EML 5562 Materials Science

EML 5562 Materials Science - Stress-Strain Relationships...

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Stress-Strain Relationships • Stress is a measure of the force per unit area • Strain is a measure of the unit change in length ( uniaxial stress) or angle (shear) lastic deformation relates the stress to • Elastic deformation relates the stress to strain through the proportionality constant of the elastic modulus, E • Poisson’s ratio, υ , relates the contraction in the x,y direction with the elongation under load in the z direction
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Relations of Stress-Strain A) Uniaxial tension B) Compression C) Shear D D) Torsion A B C D
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Mechanical Materials Properties Elastic Modulus- determines the elastic response of a material following Hooke’s law. Determines by uniaxial tensile testing, acoustic transmission, and vibrational response Yield Point and Ultimate Tensile Strength ( UTS)- yield point determines the onset of plastic deformation as determined by a strain offset( usually .2%), while UTS determines the maximum strength Coefficient of Thermal Expansion- measures the expansion over temperature, usually in microinches/in/ o C. Thermally induced strains occur due to the mismatch between dissimilar materials. Measured with a dilatometer
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Typical Stress-Strain Behavior Y.P. M = Ultimate Tensile Strenght Y.P. = Yield Point
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Elastic Stress-Strain Relationships
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Poisson’s Ratio υ =- ε x / ε z
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Bimetal Strip
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Bimetal Strip (Cont.)
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Stress-Strain Distribution in an Adhesively Bonded Joint Typical variations of shear and peel stresses in a single lap joint for n adhesively bonded an adhesively bonded joint.Note that the shear stress is non- zero at the ends.
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Structure
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This note was uploaded on 09/15/2011 for the course EML 5562 taught by Professor Staff during the Summer '11 term at FIU.

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EML 5562 Materials Science - Stress-Strain Relationships...

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