Are stiffness and modulus the same?
Stiffness: The resistance of a member to bending is defined as stiffness. Many papers' end-of-use performance is heavily influenced by stiffness.
Modulus: A coefficient that indicates how much of a given property a substance possesses. The stress-strain ratio is known as the modulus of elasticity. Young's modulus, Shear modulus, and Bulk modulus are the three forms of elastic moduli that exist.
The young's modulus equation or ,
Where, is the applied force, the initial length, the square area, and young's modulus.
Therefore, The geometric property is stiffness. The material attribute is the Youngs modulus. However, both are symbiotically related to one another. Resistance to elastic deformation is stiffness.