How to calculate 3D Principal stresses?
If I got the values of 6 stress tensors:
Then I can calculate the values for the 3 stress invariants I1, I2 and I3:
I also know the relationship between the stress invariants and principal stresses:
So how can I calculate the values for the...
I did some research then found out the transfer between FFT and IFFT is kind of accurate, so wouldn't be a problem then.
So the most difficult thing at the moment is, work out the random response analysis to identify the dynamic amplification factors for each mode and final stresses, as it...
Morning John.
Yep that what I thought, But the thing is, when we doing the trnsfermation, time->frequency->time domain process, after all of them, is the data still gona be accurate?
Did spent quite a long time to think through what you said, sounds very interesting.
Well, the conventional method for doing the fatigue analysis at the moment is still the rainflow cycle counting in time domain. From what you said, we transfer time domain to the frequency domain, then do we...
Thank you so much for your quick reply John! I do appreciate it!
I went through your answer, still something there I don't quite understand. What do you mean by "crosscheck with loads frequencies to find out if loads will potentially excite it"? And also, could you explain a bit more about...
Thx John.
I got what you said. Well, I can definitely transfer these time domain plots into a frequency domain plots by Matlab FFT. But the thing is, what should I do next to find out the fatigue load from these frequency domain plots? The most annoying thing is this is not a simple 1d or 2d...
Hi everyone.
I'm working with a project about Fatigue Analysis now. I got some questions I'm stuck with at the moment. So I'm wondering if you have any idea about them.
The method people usually use to solve the fatigue problem at the moment is like this:
The first six plots shows...