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
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Altair EmployeeHello 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.
Altair EmployeeHi 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 /emoticons/default_smile.png' srcset='/emoticons/smile@2x.png 2x' title=':)' width='20'>
Fatigue Process Manager (FPM) using S-N (Stress - Life) Method
SN curve set value for steel material
SRI1 ?
B1 ?
NC1 ?
SE ?
Hi @Christian J.
Is this a continuous event?
UTS is the ultimate tensile strength of the material. Rest you can get from SN curve (if you have data). See the image below:
Please refer OptiStruct user guide.
<?xml version="1.0" encoding="UTF-8"?>