MECHANICS OF SOLIDS
(2 MARKS QUESTION BANK)
STRESS, STRAIN AND DEFORMATION OF SOLIDS
1.Define tensile stress and tensile strain.
The stress induced in a body, when subjected to two equal and opposite pulls,as a result of which
there is an increase in length, is known as tensile stress.
The ratio of increase in length to the original length is known as tensile strain.
2.Define compressive stress and compressive strain.
The stress induced in a body, when subjected to two equal and oppositepushes, as a result of which
there is a decrease in length, is known ascompressive stress. The ratio of increase in length to the original
length isknown as compressive strain.
3.Define shear stress and shear strain.
The stress induced in a body, when subjected to two equal and opposite forces, which are acting
tangentially across the resisting section as a result of which the body tends to shear off across the section is
known as shear stress and corresponding strain is known as shear strain.
4. Give example for ductile, brittle and malleable materials.
a. Ductile materials steel, copper
b. Brittle materials wrought iron
c. Malleable materials cast iron
5.Define Poisson‘s ratio
The ratio of lateral strain to the linear strain is a constant for a given material,whenthe material is
stressed within the elastic limit.
6. Write the relationship between modulus of elasticity, modulus of rigidity and Poisson‘s ratio
7.State Hooke‘s law.
Hooke‘s law is statedas when a material is loaded within elastic limit, the stress is proportional to the
strain produced by stress, or Stress/strain=constant. This constant is termed as modulus of elasticity.
8. Define stress and strain.
The force of resistance per unit area, offered by a body against deformation is known as stress.
The ratio of change in dimension to the original dimension when subjected to an external load is
termed as strain and is denoted by e. It has no unit.
9. Define modulus of rigidity.
The ratio of shear stress to the corresponding shear strain when the stress is within the elastic limit is
known as modulus of rigidity or shear modulus and is denoted by C or G or N.
10. Define modulus of elasticity.
The ratio of tensile stress or compressive stress to the corresponding strain is knownas modulus of
elasticity or young‘s modulus and is denoted by E.
11. Define Bulk modulus.
When a body is subjected to an uniform direct stress in all the three mutually perpendicular
directions, the ratio of the direct stress to the correspondingvolumetric strain is found to be a constant is
called as the bulk modulus of thematerial and is denoted by K.
12. Define factor of safety
It is defined as the of ultimate stress to the working stress or permissible stress.