A mechanical component may fail as a result of which of the following
A mechanical component may fail i.e. it may be unable to perform its function satisfactorily, as a result of any one of the following three modes of failure:
1. Failure by elastic deflection
2. Failure by Yielding
3. Failure by fracture
Type of load affects factor of safety.
Explanation: Dynamic load has higher factor of safety as compared to static loading.
For cast iron components, which of the following strength are considered to be the failure criterion?
Explanation: Ultimate tensile strength is the highest stress a component can undergo before failingand hence is used as a criterion.
For components made of ductile materials like steel, subjected to static loading which of the following strength is used as a failure of criterion?
Explanation: In elastic material there is considerable plastic deformation at yielding point.
Pitting occurs on _____ of the component.
Explanation: Pitting is a process in which small holes occur on a surface of component.
Buckling is elastic instability which leads to sudden large lateral deflection.
Explanation: Definition of buckling.
The critical buckling load depends upon which of the following parameters?
Explanation: It depends on moment of inertia(which further depends on radius of gyration), elasticity and yield strength.
If there are residual stresses in the material, than lower factor of safety is used.
Explanation: Residual stress increases the chance of failure.
Which of the following relationship is true? (p=Poisson’s ratio)
According to principal stress theory, which option represents the correct relation between yield strength in shear (YSS) and the yield strength in tension (YST)?
Explanation: Shear diagonal is at 45’ and by equation of shear stress theory, the required relation is obtained.