need help to determine twisting of angle with an applied force
need help to determine twisting of angle with an applied force
(OP)
I am looking for help to determine how much an aluminum angle will twist. The aluminum angle is 6061-t6 material 1/2" wall x 4" legs x 35" long. 1" from the bottom, one leg of the angle is secured to an inmovable object. 1" from the top of the other leg 30 pounds of force is applied at a 8" radius.
The question is how much will the angle twist
The question is how much will the angle twist






RE: need help to determine twisting of angle with an applied force
Go back to your text book, calculate the modulus. You've got all the other values.
RE: need help to determine twisting of angle with an applied force
That doesn't help at all! It's 1/2 inch angle 6061-t6 aluminum (not iron) leg thickness on a 4x4 angle. Ad the point is that I can't find a standard formula for torsion for an angle section.
RE: need help to determine twisting of angle with an applied force
Then theta=L*M/G/J
This is first year undergraduate stuff from your structures lectures, if that helps you to find it in your textbook.
Cheers
Greg Locock
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RE: need help to determine twisting of angle with an applied force
theta = 3TL/(Gbt^3) ... b is the length of the flanges (8" in your case).
RE: need help to determine twisting of angle with an applied force
I had already approximated the answer using theta=L*M/G/J but that is really an expression for round solids.
I am under the impression that theta = 3TL/(Gbt^3) is for thin section materials but I'll try it and see if the resule is reasonable.
RE: need help to determine twisting of angle with an applied force
RE: need help to determine twisting of angle with an applied force
in future, if you know the basics i think it helps limit the -ve comments if you say so. maybe "should i use 3TL/... here ?" rather than "what should i do ?". the former implies some knowledge, the latter implies none.
RE: need help to determine twisting of angle with an applied force