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The strain is defined as the ratio of change in dimension to the original dimension.
If ‘δl’ changes in the length and ‘l’ is the original length, strain = δl/l
Important Terms:
Consider the following stressstrain diagram and match the following:
List  I
List  II
1. Hard rubber
2. Soft rubber
3. Structural steel
4. Aluminium alloy
Young's modulus is defined as the ratio of
The linear relationship between stress and strain for a bar in simple tension or compression can be expressed by the equation
in which Eis a constant of proportionality known as modulus of elasticity for the material. The modulus of elasticity is the slope of the stress strain diagram in the linearly elastic region and its value depends upon the particular material being used.
Match ListI (Material) with Listll (Young’s modulus):
The permanent mode of deformation of a material known as ____________
Plasticity is defined as the property of a material due to which it is permanently deformed due to loading. Elasticity is the temporary form of deformation. Twinning and Slip are mechanisms of Plastic deformation.
A thin mid steel wire is loaded by adding loads in equal increments till it breaks. The extensions noted with increasing loads will behave as under
At first, the strain is proportional to strain or elongation is proportional to the load giving a straightline relationship.
A further increase in the load after yield load will cause marked deformation in the whole volume of the metal. The maximum load which the specimen can withstand without failure is called the load at the ultimate strength.
Match List1 (Materia!) with Listll (Poisson’s Ratio)
During a tensile test on a specimen of 1 cm^{2} crosssection, maximum load observed was 80 kN and area of crosssection at neck was 0.5 cm^{2}. UTS of specimen is
= 800 MPa
The ability of a material to resist plastic deformation known as _____________
The point of stretching where it increases suddenly is known as yield strength, i.e. the region where the stretch is elastic. Tensile strength is the force needed to fracture the material. Impact strength is the capacity of a material to resist shock energy before a fracture.
Resilience of a material is considered when it is subjected to
Resilience represent the ability of the material to absorb energy within the elastic range.
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