Modulus of Resilience: It refers to the capacity of a material to absorb energy in the elastic range. Its value is simply equal to the area under the elastic region of the stress-strain curve. For any linearly elastic material, the modulus of resilience is found as
U = 0.5seee or U = 0.5se2/E
where se is the elastic-limit or proportional-limit stress of the material.
