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Hooke's Law. When an elastic object - such as a spring - is stretched, the increased length is called its extension. The extension of an elastic object is directly proportional to the force applied to it: F = k Ã e. F is the force in newtons, N. k is the 'spring constant' in newtons per metre, N/m. e is the extension in metres, m.
So, stress = k * strain [here, k is a constant] or, stress/strain= k Now, if the stress and strain occurs â¦ due to axial force then k is known as modulus of elasticity and it is denoted by E. if the stress and strain occurs due to shear force then k is known as modulus of rigidity and it is denoted by G.he modulus of rigidity, G, is, for isotropic materials, related to E as. G = E/ (2(1+u)) where u = poisson ratio which varies from 0 to 0.5 and is usually 0.25-0.33 for many metals. tensile stress = Ee e = tensile strain. shear stress = Gk k = shear strain.