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Unformatted text preview: Terms used with tensile testing Applying a tensile force (i.e. pulling on it) Engineering Stress () = (applied force perpendicular to the cross-sectional area) h (initial cross-sectional area) = F/A psi, Pa, N/m 2 Common tensile Specimens dog-bone specimens o A = (/4)(d ) 2 where d is in the very center Engineering Strain () = change in length = initial length is the original length of specimen were all of the deformation will take place o Compression not as common more difficult than tensile not as informative for structural applications o Hookes Law E = / E modulus of elasticity, youngs modulus Stress and strain are linearly proportional Typical values of the modulus for metals 40-400 GPa stiffer materials have larger modulus (smaller , stretches less)...
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- Fall '07