Shear Stiffness of a rod
Shear Stiffness of a rod
(OP)
Hi everyone,
I know this is a very basic question, but I'm having trouble finding it online. I know the axial stiffness of a circular solid member such as a rod is AE/L but what is the formula for the shear stiffness of a rod? Is it GA/L (where G is shear modulus)?
Thanks alot!
I know this is a very basic question, but I'm having trouble finding it online. I know the axial stiffness of a circular solid member such as a rod is AE/L but what is the formula for the shear stiffness of a rod? Is it GA/L (where G is shear modulus)?
Thanks alot!





RE: Shear Stiffness of a rod
RE: Shear Stiffness of a rod
RE: Shear Stiffness of a rod
RE: Shear Stiffness of a rod
you might work back from axial stiffness ... stress = P/A, strain = P/(AE), deflection = (PL)/(AE), so stiffness = (AE)/L (P = kx).
your problem is the deflection of a beam is less straight-forward to calc.
RE: Shear Stiffness of a rod
RE: Shear Stiffness of a rod
RE: Shear Stiffness of a rod
it would have helped if you'd posted this originally, cause the words are the same but the meaning is different ... i was about to write he's talking about the deflection due to shear of a beam, i think trying to point out that the shear deflections dominate for short beams and "normally" we consider only deflection due to bending.
but i'd caution you in applying this (not sure where you're going with this) ... you can't separate the two deflections in the real world. for "typical" beam applications i think we can reaonably ignore the deflections due to shear, 'cause they are much smaller than bending deflections. however, short beams require special attention.