Gun barrel stiffning

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Gun barrel stiffning

Post by DaveMargetts » Wed Aug 22, 2018 4:50 pm

I was told by my old Mech Eng techer (who used to work for the royal ordinance) that Navy gun barrels were stiffened by being sealed at both ends and then pressurised until the inner material had stretched beyond its elastic limit (plastic zone) but the outer layer had not, thus when the pressure was released, the outer layer tried to shrink onto the permanently deformed inner layer, thus creating very high stress and a very stiff barrel. (He always boasted that we Brits had a very much better 'droop factor' (oh-er misses) than the Yanks because of that treatment... Anyone else heard of this?

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Herr Nilsson
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Re: Gun barrel stiffning

Post by Herr Nilsson » Fri Aug 24, 2018 7:30 am

That's called "autofrettage".


"Thank God we blow up and sink more easily." (unknown officer from HMS Norfolk)

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