FailureTheories - Mechanical failure & Measuring strain...

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Unformatted text preview: Mechanical failure & Measuring strain & Measuring stress & Why materials exhibit elastic behaviour & Toughness & Hardness & Stresses on oblique planes & Failure theories Applying load - mechanical Applying Loads (hydraulic) Quarter bridge strain gauge circuit . LVDT Circuit Dial Gauges Digital demec gauge Mechanical failure & Measuring strain & Measuring stress & Why materials exhibit elastic behaviour & Toughness & Hardness & Stresses on oblique planes & Failure theories Measuring Stress http://www.rdpe.com/uk/hiw-sglc.htm Measuring modulus of elasticity Mechanical failure & Measuring strain & Measuring stress & Why materials exhibit elastic behaviour & Toughness & Hardness & Stresses on oblique planes & Failure theories Why Materials show elastic behaviour Distance between nucleii Compression Tension Attraction Repulsion Force between nucleii Mechanical failure & Measuring strain & Measuring stress & Why materials exhibit elastic behaviour & Toughness & Hardness & Stresses on oblique planes & Failure theories Toughness Stress (force) Strain (distance) Final strain Area = average stress final strain = Energy absorbed = work done 2 Toughness For an elastic system Mechanical failure & Measuring strain & Measuring stress & Why materials exhibit elastic behaviour & Toughness & Hardness & Stresses on oblique planes & Failure theories Shear stress and strain Shear force Shear Force Area resisting shear Shear displacement (x) Shear strain is angle L Stress on oblique planes = y sin(2 ) Movement of dislocation Grain Boundary Mechanical failure & Measuring strain & Measuring stress & Why materials exhibit elastic behaviour & Toughness & Hardness & Stresses on oblique planes & Failure theories Material subject to two perpendicular stresses = 0.5 ( x- y ) sin 2 Mechanical failure & Measuring strain & Measuring stress & Why materials exhibit elastic behaviour & Toughness & Hardness & Stresses on oblique planes & Failure theories The Von Mises criterion...
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This note was uploaded on 01/18/2012 for the course AAE 352 taught by Professor Chen during the Fall '08 term at Purdue University-West Lafayette.

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FailureTheories - Mechanical failure & Measuring strain...

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