Machine Design
A closely coiled helical spring is acted upon by an axial force. The maximum shear stress developed in the spring is τ. The half of the length of the spring if cut off and the remaining spring is acted upon by the same axial force. The maximum shear stress in the spring in new condition will be

2 τ
τ/2
τ
4 τ

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Machine Design
Plastic flow in ductile materials

Increases the seriousness of static loading stress concentration
Depends on other considerations
Has no effect on it
Lessens the seriousness of static loading stress concentration

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Machine Design
Which is correct statement? Stress concentration in cyclic loading is

Equally serious in both types of materials
Seriousness would depend on other factors
Very serious in brittle materials and less serious in ductile materials
Very serious in ductile materials and less serious in brittle materials

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