AC LEC 21-09

AC LEC 21-09 - Impact Toughness Strain Rate(d ε/dt Creep...

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Lecture 21- Effect of Temperature and Strain Rate on the Mechanical Properties Temperature elastic properties ductile/brittle transition Strain Rate tensile impact creep
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Effect of Temperature on Elastic Properties
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PMMA: Temperature Effect on Tensile Properties PMMA elastic plastic Thermoplastic Brittle to Ductile transition at >T
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Vulcanization of Rubber Cross Linking of Chains
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Effect of Temperature on Plastic Properties
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PMMA: Temperature Effect on Tensile Properties PMMA elastic plastic Thermoplastic Brittle to Ductile transition at >T
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Why did the ship break?
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Liberty Ship SS Schenectady 1943 Why did the ship break?
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Impact Testing: One Measure of Toughness as a Function of Temperature Specimen
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Temperature Dependence of Impact Properties DBTT
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Charpy Specimens: Effect of Temperature on Fracture Surface Appearance
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Fractography: 1018 steel @300K @90K Primarily Microvoid Coalescence Primarily Cleavage BCC
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Fractography: 304 steel @300K @80K Primarily Microvoid Coalescence Primarily Microvoid Coalescence FCC
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Annealed Steel: Effect of Carbon Content on
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Unformatted text preview: Impact Toughness Strain Rate (d ε /dt) Creep and Stress Rupture of Metals Creep: Copper Alloy 225ºC and 230 MPa Steady State Creep Rate = ∆ε / ∆ t Creep: Effect of Stress and Temperature Note: ∆ε / ∆ t Increases as Stress Increases Rupture Time: Effect of Stress and Temperature in Low Carbon Nickel Alloy Temp ▲ Creep of Jet Engine Turbine Blade Evolution of Turbine Blade Microstructure to Improve Creep Resistance Equiaxed Crystal Structure Single Crystal From Cervenka, Rolls Royce, 2000 Directionally Solidified Structure Creep in Polystyrene: Effect of Stress @ 77K Creep Modulus = Applied stress/Creep strain Polymer Creep Modulus @ 73K Melting Points of Ceramic Compounds Summary - Lecture 21 Lower temperatures: Strength Increases Ductility Decreases DBTT: exhibited by BCC metals and thermoplastics Creep resistance is strongly related to the material’s ABSOLUTE melting point. Materials creep appreciably above (0.5 T m )...
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This note was uploaded on 02/27/2009 for the course MSE 150 taught by Professor Wittig during the Spring '07 term at Vanderbilt.

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AC LEC 21-09 - Impact Toughness Strain Rate(d ε/dt Creep...

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