Fishplates

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Maybe its just me and im not holding my tongue right when im thinking but why are all the fish plates i see rounded/angled off on the ends instead of being a square with 90 degree angles?
Reply:http://en.wikipedia.org/wiki/Fishplate-MikeThurston WeldingHuntington, IN
Reply:With out resorting to the wikiknowitall place its all about energy and directing it away from a hard spot. lolA round shape is structurally sound, think roman arch in the aqueducts. The load is directed nicely back to earth.
Reply:Not only that, but a square corner is more prone to cracking than a rounded one.  Stress and corners don't mix!  Last edited by mb_welder; 05-11-2011 at 10:24 PM.
Reply:works for me!  Thanks
Reply:Just stands to reason that a fish plate has to look like a fish else wise it would be called a dog plate or cow plate or sumthin like that.  Attached Images"The things that will destroy America are prosperity at any price, peace at any price, safety first instead of duty first, the love of soft living and the get rich quick theory of life." -Theodore Roosevelt
Reply:same reason windows on a plane have rounded corners, points = cracks
Reply:Originally Posted by SandyJust stands to reason that a fish plate has to look like a fish else wise it would be called a dog plate or cow plate or sumthin like that.
Reply:jwolf  -  You have asked a question that will have many answers, all of them adding up to a full understanding.  In short, fish-plates are an effort to relieve transverse cracking as a result of service-life.  The most eloquent refinement arose in the mid-80's, first seen on giant Hitachi crawler-hoes, OEM.  Beyond the proper taper, the weld beads extended well pasted the fish-tail into open surface  -  2" plus  -  and were gently curved away from each other.  This is a refining effort to minimize stress-risers.    Opus