Shear Vane Tests
Shear Vane Tests
(OP)
It is noticed that the ASTM has formulas for:
A - the rectangular shape of (1) general and (2) H=2D
B - the tampered shape of ONLY H=2D
Unfortunately our vane is tampered with d=1 inch, D=2 inches, H=5 inches. Is there a formula for this Vane?
A - the rectangular shape of (1) general and (2) H=2D
B - the tampered shape of ONLY H=2D
Unfortunately our vane is tampered with d=1 inch, D=2 inches, H=5 inches. Is there a formula for this Vane?





RE: Shear Vane Tests
If not, it's not real hard to derive if you assume constant shear resistance Su over the whole failure surface. Integrate d(torque) = Su*radius*d(area). The cylinder part is just (pi D h)*D/2*Su because radius is constant = D/2. The rest, where the radius varies from zero to D/2, I can't do in my head.
On the other hand, assuming constant Su over the whole failure surface is probably not exactly right for peak strength (although I think it is correct for remolded). Nilcon might have a calibration factor that is a little different from what you get by that simplifying assumption.
RE: Shear Vane Tests