58. A force 
is applied at B shown in
the figure. The cantilever AB is connected to a torsion bar OA which
is simply supported at A and is fixed at O. Bar OA has a
spring rate of 
and a length of 
. Cantilever AB has a spring
rate of 
and a length of 
. If the allowable deflection at B
is 
, determine the probability of
failure. Assume that 
, 
and 
are independent.
Answer: 
