A stainless steel is exposed to a temperature of 600 degree

A stainless steel is exposed to a temperature of 600 degree C. What is the maximum allowable stress level for a rupture lifetime of 1 year? 10 years? 10^3 T(20 + log t_r)(degree R - h)

Solution

It first become to calculate the value of Larsen Miller parameter for each time.the value of tr for 1 and 10 yr corresponding to 3.38 .using the curve the stress level is 240mpa and 190mpa approximately respectively.