A ductile material having an endurance limit of 196 N/mm2

A ductile material having an endurance limit of 196 N/mm² and the yield point at 294 N/ mm² is stressed under variable load. The maximum and minimum stresses are 147 N/ mm² and 49 N/mm². The fatigue stress concentration factor is 1.32. The available factor of safety for this loading is

Consider Soderberg equation

	τ_a	+	τ_m	=	1
	S_e		S_y		FOS

τ_a =	147 - 49	= 49 MPa
	2

τ_m =	147 + 49	= 98 MPa
	2

S_e =	196	= 147.48 MPa
	1.32

	49	+	98	=	1
	147.48		294		FOS

FOS = 1.5