Strength of Material (Part-4) (General Engineering) (SSC JE)

The coefficient of restitution (COR) is the ratio of the after impact to the before impact relative velocity between two objects after they collide.
(i) For perfectly elastic collision (e) = 1
(ii) For perfectly inelastic collision (e) = 0
(iii) For other collision 0 < e < 1

When a body loaded under plane stress conditions, the number of independent stress components is 3, where is two normal components and one shear component which is σx, σy and σxy.

• But in case of three dimensional number of components in stress tensor at a point is 9 each component represents the stress acting on a particular plane.

Given,
Diameter of shaft, d = 60 mm
Radius of shaft, r = 30 mm
Shear strain (φ) = 0.006

σₘₐₓ = bending stress which depending upon y.
Then, maximum bending stress in symmetrical Isection at top and bottom but that nature are different (compression or tension).

In circular shaft bending stress due to bending moment.

Simply supported beam of span L carries a moment force at its mid span.

• A bar held between two rigid supports will be subjected to tensile stress if it is cooled.
• A bar held between two rigid supports will be subjected to compressive stress if it is heated.