A bar is subjected to fluctuating tensile load from 20 kN

A bar is subjected to fluctuating tensile load from 20 kN to 100 kN. The material has yield strength of 240 MPa and endurance limit in reversed bending is 160 MPa. According to the Soderberg principle, the area of cross-section in mm² of the bar for a factor of safety of 2 is

Soderberg criteria is:

	σ_a	+	σ_m
	σ_e		σ_y+

=	1	and σ_a =	100 - 20
	n		2A

⇒	40	+	60
	160		240

=	1	× A × 10³ σ_m =	100 + 20
	2		2A

A = 1000 mm²