#1




hope this is of use to someone
To calculate the shear strength of a pin take cross sectional area x3.142(pi) x shear strength of material = shear strength of pin. eg. my pins are 19.5 mm dia. I always calculate in inches so 19.5 /25.4 = 0.767" dia so rad is 0.3835 0.3835 x 0.3835 x 3.142 x 35 ( I used 35 ton steel) = 16.17 tons. my pins are in double shear so to shear each side takes 32.34 tons and both sides together 64 tons. As I'm using a 20 ton jack the pins are well able to handle the tonnage. Now on to weld strength. If you use a 60XX rod the 60 denotes 60,000 lbs tensile, a 70XX rod or wire 70,000lbs and so on. If you have done a fillet weld and want to know the strength it is leg lengthx0.707(sin45) x weld length inches x tensile strength weldment. Using a 1/4 inch fillet as an example and 5 inches long using 60XX rods = 0.250 x 0.707 x 5 x 60,000 = 53,025 lbs shear strength thru the length. divide this by 2240 (pounds per English ton) and you get 23 tons shear. Welds are deceptively strong. If anyone wants to rewrite this to make it clearer please do. Clive
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It's So Easy Last edited by clive; 02092013 at 04:18 AM. Reason: grammer 
#2




I think you might need to throw in a factor of .75 there since the shear strength is about 75% of the tensile strength.
(So shear strength of your pins is probably about 12 tons.) See table at: http://www.engineersedge.com/manufac...s_strength.htm 
#3




Yep, but still a good degree of safety at 12 tons. Thanks for pointing that out.
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It's So Easy 
#4




Quote:
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#5




Thank you for posting. That info helped clear some things up in my mind. It is always nice to learn something everytime I come to this forum from the great people posting. This is what makes this the best forum!
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Brian You don't know what you don't know. "It's what you learn after you know it all that counts." John Wooden 
#6




Kudos
Well, we like to think so!
DrBob So THAT'S what a "long ton" is! 
#7




Cool  thanks for posting that! Learn something new every day! Long Ton, Short Ton, now I just need to figure out what a $h!t Ton is...
Last edited by willy; 02092013 at 05:36 PM. 
#8




Lets add to that  the metric ton is 2200lbs. But metric, long or short they are all in a ballpark figure.
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It's So Easy 
#9




Anyone looking for a good units converter, try this one. http://joshmadison.com/convertforwindows/
Sent from my iPad using SFT 
#10




That would be a crap load more than either the long, short or metric tons
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