Tek-Tips is the largest IT community on the Internet today!
Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!
-
Congratulations TugboatEng on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!
Search results for query: *
- Users: BenGib
- Order by date
-
Vibration Fatigue
izax1, Im not sure I agree with you...I think what Steinberg says is that for one resonance peak you can assume the positive crossings per sec is simply the resonance frequency, but I dont think there is anything in the post-process of problem 8.20 which is limited to single resonance. The...- BenGib
- Post #15
- Forum: Mechanical Acoustics/Vibration engineering
-
Vibration Fatigue
Hi dylan1450, If I am not mistaken the Steinberg reference assumes a gaussian distribution and hence the different probabality from each environment is taken into account as follows: The sigma 1 RMS stress ocurrs 68.3% of the time, thus the total number of cycles is equal to .683 X (total time...- BenGib
- Post #12
- Forum: Mechanical Acoustics/Vibration engineering
-
Vibration Fatigue
I still dont get it...if I calculate the RMS stress from an output PSD (obtained from the transfer function and the input PSD of a random vibration test), why cant I just go to standard S-N data for R=-1 and apply miners rule for sigma 1, 2, and 3 with the cycles calculated from the positive...- BenGib
- Post #10
- Forum: Mechanical Acoustics/Vibration engineering
-
Butt splice or Overlap
If your dealing with relatively thick laminates you might want to consider a step or scarf joint, as far as I know its the best way at reducing stress concentrations and preventing delamination at run-out plies. I cant think of any reason at all why an overlapped joint would be advantageous...- BenGib
- Post #2
- Forum: Composite engineering
