Machine Design
The stress which vary from a minimum value to a maximum value of the same nature (i.e. tensile or compressive) is called

Alternating stress
Repeated stress
Fluctuating stress
Yield stress

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Machine Design
When a machine member is subjected to torsion, the torsional shear stress set up in the member is

Maximum at both the centroidal axis and outer surface of the member
Zero at the centroidal axis and maximum at the outer surface of the member
Zero at both the centroidal axis and outer surface of the member
Maximum at the centroidal axis and zero at the outer surface of the member

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