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wouldn't that be 2PI? that's just angular frequency i did find another textbook that corroborates the "no pi" equation...3rd edition of Machine Design by Norton...

Hi everyone, bit of a debate going on amongst some mechanicals at my company and I thought I'd fish for some insight online. With regards to the natural frequency of a spring (both ends fixed), I've encountered a company design guide that suggests a spring will resonate longitudinally at...

Per Ashby and Jones, the crack growth rate is described by: da/dN = A(deltaK)^m and goes on to say that A and m are material constants. Has anyone turned up A, m data on any web resources for Inconel alloys? I've seen a few journal article abstracts that make reference to them, but nothing...

That's a great resource, thanks! I'd pretty much had it sorted out by this point, but that site would have saved some grief. :)

Actually that is just the sort of key word I was looking for Greg. I think that is going to help alot from what I am seeing in the literature so far. Thanks, at least I can get started now.

Sure, no problem... From the Mathcad sheet I worked up (phys. dims in inches): d, wire dia. = .187 D, outside dia. = 1.460 Nt, total coils, squared and ground = 7.07 Fl, free length = 2.25 WH, workign height = 1.73 Combined with the G (11.2*10^6 psi), gives a spring rate of 164 lb/in. For the...

Hi all, I'm having a tough time turning up any literature pertaining to the subject line problem. Perhaps this is predominantly due to my newness to the field of vibration analysis and the concurrent lack of keyword insight for searches. Spring material: 302 SS, spring temper (AMS5688)...

I appreciate any help I could get with this problem. Basically I am trying to analyze the flow of air through 4 sharp-edged entrance orifices into an annulus then out 12 sharp-edged exit orifices. So it flows in, takes a right turn then travels about an inch then out the bottom orifice. It'd be...

yes you are right on quark the transition from laminar to turbulent is not constant at Re ~2100, but must also account for the Dean Effect and geometry (d_pipe/D_helix)...this can result in vastly higher transition Re, 10k for d/D ~ 8 or so... btw the estimate of just using a straight pipe...

Actually I see that both methods are flawed. Required a pretty freaking extensive literature search though ;[. And the resulting equations aren't the prettiest ever. I'd still like to hear some comments on the ideas though.

Please help me settle an argument in flow of turbulent water through a coil. I argue that one must account for an increase in the effective length of the coil due to the continuous bend of the pipe as it follows the helical path. In my opinion this effective length increase may be modeled as...

forgot to mention, that's for aircraft engine externals industry, generally a great deal of cast parts that are machined to finish good luck

.XXX = +/- .010 .XX = +/- .03 .X = .1 Angles = +/- 2 deg. take it for what it's worth other standards per mil-dtl-31000

Thanks for comments everyone, I believe that with the references mentioned I was able to come up with the appropriate solution. chicopee: We use commercial lifting supplies from Crosby, however the steel department at the shipyard manufactures their own padeyes for the riggers. Thanks, Mike

thank you for your suggestions in this case, a swivel hoist is not practical, but i will certainly keep this technology in mind. additionally, could you please give me the title of Peterson's book? I am unfamiliar with this work. Thank you, Mike

Greetings all, I could use some help tracking down a extensive chart showing stress concentrations for plates with a central hole for the case of an applied bending moment. Additionally, any commentary or tips on the problem of designing a padeye to sustain a force applied at an angle to the...