125, create ill-conditioning?


Development informs that the voltage source is inherently ill-conditioned and that<br>the diode element is simply the trigger in this model. A workaround is to replace the<br>voltage...

When BFE,HGEN is applied with a table load using f(x,y,z) is xyz the centroid?


No, If the table is specified for only Val1, the value is based on the location of node i.<br>Using the test below, I found it was necessary to specify the table for Val1 through...

Why don't SHELL181 stress results match SHELL63 for this cantilevered plate benchmark?
There is about a 5% difference.


The main difference between the results is caused by SHELL181 reporting a centroidal value vs SHELL63 nodal values.<br>For this model the different between the centroidal and nodal values is...

Are orientation keypoints updated when the keypoint is merged out by NUMMRG,KP in ANSYS 10.0?


No, they are not. They will be in ANSYS 11.0, however (Ref: Defect 49166)

Could the ADAMS macro be based on a prestressed modal?


As a macro in the APDL directory, the file ADAMS.MAC can be editted<br>by the user to do this. The user would need to verify that it was working<br>properly, however.

How does the ANSYS fatigue module calculate the alternating stress difference range?


In Release 11.0. ANSYS calculates the alternating stress difference range according to the method prescribed in Section VIII, Division 2 of the ASME Boiler and Pressure Vessel Code. In that...

Does the ANSYS fatigue module use the full or the alternating stress difference range?


In Release 10.0, the ANSYS fatigue module uses alternating stress difference range.<br><br><br>! AXISYMMETRIC MODEL WITH INTERNAL PRESSURE<br>! EXPECTED...

Can you extract all of the participation factors from a modal analysis and store them as parameters?


In ANSYS Release 10.0, you can use the *GET command (*GET,PAR,MODE,,PFACT) to extract and save only the last participation factor (ROTZ) from a modal analysis. You cannot *GET any other...

Can custom BEAM sections be created in an arbitrary coordinate system?


In ANSYS, Release 10.0, the custom section must be flat and parallel to the global XY plane. However, the center does not have to be at the global origin. You can adjust the beam node location...

How to obtain relative displacement between two locations in a PSD analysis?


You cannot directly determine the relative displacement between two locations in a PSD analysis, because the signs of the displacements are not retained. One technique for obtaining relative...

What is the difference between specifying temperature using the BF or the TUNIF command?


In ANSYS Release 10.0, the BF command restrains a DOF to a specified value that cannot change during the solution. The TUNIF command is a subset of the more general BFUNIF command. It sets an...

What material properties are required for an electric field analysis using SOLID231?


In ANSYS Release 10.0, if you run a static electric field analysis using SOLID231 elements, you are performing a "pure" electric conduction analysis. Thus, permittivity is not used...

How are loads specified for axisymmetric models?


In ANSYS Release 10.0, the full 360 degree load is specified for axisymmetric models. The load is not specified on a per degree or radian basis.

How to specify modal damping using MP,DAMP?


Below is an ANSYS Release 10.0 input file for a simple damped modal example (short cantilever). The appropriate material damping for the first mode is approximately 1e-4. If the damping is too...

Is it possible to release only the torsional DOFs for a BEAM element?


In ANSYS Release 10.0, you can use ENDRELEASE command to release individual DOFs.

How to set up a multi-point response spectrum (MPRS) analysis?


Below is an ANSYS Release 10.0 input file for a multi-point response spectrum. To do a MPRS, you specify all of conditions for one excitation (type, location, direction, spectral curve, etc.) and...

Is there a hard limit for the allowable number of load steps in a multi-frame restart analysis?


In ANSYS Release 10.0, the maximum number of load steps for a multi-frame restart analysis is 9,999. If you attempt to restart from load step 10,000, ANSYS will issue the following error message,...

Is it possible to extract the maximum and minimum Equivalent (Von Mises) stress for BEAM188/189?


In ANSYS Release 11.0, it is possible to extract the maximum and minimum Equivalent stress values, but not their location. With the *GET command (*GET,PAR,SECR), you can extract the component...

How is the modal participation factor ratio calculated?


In ANSYS Release 10.0, the modal participation factor ratio for any mode is the participation factor for that mode divided by the largest participation factor for any mode.

How to modify single-layer SOLSH190 integration points?


In ANSYS Release 10.0, the number of integration points for SOLSH190 can be modified using the SECDATA and SECTYPE commands. You can associate a single-layered SOLSH190 element with a shell...

How can I loosen the too tight tolerance on FLUID130 spherical radius?
I am getting the error message below.

*** ERROR ***
Node no. 7576 of the FLUID130 Acoustic Absorbing element 17664 should
lie on a SPHERE of radius 0.8; instead lies at a radius of 0.800097109.
Ensure that the radius input through the element Real Constant
matches with that of the absorbing boundary.


There is no way to loosen the tolerance, but a workaround is to<br>move the nodes to exactly 8 inch radius with the commans below.<br>The tolerance seems overly tight, but if there is...

How are SMISC quantities reported for BEAM188?


In ANSYS Release 10.0, BEAM188 is a first order Timoshenko beam element which by default uses a linear shape function (one integration point along its length). Thus, the SMISC quantities are...

How to read character strings into an array?


In ANSYS Release 10.0, you should use the *SREAD command to read character strings into an array. In earlier ANSYS Releases, you could use the *VREAD command to read character strings. However,...