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Re: Aircraft cable[Subject Prev][Subject Next][Thread Prev][Thread Next]
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- Subject: Re: Aircraft cable
- From: nma <nma(--nospam--at)nma-se.com>
- Date: Tue, 13 Jan 2015 12:14:12 -0800
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Here's some info from this web site: <http://safetysling.thomasnet.com/item/wire-rope/7-x-19-galvanized-aircraft-cable/1096>Note that the strength is 9800 lbs - this is usually breaking strength. I don't know what you are using this for, but some codes require a factor safety of 5 of the Fu. (whoops - just found a NAVFAC document that allows a FS of 2 for unoccupied areas)
I'm also looking at ASTM A475 and notice that there are different grade os wire, i.e. Utilities grade, common grade, Siemens-Martin grade and high strength grade. Also note that you can get the wire prestretched.
<https://law.resource.org/pub/us/cfr/ibr/003/astm.a475.1978.pdf> An old discussion on eng-tips.com: <http://www.eng-tips.com/viewthread.cfm?qid=192503> Neil On 1/13/2015 10:47 AM, Thor Tandy wrote:
Hi Everyone Thanks for the responses. Yes, I found the Tiger reference but it doesn't give the (metallic) crosssection area either. I am also referencing Hanes and the "Wire Rope User's Manual".The loading on the cable I'm reviewing is light (only 225lb). For a 5/16" aircraft cable (7x19), assuming the cable steel density is about 0.28 lb/in^3 the equivalent metal area is about .05in^2 (i.e. equiv to a 1/4" dia solid). E varies with life history but for this relatively low loading and the low periodic use of the cable, I think I can assume that E for a new cable is probably OK for my deflection estimate. I have found the E is probably about 15E6lb/in^2 for a new 7x19 cable ...? Actual stretch will also be affected by any "unravelling" of the cable twist but again I think the light loading condition will avoid significant extension due to wire rotation.
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- RE: Aircraft cable
- From: Thor Tandy
- RE: Aircraft cable
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