A spring manufacturer produces extension springs with a wire diameter of 0.035 in, an outer diameter of 0.248 in, a hook radius of r1 = 0.106 in and r2 = 0.089 in, and an initial tension of 1.19 lbf. The number of turns in the body is 12.17. Determine the physical parameters of the spring, verify the preload stress conditions, and find the safety factors under a static load of 5.25 lbf.
Determine the physical parameters of the spring.
Verify the preload stress conditions.
Find the safety factors under a static load of 5.25 lbf.
The spring has a spring constant of 17.91 lbf/in.
The initial stress without correction is 15.1 kpsi.
The maximum shear stress under the service load is 119.1 kpsi.
The maximum deflection under the service load is 0.227 in.
The spring meets the preload stress conditions.
The safety factor under a static load of 5.25 lbf is 2.3.
a) I, II, III, IV, V, and VI are correct.
b) I, II, III, IV, and V are correct.
c) II, III, IV, V, and VI are correct.
d) I, III, IV, V, and VI are correct.