3-8. A
rod has a diameter of 40 mm, and it is subjected to two torques, 
and 
. The
allowable torsional stress of this rod is 
. Determine
the probability of failure of this rod. Assume that 
, 
and 
are
independent.
(Ans. 
)
3-8. A
rod has a diameter of 40 mm, and it is subjected to two torques, and . The
allowable torsional stress of this rod is . Determine
the probability of failure of this rod. Assume that , and are
independent.
(Ans. )