#### Stress strain and youngs modulus pdf

Activity—Forces, Elasticity, Stress, Strain and Young’s Modulus Handout 2 Elasticity and Young’s Modulus Elasticity describes a material property in which the material returns to its original shape after stress has been applied and then removed. When thinking about elasticity, think about a coiled metal spring or a rubber band. The elastic modulus is the constant of proportionality between stress and strain Three types of moduli: Young’s modulus, shear modulus, bulk modulus Elastic Properties of Solids o FL Y AL Δ = Young’s Modulus: Y Strain Stress Stress = Y x Strain or = Stress (F/A) has units of N/m2 1 N/m2 = 1 Pascal (Pa) Young’s Modulus: Elasticity in Length. Note: Hooke’s Law describes only the initial linear portion of the stress-strain curve for a bar subjected to uniaxial extension. The slope of the straight-line portion of the stress-strain diagram is called the Modulus of Elasticity or Young’s Modulus. E = σ/ε (normal stress – strain) G = τ/γ (shear stress – strain).