Hooke’s Laws for Axial and Shear Stress KML 9/4/09 Hooke’s Law for axial (normal) stress is: ε ⋅ = σ E , where this equation hold for the linear, elastic range of deformation, and:- σ is the normal stress (with units of psi, ksi, kPa, MPa, etc.)- E is the modulus of elasticity (with units of ksi, MPa, etc.)- ε is the normal strain (with no units) A square that is drawn on an unloaded object will become a rectangle when the object is loaded under a normal stress. Unloaded Loaded in tension Loaded in compression Hooke’s Law for shear stress is: γ ⋅ = τ G , where this equation hold for the linear, elastic range of deformation, is analogous to the equation for normal stress, and:
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