The yield strength of a steel shaft is twice its endurance

Home » Machine Design » Machine Design Miscellaneous » Question

The yield strength of a steel shaft is twice its endurance limit. Which of the following torque fluctuations represent the most critical situation according to Soderberg criterion?

1. – T to + T
2. –T/2 to + T
3. 0 to + T
4. + T/2 to + T

Correct Option: A

τ_a	+	τ_m	=	1
S_e	+	S_y	=	Fos

τ_a	+	τ_m	=	S_e
1	+	2	=	Fos

τa is highest in (a)