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Arlon Online Engineering Library - TechRef! Mechanics of Materials Uniaxial Stress-Strain The slope of the linear portion of the curve equals the modulus of elasticity. Engineering Strain       = L / L0, where = engineering strain (units per unit) L = change in length (units) of member L0 = original length (units) of member pl = plastic deformation (permanent) el = elastic deformation (recoverable) Equilibrium requirements: F = 0; M = 0 Determine geometric compatibility with the restraints. Use a linear force-deformation relationship:      F = k Definitions Shear Stress-Strain       = /G, where = shear strain = shear stress G = shear modulus      , where E = modulus of elasticity = Poisson's ratio = -(lateral strain)/(longitudinal strain) Uniaxial Loading and Deformation       = P/A, where = stress on the cross section P = loading A = cross-sectional area       = /L, where = longitudinal deformation L = length of the member

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