|Apr26-12, 08:58 PM||#1|
Torsion test simulation
I am simulating torsion tests (after being successful with tension and compression tests). For tension and compression, I got a good comparsion with experimental and behaviour in tension is same as in compression (of course leaving the necking part).
For torsion tests, I have taken equivalent tensile stress = shear stress*sqrt(3) and equivalent tensile strain as = shear strain / sqrt (3).
This is based on Von Mises criteria.
But I have a problem, doing this I find that there is a variation of about 6-8 % from the uniaxial tension test and compression test . IS there some approxiamtion in Von Mises criteria of equivalent tensile stress and strain?
I tried to google and more and this what I found:
From this ; am I correct below (you can read the abstractabove as well):
“Torsion equivalent stresses obtained using Von Misesrelationship (as I have done) are 6.5% lower than those obtained using BishopHill formulation which is more accurate”
So, can we say that torsion equivalent stresses will bearound 6.5% less than that obtained using uniaxial tension ?
|May1-12, 10:00 PM||#2|
Please can anyone help?
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