What failure percentage would be expected in service

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Reference no: EM131376828

Assume that the failure rate calculated in Problem 6.39 is unacceptable.

(a) To what value would the standard deviation of part strength have to be reduced in order to give a failure rate of only 1%, with no other changes?

(b) To what value would the nominal part strength have to be increased in order to give a failure rate of only 1%, with no other changes?

Problem 6.39

A particular machine part is subjected in service to a maximum load of 10 kN. With the thought of providing a safety factor of 1.5, it is designed to withstand a load of 15 kN. If the maximum load encountered in various applications is normally distributed with a standard deviation of 2 kN, and if part strength is normally distributed with a standard deviation of 1.5 kN, what failure percentage would be expected in service?

Reference no: EM131376828

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