Fatugue Analysis S-N Method
Altair EmployeeI want to run a Fatigue Analysis using the S-N Method.
First i tried the S-N tutorial from the OptiStruct_14.0_Tutorials PDF starting at page 251 and it worked perfectly well.
Now i want to run the same type of Analysis with a different model and other parameters. Therefor i got some questions.
First of all i created an own .csv document with a new amplitude. the first problem is, that i need to run 2.000.000 steps but only made 333.333 Steps in my .csv data, so i need to
repeat my sequence 6 times in a single Solver run to reach this 2.000.000 times. So i need to know how to set this up.
The second problem is the material. In the tutorial the material used is aluminium, but i need to use steel in my analysis. Therefor i need to type in some values, such as: UTS, SRI1, B1, NC1 and SE. Could anybody tell me what those shortcuts mean and where i could get my values from for those shortcuts for steel.
My last question is if there is a pdf where i can check up all the shortcuts used in Hyperworks, because there are some which weren`t explained during the tutorial.
I would be very pleased if someone could help me quickly, because i need those information's for my study's.
Greetings
Christian
Answers
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Altair Forum User said:
repeat my sequence 6 times in a single Solver run to reach this 2.000.000 times. So i need to know how to set this up
Is this a continuous event?
Altair Forum User said:UTS, SRI1, B1, NC1 and SE
UTS is the ultimate tensile strength of the material. Rest you can get from SN curve (if you have data). See the image below:
Altair Forum User said:My last question is if there is a pdf where i can check up all the shortcuts used in Hyperworks, because there are some which weren`t explained during the tutorial.
Please refer OptiStruct user guide.
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Hello Prakash Pagadala,
thank you for your helpful Answers. The amplitude of the event has following parameters: 6Hz, max. Y= 1, min Y= -1, n=2.000.000
From the Image you posted of the S-N curve i can see every shortcut except for SE. Could you tell me where to get that value from ?
I would be very happy if you could tell me how tho realize the 2.000.000 steps.
Greetings
Christian J.
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Hi Christian,
SE is the error offset which is something you get from comparison.
If you want to repeat the load time, take a look at the tutorial available in OptiStruct help using Fatigur Process Manager
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Fatigue Process Manager (FPM) using S-N (Stress - Life) Method
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SN curve set value for steel material
SRI1 ?
B1 ?
NC1 ?
SE ?
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