Strength of Materials

SALIENT POINTS

• Strain energy is the energy which is stored in the body due to the effect of straining.
• Elastic strain energy is the recoverable stored energy in the elastic body.
• Resilience is the total energy stored in a body within its elastic limit.
• Proof resilience is the maximum strain energy stored in a body.
• Modulus of resilience is the greatest amount of strain energy per unit volume that a material can absorb without exceeding the elastic limit.
• Strain energy stored depends on the type of loading, viz., gradual loading, sudden loading and impact loading.
• Strain energy due to gradual loading is    

   

  where P_g = gradually applied load