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magichand84 (Aerospace)
19 Feb 08 1:08
Hi,
i m a newcomer here. i m currently dealing with lug stress analysis.
could anyone tel me about some essential things about lug stress analysis, formulae, etc...?
any online resources also welcome.
thank you very much.
40818 (Aerospace)
19 Feb 08 3:02
Lugs are very common place analysis. The whole branch of theory was basically solevd by Cozzone, Melcon and Hoblit where they tested hundereds of lugs to determine a suitable theory, (paid for by lockheed i believe).
Some places you will find aid are:
ESDU 06021 - Strength of lugs under transverse load
ESDU 91008 - Strength of lugs
Product Engineering, June 1953 (Development in the analysis of lugs and shear pins-Cozzone,Melcon,Hoblit)
Mike Niu's books
Bruhn (Chapter D1) 字串8
Pretty much all the major aero companies (Boeing, Lockheed, Grumman, British Aerospace/Airbust etc etc
I take it you have just enterred the wonderfull world of stressing? If so, then your company will probably have some of the data you require on-site, if not, then ask around for it. Take care though, as when the work was carried out for lockheed (SM1) there are certain criteria that must be met to ensure the lug is within the bounds of the tests data theory. Criteria is given in the stress memo, but does not normally appear in other data (which is basically nicked from lockheed)
KENAT (Mechanical)
19 Feb 08 12:35
To back up 40818, one of my first tasks in industry was designing a folding lug for a practice store, and doing some initial analysis on it.
I spoke to our chief (read only) stress engineer and he pulled out some data sheets that dealt specifically with lugs and explained to me the 3 failure cases I needed to examine for my situation etc. 字串2
So, find someone experienced to ask in the office. Chances are some gray haired old stress engineer will have all the answers you need. Just remember to be respectful and appreciative.
To get more specific answers on this site you may also need to better outline your load case/application.
For instance, in my case I just had to worry about straight pull out initially. Once bending etc gets involved it will get a bit more complex.
KENAT, probably the least qualified checker you'll ever meet...
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