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Re: Bronze (One-legged Support) Horse Structure[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: <seaint(--nospam--at)seaint.org>
- Subject: Re: Bronze (One-legged Support) Horse Structure
- From: "Paul Feather" <pfeather(--nospam--at)san.rr.com>
- Date: Tue, 17 Nov 1998 22:22:44 -0800
I don't think that a higher strength material will necessarily solve all your problems. I did some research on various steel alloys for a land speed record vehicle tubular frame, where lighter is definitely better. The higher strength materials provide a higher yield point, but contribute little to the stiffness of the structure. There is no substitute for basic section properties. None of the steel materials I could find would allow a reduction in tube diameter, and therefore shell size and air drag, without far greater negative performance and stability effects. Have you looked at the deflection of the sculpture? Assuming a fixed length between center point of attachment and point of fixity, and a constant moment, the deflection is dependent on only E and I. My experience is that stainless tends to have a slightly lower E than typical structural steels, and the drop from 2" dia. to 1.25" dia. reduces the I value by approx. 85%. Another issue to consider is the torsional effects of a good cross wind. The same 85% reduction in rigidity applies. IMHO, if the larger bar fits, you're better off. Paul Feather, P.E.
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