gigamegaM106microμ10-6kilok103nanon10-9centic10-2picop10-12k = 1.38×10-23 J/atom⋅K = 8.62×10-5 eV/atom⋅KR = 8.314 J/mol⋅K NA = 6.023×1023 atoms/mol-19-31Chapter 6 – Mechanical Properties of MetalsTypes of stresses: Tensile, Compressive, Shear, Biaxial Tension Compression, Hydrostatic.Stress: 0FAσ=, Strain: 0llε∆=Shear stress: 0FAτ=, Shear strain: 0tanllγθ∆==Stress and strain are proportional to each other using Eσε= (E – Young’s Modulus) orG=(G – Shear Modulus). Physics of elasticity: 22FUErr∂∂=∂∂::, Energy stored: 200122VWVE==, Poisson’s ratio: xzυ= -(bottom of ratio – strain in direction of applied force) ( 2921EG=+. Deformation: Metallic materials deform elastically (reversible) until strains of about .005. After that, plastic (irreversible) deformation occurs. *Note: Elastic doesn’t conserve volume, plastic does.*Work hardening: After they yield, metals get harder to deform. Tensile Strength = F
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