Correct Answer - Option 1 : Modulus of fluidity
Explanation:
The various elastic constants that are the measure of different strength properties of materials are given below:
Young's modulus ( Modulus of Elasticity)
- The mechanical property of a material to withstand the compression or the elongation with respect to its length of linear elastic solids like rods, wires etc is called Young's modulus.
- It is also referred to as the Elastic Modulus or Tensile Modulus
- It gives us information about the tensile elasticity of a material (ability to deform along an axis).
\(\rm E =\frac {Normal ~stress}{Normal ~strain}= \frac {\sigma}{\epsilon}\)
where E is Young’s modulus in Pa, σ is the uniaxial stress in Pa,ε is the Normal strain or proportional deformation.
Modulus of rigidity:
- It is also known as shear modulus.
- It is the mechanical property of a material due to which it withstand shear stress and resist torsion.
- It is the ratio of shear stress to the corresponding shear strain within the elastic limit. This is denoted by G .
\(\rm \therefore {G} = \frac{{Shear\;stress}}{{Shear\;strain}} = \frac{\tau }{\phi }\)
Bulk modulus:
- It is the mechanical property of a material due to which it resists the change in volume due to external pressure or equal stress in all directions.
- The concept of bulk modulus can be used in the case of hydrostatic loading.
- It is defined as the ratio of normal stress to the volumetric strain and denoted by 'K'
\(\rm K = \frac {Normal ~stress}{Volumetric ~strain}= \frac {\sigma }{\epsilon _v}\)
Modulus of fluidity is not an elastic constant which is the measure of the strength of properties of materials.
