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17-7PH Spring Surge Fatigue
dgallup, Thanks for that screenshot - that natural frequency would be for a spring between two fixed plates - for my purposes I believe a fixed plate/sinusoidal drive would be more appropriate which would be equivalent to a spring of twice the length resonance wise. (or would half the...- Honel
- Post #15
- Forum: Spring engineering
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17-7PH Spring Surge Fatigue
Israel, Due to the fact that this component must undergo seismic qualification in its current position, the spring/mass relationship has been evaluated and is around 39Hz. However, that is the free response of the mass spring system. If the free end is driven at a certain frequency (with the...- Honel
- Post #11
- Forum: Spring engineering
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17-7PH Spring Surge Fatigue
All, Mean Spring Diameter per data sheet is 0.757in. I'm afraid I don't have more information on the material other that what the data sheet lists. From the data sheet - "Stainless steel 17-7PH Wire Spring Tempered" is all I've got. Israel, I look forward to reading through that reference (I'm...- Honel
- Post #9
- Forum: Spring engineering
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17-7PH Spring Surge Fatigue
Desert fox, Those equations (the same as those ones found in shigleys mechanical design) are the ones I used to calculate the frequency above. Also, the number you have for mean diameter sounds correct. I will confirm tomorrow though. Thanks. Israel, Surge is when the coils are collapsed on...- Honel
- Post #6
- Forum: Spring engineering
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17-7PH Spring Surge Fatigue
Ah, sorry I didn't realize I had forgotten the outside diameter. I will post it Monday when I get back to work and have the data sheet in front of me. I believe it is somewhere in the 0.750in range though. As far as the temper comment - I am not exactly a spring expert, that is what is stated in...- Honel
- Post #4
- Forum: Spring engineering
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17-7PH Spring Surge Fatigue
Hello all, I have a question for which there seems to be little guidance. I have a spring in a nozzle check valve that is failing due to what appears to be fatigue in a very short time. A few calculations showed me that the PD pump upstream was pulsing within 6Hz of the surge frequency of the...- Honel
- Thread
- Replies: 14
- Forum: Spring engineering
