CHAPTER-2

STRAIN

• Q1: Define Strain.
  Ans:The ratio of change in dimension to original dimension is strain. It has no unit.
• Q2: Why does strain has no unit?
  Ans:It is because both change in length and length have the same units which cancel out each other.
• Q3: Name the types of strain
  Ans:The types are:

  • ➔ Direct Strain
    • ➔ Tensile Strain
    • ➔ Compressive Strain
  • ➔ Shear Strain
  • ➔ Volumetric Strain
    • ➔ Linear Strain
    • ➔ Lateral Strain
• Q4: Define tensile strain.
  Ans:If a Tensile force is applied on the body and its length increases, this is a Tensile Strain.
• Q5: Define compressive strain.
  Ans:If a Compressive force is applied on the body and its length decreases, this is a Compressive Strain.
• Q6: What do you know about shear strain.
  Ans:The strain produced in a body due to Shear Force and Shear Stresses is called Shear Strain.
• Q7: Define volumetric strain.
  Ans:If a force is applied on the body and the volume of the body changes i.e. the length, height or width changes then such a strain is volumetric strain.
• Q8: Name various elastic constants.
  Ans:Some of the elastic constants are:

  1. Modulus of Elasticity
  2. Modulus of Rigidity
  3. Bulk Modulus of Elasticity
• Q9: Define Bulk Modulus of Elasticity.
  Ans:The ratio of direct stress to volumetric strain is Bulk Modulus.
• Q10: Define Shear Modulus.
  Ans:The ratio of shear stress to shear strain is Shear Modulus.
• Q11: State Hook's Law.
  Ans:Hook's Law states that:
  “Within elastic limits, stress is directly proportional to strain”
• Q12: Define Tension.
  Ans:Increase in length is called Tension.
• Q13: Define Compression.
  Ans:Decrease in length is called Compression.
• Q14: Define Tensile Force.
  Ans:A force that produces Tension (Increase in length) is called Tensile Force.
• Q15: Define Compressive Force.
  Ans:A force that produces Compression (Decrease in length) is called Compressive Force.