Stress on a chain link
Stress on a chain link
(OP)
Hi,
This is my first post here. I have read a lot of the threads and learned so much. I have problem calculating shear stress on a chain link i hope someone can help me.
The chain link is consisting with 5 links that is 10mm in diameter. I found the normal stress and compared it with my FEM results and it is fine. But shear stress giving me problems. I calculated using tau=F/A, but my shear stress is too large compared to the one i get from my FEM analysis. I cannot understand why. Eventhough I know the shear stress distribute through the whole chain.
Can anyone explain me a way to find the proper shear stress?
Thank you in advance.
This is my first post here. I have read a lot of the threads and learned so much. I have problem calculating shear stress on a chain link i hope someone can help me.
The chain link is consisting with 5 links that is 10mm in diameter. I found the normal stress and compared it with my FEM results and it is fine. But shear stress giving me problems. I calculated using tau=F/A, but my shear stress is too large compared to the one i get from my FEM analysis. I cannot understand why. Eventhough I know the shear stress distribute through the whole chain.
Can anyone explain me a way to find the proper shear stress?
Thank you in advance.





RE: Stress on a chain link
RE: Stress on a chain link
Also: the geometry is unclear. You have only 5 links, but what shape are each of the five links?
What dimension is the 10 mm? What is the diameter of the cross-section of each link?
At that small a chain, why don't you just test it, rather than run a approximation as a FEA problem?
If your links are circular, they will not fail in shear but in "ovaling" as they straighten out into a series of tiny ovals.
What size are your FEA blocks inside each link- if you do insist on using FEA?
How are your links fastened back to themselves in each link?
RE: Stress on a chain link
RE: Stress on a chain link
Take a look at some good Theory of Elasticity and Advanced Strength of Materials texts, that problem has been tackled, with some rigor, before. It is a curved beam, a ring shape in bending or a chain link. Why do you think shear stress is the controlling stress in the chain link? For the most part, the shear stress should be related to the bending normal stresses, as in other bending problems. As Btrueblood mentioned, you will have the Hertz contact /bearing stresses issues to deal with and several locations of localized yielding and redistribution of stresses, at the max. chain load.
RE: Stress on a chain link
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: Stress on a chain link
racookpe1978 : The 5 links are oval shaped. I have attached the sketch below. The FEM analysis working fine. I used 1mm elements with tie contacts. But the hand calculations are confusing comparing to the FEM results. Normal stress is correct in FEM and in hand calculations. Only the shear isn't working.
btrueblood : Im using abaqus to model it. I need the hand calc to match my result in FEM. I checked the Roarke's but couldnt find anything much related to this.
dhengr : If you look at my attached imagine you will see the danger is in the shear area. Im trying to solve it using hertzian, cylinder to cylinder in grove.
KENAT : I will try using lugs too.
RE: Stress on a chain link
RE: Stress on a chain link
RE: Stress on a chain link
RE: Stress on a chain link
And what about bending stresses,as pointed out by someone else above?
Difficult (impossible?) to believe that this chain can sustain 126000 N, also considering the safety factor required by codes.
prex
http://www.xcalcs.com : Online engineering calculations
http://www.megamag.it : Magnetic brakes and launchers for fun rides
http://www.levitans.com : Air bearing pads
RE: Stress on a chain link
I have found the bending stresses, but I still don't get the matching answer I need.
The 12600N is the ultimate load. So when using the chain it is not suitable to use that load. But it is important to check just for the analysis.
RE: Stress on a chain link
RE: Stress on a chain link
prex
http://www.xcalcs.com : Online engineering calculations
http://www.megamag.it : Magnetic brakes and launchers for fun rides
http://www.levitans.com : Air bearing pads
RE: Stress on a chain link