Elastic Properties of Solid

Elastic Properties of Solid

1. Elastic Force

   • deformation of solid occur when external force is applied
   • elastic region
     • change in length is proportional to applied force
     • explained by Hooke's Law
   • elastic limit
     • maximum limit for the object to be able to returm to its original shape
   • plastic region
     • beyond elastic limit
     • deformation is permenant
     • object will not return to initial length and size when force is removed
   • breaking point
     • further application of force causes material to break

2. Elastic Modulus

   • elastic behaviour
     • stress - the quantity related to force causing the deformation
     • strain - a measure of the degree of deformation
   • elastic modulus = stress/strain
   • long thin wire
     • tensile stress =
     • tensile strain =
     • Young's Modulus, Y =
   • large object
     • deformation can be changed in volume due compression stress
     • Bulk's Modulus, B =

3. Shear Modulus

   • forces may be parallel to one of object's faces
   • stress is called shear stress
   • G = sheer stress/sheer strain

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