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Problem: Find the Shear Stress. How do you find the y bar value of the hollow shaft? How did they arrive at that formula?
D - 30mm
d - 20mm
A? - area of the cross-section isolated by the horizontal cut; i.e., above the location of the shear stress being determined (i.e., above y)
y? - vertical distance between the centroidal axis and the CG of A?
Since: - dMxz/dx = Fxy
∴ (Dfyx/dx = Fxy/Iz )A? y
This term is known as the 'shear force per unit length' or 'shear flow'
To calculate the maximum shear stress:
Shear force,
Fxy = 30 * 9.81N = 294.9N
Shear stress,
Τ = FxyA?y? /lb
We have: I = π/64 (6.5 * 10-7) m4 = 3.19 * 104mm4
b = 10 mm
A? = ½ (πD2 - πd2/4)
= π/8 (D2 - d2)
= π/8 (302 - 202) = 196.3mm2
y? = D + d/2π = 30 + 20/ 2π
= 7.96mm
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