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  1. zerow3

    metal orientation

    Hi everyone I recently bought a steel bar that is 2”x2”x12”. The supplier told me that it was cut from a forged plate. I notice that the plate that my bar was cut from was forged from a circular bar. What I wanted to know is the orientation of my bar in reference to the plate. From the...
  2. zerow3

    Crack monitoring strain gauge for fatigue

    Thanks for the help Bob, I must have missed the second statement when I was reading their website :)
  3. zerow3

    Crack monitoring strain gauge for fatigue

    Hi redpicker, thanks for the reply. I was thinking something similar, but I think it will get quite complicated. Because I will be using load control and probably at high frequency to speed up the test, so it would be quite difficult to get the hydraulic machine to compensate for it...
  4. zerow3

    Crack monitoring strain gauge for fatigue

    Hi all, hope I am posting in the right place. I will be conducting some load control fatigue test on my compact tension sample. I have done these test before and successfully monitored the crack with a CMOD clip gauge. But this time I am running at low load and a paper that I found said that...
  5. zerow3

    Flight regime abbreviation ôPART PWRö

    Thanks, I have been quite busy and forget to reply :P Compositepro was right, I find out that it stand for Partial power
  6. zerow3

    Flight regime abbreviation ôPART PWRö

    Hi, I have come across this flight regime/maneuver abbreviation “PART PWR” does anyone know what it stands for?
  7. zerow3

    S-N data correlation

    Thanks
  8. zerow3

    S-N data correlation

    Many thanks. Any suggestions/reference on how to select the number of specimens needed for each curve?
  9. zerow3

    Black hawk fatigue reports

    Thanks anyways, I have now got access to those documents through my contact.
  10. zerow3

    S-N data correlation

    Hi, I am trying to do some fatigue calculations on a component, but find that there are not enough material data (S-N data). So I am trying to generate my own data (mainly with higher stress ratios) to use in conjunction with those available. However, the data available are at a different heat...
  11. zerow3

    uniaxial fatigue testing - hollow cylinder

    Thanks
  12. zerow3

    uniaxial fatigue testing - hollow cylinder

    Hi, I have been talking to someone about uniaxial (tension-tension) loading fatigue testing. They told me that hollow cylinder specimen is a lot harder to work with than solid cylinder specimen in terms of fatigue. I just want to know the reason for that. Is it because the cross section of the...
  13. zerow3

    uniaxial fatigue testing - hollow cylinder

    Hi, I have been talking to someone about uniaxial (tension-tension) loading fatigue testing. They told me that hollow cylinder specimen is a lot harder to work with than solid cylinder specimen in terms of fatigue. I just want to know the reason for that. Is it because the cross section of the...
  14. zerow3

    PH 13-8 Mo with H1050 condition

    Thanks, they seem to be useful. Do you happen to know where I can find the S-N data for the same material (with condition H1050)?
  15. zerow3

    PH 13-8 Mo with H1050 condition

    I have checked the ASMD from CINDAS; it only got data for condition H1000. Does the Damage Tolerant Design Handbook contain the same data or they are generated by different parties than the ASMD?
  16. zerow3

    PH 13-8 Mo with H1050 condition

    Thanks, I actually got that article. However, I am after something that is more general. The article is only about small-cracks and only explore R ratio of 0.1 and -1. I am trying to find the fatigue data for long cracks with a wide variety of R ratio (preferably high R ratio, such as 0.6-0.9)
  17. zerow3

    PH 13-8 Mo with H1050 condition

    Hi, I am trying to look for fatigue crack growth data (da/dN-?K data) for the material PH 13-8 Mo stainless steel with H1050 condition. I have looked through MIL-HDBK-5J, but they don’t have the crack growth data. Anybody able to provide or help me to locate the data?
  18. zerow3

    Black hawk fatigue reports

    I am trying to look for some black hawk fatigue reports produced by Sikorsky. They have report number such as Ser-70116, anyone have any idea where I can get a free pdf version of them? I am in particular looking for a part that describe the fatigue testing procedure on the main rotor tie rod.
  19. zerow3

    load spectrum and usage spectrum

    Thanks
  20. zerow3

    load spectrum and usage spectrum

    I am new to material fatigue and I have just started doing some work on helicopter fatigue. I am getting confuse about load spectrum and usage spectrum. Are they the same thing? It will be good if someone can provide me a link to an example of each.

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