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01-10-2021, 09:56 AM | #23 | ||||||
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Ok great thanks I just need numbers to refer to.
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01-10-2021, 10:02 AM | #24 | |||||||
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Quote:
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01-10-2021, 10:03 AM | #25 | ||||||
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Michael: this is important
Tensile strength is only a part of the equation for estimating bursting pressure. If the barrel is made of Twist with a 50,000 psi tensile strength, that does NOT mean that it will withstand a 10,000 psi load by a factor of 5. Barlow's formula P=2 S t / D P=Bursting pressure in psi. S=Tensile strength of material in tube wall. t=Wall thickness in inches. D=Outside diameter in inches. Barlow’s refers to a pipe capped at both ends with a static pressure (a pressure cylinder) so does not work well for unobstructed shotgun barrels; which are not designed to be pressure vessels as one end is open and the pressure rises and falls quickly. The Hoop Stress Formula doesn't reliably predict shotgun barrel failure either Shotgun barrels are "thin wall cylinders" σ = pr/t p= pressure; r is the inside radius; t is the wall thickness BTW: Wallace H. Coxe, in "Smokeless Shotgun Powders: Their Development, Composition and Ballistic Characteristics" published by E.I. du Pont de Nemours & Co. in 1931 cites a study in which a fluid steel barrel was cut to 9” and capped, then a series of progressively increasing pressure loads fired. The barrel cap was blown off and barrel burst at only 5,600 psi.
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01-10-2021, 10:43 AM | #26 | ||||||
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There’s no argument here all I need to know is what test did Parker’s bro’s do on there barrels
So no ones right or wrong I’m asking for data that Parker bro’s held. |
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01-10-2021, 11:12 AM | #27 | ||||||
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Cameron, if I remember correctly, Sherman Bell used modern proof loads to test those guns, and there were a lot of guns. I remember he had some movement between the hook and hinge pins but no barrels let go. Some of those guns surprised him that they held up as well as they did. Great series of articles.
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01-10-2021, 01:20 PM | #28 | ||||||
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The Double Gun & Single Shot Journal "Finding Out For Myself" series by Sherman Bell with technical assistance from Tom Armbrust
Vol 10, Issue 2, Summer 1999, Part 1, p. 9 Vol 10, Issue 4, Winter 1999, p. 21 - Destructive testing of Parker GH Damascus Vol 16, Issue 2, Summer 2005 - Destructive testing of Parker VH Vulcan Steel Vol 17, Issue 3, Autumn 2006, p. 12 - Destructive testing 8 Damascus doubles Vol 17, Issue 4, Winter 2006, p. 28 - Destructive testing 7 Damascus Vol 18, Issue 1, Spring 2007 - Destructive testing on a Damascus barrel with thinned walls; calculated by O.D. - I.D. and not measured. Destructive testing using various obstructions, including a 20g shell. Destructive testing using a shell loaded with 3 1/4 Drams by volume or 56 grains of Unique (similar to “Infallible”) with 1 1/4 oz. shot. The chamber burst with the first shot. The 3 1/4 Dram Equivalent load is 24 grains of “Infallible”. Vol 19, Issue 2, Summer 2008, p. 18 - Destructive testing 1 Damascus, 6 Twist Vol 20, Issue 3, Autumn 2009, p. 108 - Destructive testing 1 Damascus, 5 Twist “Bottom-Of-The-Barrel Wall-Hangers” The Remington Proof Loads used by Sherman Bell and Tom Armbrust were measured to be 18,560 psi. Total 28 vintage doubles/54 Twist and Damascus barrels + 2 Vulcan (Fluid) Steel
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01-10-2021, 09:53 PM | #29 | ||||||
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That is a great resource right there...Thanks for posting that Drew! What a valuable list.
I have been wanting to get some of those articles and back issues and didn't quite know where to start. Thanks again! |
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01-12-2021, 11:06 AM | #30 | ||||||
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I have read each article. The work they completed, with precision and attention to detail, was excellent. If only I had this information in my early days when I either passed on or sold a few really nice Parkers and other Damascus barreled guns on the old gunsmiths advice "wall hanger, shoot it and you'll lose your fingers". I remember, long ago, a particularly stunning Parker D that I could have purchased except for a gunsmith's opinion that he could detect a 'stretching' in the Damascus at the breech end so I passed. Sigh.
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