The ratio of maximum stress in a machine component (at a notch or fillet) to the nominal stress at the same section is called
Select the WRONG statement:
The effect of stress concentration is more severe in case of brittle materials, due to their inability of plastic deformation. Brittle materials do not yield locally and there is no readjustment of stresses at the discontinuities.
Consider the following figure and match the following:
1. Gerber line
2. Soderberg line
3. Failure line
4. Fatigue line
5. Goodman line
6. Yield line
The selection of the factor of safety in design is not dependent upon:
Failure of a material is called fatigue when it fails
Fatigue failure is characterised below the yield point.
The fatigue life of a part can be improved by
Shot peening is the process of producing residua! compressive stress within the material which leads to increase in fatigue life of the component.
The severity of stress-concentration can be reduced
In practice, reduction of stress concentration is achieved by following methods.
1. By providing additional notches and holes intension member
2. By drilling additional holes for shaft
3. By providing a small undercut in threaded member
If the size of a standard specification for fatigue testing machine is increased the endurance limit for the material! will
In the diameter or size of the components is more the surface area will have greater number of surface defect. Hence endurance strength of component reduced with increase in size.
Stress concentration factor is ratio of
Fatigue stress concentration factor can be defined as the ratio of endurance limit without stress concentration to the endurance limit with stress concetration.
Resistance to fatigue of a material is measured by
Endurance iimit is term defining the fatigue resistance of material.