A mechanical component is subjected to a mean stress of 100 N/mm² and a standard deviation of 10 N/mm². The material of the component has a mean strength of 130 N/mm² and a standard deviation of 15 N/mm².
(i) Find the probability of failure for the component.
(ii) If better manufacturing control reduces the
standard deviation of material strength to 10 N/mm², find the probability of failure.
(iii) If we consider only mean values of the data in design, fi nd out the factor of safety.