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Stiffness is a qualitative measure of the elastic deformation produced in a material. Stiffness is the ability to resist a deformation within the linear range of the stress-strain curve. High stiffness means high ability to resist deformation. The modulus of elasticity is proportional to stiffness. Furthermore, the modulus of elasticity is a measure of the stiffness of a material. A stiff material, with a high modulus of elasticity, maintains its size and shape even under an elastic load. Materials with a high modulus of elasticity have a high stiffness.
Also, the modulus of elasticity E is a measure of the stiffness of a material. The modulus of rigidity is also a material stiffness property.
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This lesson is associated with Mechanics of Materials, Machine Design