20 mm diameter rivets are used to connect 10 mm thick piates. The perm...
Given:
Diameter of rivets (d) = 20 mm
Thickness of plates (t) = 10 mm
Permissible shear stress (τ) = 80 MPa
Permissible bearing stress (σ) = 250 MPa
Single Shear:
The force required to shear a single rivet is given by the formula:
P = τ * A
where A = π/4 * d^2
Substituting the given values, we get:
A = 314.16 mm^2
P = 80 * 314.16 = 25,133.28 N
Double Shear:
In double shear, the force is shared by two sections of the rivet. Hence, the force required to shear a rivet in double shear is twice that of a single shear.
P = 2 * τ * A
Substituting the given values, we get:
A = 314.16 mm^2
P = 2 * 80 * 314.16 = 50,266.56 N
Bearing Stress:
The bearing stress on the rivet is given by the formula:
σ = P / (t * d)
Substituting the given values for single and double shear, we get:
For single shear, σ = 25,133.28 / (10 * 20) = 125.67 MPa
For double shear, σ = 50,266.56 / (10 * 20) = 251.34 MPa
Difference in Rivet Value:
The difference in the rivet value between single and double shear is given by:
ΔP = P (double shear) - P (single shear)
Substituting the values, we get:
ΔP = 50,266.56 - 25,133.28 = 25,133.28 N
Hence, the difference in the rivet value in single and double shear is 24.7 kN (approx). Option B is the correct answer.
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