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Altair EmployeeHello everyone
I want to run a transient analysis for my model but there is a crash in my simulation. I was wondering if you knew how to manage the following errors.
*** ERROR # 1461 ***
Card 'LOAD' is not allowed for this subcase type.
*** ERROR # 1461 ***
Card 'preptran' is not allowed for this subcase type.
Output file is in attachment.
Thank you.
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Hello everyone
Is there any tutorial for fatigue analysis with S-N (stress-life) method for a cylinder under internal cyclic pressure, please? I am trying to set up the model by using tutorial 'OS-T: 1340 Fatigue (Stress - Life) Method' in HM but some parts are not clear, as follows.
1. In table under loadcollectors, how to scale the internal cyclic pressure which is between 10 MPa and 60 MPa to have the same table in tutorial that is between -1 and 1?
2. How many cycles do I need to have in my model? In tutorial, there are 2545 cycles.
3. Which scale do I need to consider in FATLOAD? In tutorial, it is 3.
4. The cylinder is closed in its both ends, does it cause to have non-uniaxial stress? According to tutorial, S-N theory deals with uniaxial stress.
5. How to define 'sets' in the cylinder model? In tutorial, there are 8 sets as eles11, eles22, ..., eles88.
Thank you.
Hello everyone
Do you know where altair_knuckle.hm can be found, please? It is for 'Multiaxial Fatigue Analysis of a Knuckle' tutorial.
Thank you.
Here is the model.
Thank you
Hello everyone
Could you please explain why in figure below there is no result? It is for multiaxial fatigue analysis tutorial, altair_knuckle.hm. Fem file is in attachment.
Thank you.
<?xml version="1.0" encoding="UTF-8"?>
Hello everyone
Could you please let me know how to run the following tutorial in 'Learn Fatigue Analysis with Altair OptiStruct' page 87?
4.4 Tutorial: Multiaxial Fatigue Analysis of a Knuckle
I set up the model but in results, there is no fatigue contour, as shown in figure of the previous post above. Fem file of my model is in attachment above.
Thank you.
Hi
Thank you for your reply. After running OptiStruct for tutorial 'OS-4050: Optimization of a Horizontal Tail Plane', there is the following error. Please let me know how to manage it. Thank you.
In SUBCASE 3: card STATSUB references wrong type SUBCASE 2.
Make sure to reference static loadstep in linear buckling loadstep under statsub(buckling).
check the following document on page 4:
https://altairuniversity.com/wp-content/uploads/2014/02/Linear-Buckling.pdf
Share the model if the problem persists
Thank you for your reply. Please find attached fem file and let me know how to manage the problem. The model has been created in HW 2017.2.
Thank you.
The problem was that linear buckling loadstep (ID 3) was referencing a linear buckling loadstep (ID 2), which is invalid because STATSUB(BUCKLING) can only reference a static subcase.
Basically the loadstep ID 3 (buck_buck_pressure_only) is the same as ID 2, therefore is redundant and should be deleted.
I also suggest you rename load collectors and loadsteps as they share names and it is easily confused.
Please refer below post.
https://community.altair.com/community?id=community_question&sys_id=86864c3a1b2bd0908017dc61ec4bcb87
Note: If possible, please create new post for new topic.
Hi @Question
Not sure where the load card is coming from.
Can you please check the loadstep and see if there is any LOAD referenced?
If you still face the problem, please share the model file.