Chapter 9 Mechanical Properties Of Solids
ELASTICITY Elasticity is a property by the virtue of which the solid regains its original shape once the external force is removed. PLASTICITY Plasticity is the property by virtue of which the sold does not regain its original shape even after all the external forces are removed. DUCTILITY Ductility is the property of a solid to be drawn into thin wires. MALLEABILITY Malleability is the property of a solid to be beaten into thin sheets.
STRESS Stress is the restoring force per unit area. When we apply an external force on the body to change its shape there is a restoring force that develops in the body in the opposite direction. Mathematically, Stress = F / A, where F is the restoring force that develops in the body and A is the area. The SI unit of stress is N/m^{2} or Pascal (Pa). Types of stress:
STRAIN Strain is a measure of deformation i.e. the displacement between the particles in the body. Mathematically, Strain= (Change in length)/ (original length) Types of strain:
HOOKE’S LAW This law states that within the elastic limit, stress developed is directly proportional to the strain produced in a body. Mathematically, Stress = k x strain, where k is the modulus of elasticity
Elastic modulus: It is the ratio of stress and strain.
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