GATE Mechanical Engineering (ME) 2017 Shift 1 Solved Paper

A machine element has an ultimate strength (σ_u) of 600 N/mm², and endurance limit (σ_en) of 250 of 250 N/mm². The fatigue curve for the element on a log-log plot is shown below. If the element is to be designed for a finite life of 10000 cycles, the maximum amplitude of a completely reversed operating stress is_______N/mm².