BIOE-3020 Study Guide - Midterm Guide: Collagen, Thermodynamics, Cadherin
25 Aug 2016
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Surface vs bulk properties: surface determine the material"s interactions with the body (biocompatibility) Roughness: bulk determine the material"s function. Thermodynamics of surfaces: loading uniaxial, combined, multi-axial, and arbitrary, stress and strain. Normal forces perpendicular to the surface. Hooke"s law: =e (e is young"s modulus: larger the e, more strong (stiff) the material. Poisson"s ratio: dimensional change in non-loading direction, most commonly around 3: v = - 2/ 1 = - 3/ 1 (1 is loading dir, 2,3 non-loading) Hooke"s law of elasticity = =g (g is shear modulus: elastic vs plastic response. Elastic reversibly, generally valid for small strains, and bonds are stretched but not broken. Plastic irreversible, bonds are broken: % elongation: (change in length/original length)x100, material behavior: A proportional limit initial curve is no longer linear. B yield point defined by a small permanent strain of 0. 2% C end of plastic region, start of strain hardening.
