Shown in Figure 12.1b is a torsion bar used as a counterbalance spring for the trunk lid of an...

Question

Shown in Figure 12.1b is a torsion bar used as a counterbalance spring for the trunk lid of an automobile. The length of the torsion bar portion is 42.5 in. and the diameter is 0.312 in. Calculate the change in shear stress in the bar and the change in torque when one end of the bar angularly rotates 75° relative to the other end.

David · Accepted Answer

Ans. 1 
The length of the torsion bar is, 
42.5inl   
The diameter of the rod, 
0.312ind   
The angler rotation of the bar, 
075  
Apply the torsion equation, 
r
T G
J I
 
   
Substitute the values in the equation, 
2
1.308
42.5
0.

Shown in Figure 12.1b is a torsion bar used as a counterbalance spring for the trunk lid of an automobile. The length of the torsion bar portion is 42.5 in. and the diameter is 0.312 in. Calculate the...

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