Stress and Strain Concepts

Front

What is the definition of stress?

Back

The force per unit area, defined as Stress, σ = Force/Area = F/A.

Front

What is the SI unit of stress?

Back

N m–2 or pascal (Pa).

Front

What is the dimension of stress?

Back

[ML1T–2].

Front

What is strain?

Back

Strain measures how much an object is stretched or deformed when a force is applied.

Front

What is the formula for strain?

Back

Strain, ε = ∆L / L.

Front

Is strain a dimensionless quantity?

Back

Yes, strain is a dimensionless quantity and has no unit.

Front

How many types of strain are there?

Back

Strain is classified into three types.

Front

what is Hooks law

Back

Hooke’s law states that for a small deformation within the elastic limit, the strain produced in a body is directly proportional to the stress that produces it.

Front

what is poissons ratio

Back

It is defined as the ratio of relative contraction (lateral strain) to relative expansion (longitudinal strain). It is denoted by the symbol µ

Front

which is more elastic?

Back

Steel is more elastic than rubber. If an equal stress is applied to both steel and rubber, the steel produces less strain. So the Young’s modulus is higher for steel than rubber. The object which has higher Young’s modulus is more elastic.