MSE lab 4 - The thermoplastics' chains can slide over one...

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Chase Machemehl Cold Rolled 0 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09 0 50 100 150 200 250 Strain Stress Series1 Yield Stress = .085 UTS = .085 Fracture Strain = .063 Material Elastic Modulus Gpa Yield Stress Mpa UTS Mpa Fracture Strain Mpa Titanium 104.41 835 1002 0.12 Tempered Steel 199.818 1610 1682 0.149 Low C Steel 106.57 243.3 296.4 0.43 2024 Aluminum 69.00243309 352.9 496.2 0.224 Cast Iron 143.558 129.6 416 0.00432 Nylon 2.86 85.41 88.4 0.445 Polyethylene 0.364 21.76 22.59 6.53 Phenolic 4.829715899 50.29 52 52 1. The bond strength of the metallic materials are directly related to the modulus of elasticity 2. Aluminum, Titanium, Cast Iron, from weakest to strongest bond strengths. 3. The microstructure defines the ductility of a material 4. The lower strangth materials exhibit a greater ductility. 5. Phenolic is a thermosetting, Nylon and Polythylene are thermoplastics 6. Thermosetting polymers have permanently crosslinked chains that show less ductility, while the thermoplastics' chains are held together by weaker hydrogen bonds.
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Unformatted text preview: The thermoplastics' chains can slide over one another and are more ductile. 7. The Thermosetting plastics require more stress before fracture due to the formation of crazes prior to fracture. Crazes form in areas of high stress and consist of aligned molecular chains and interdispersed voids. 8. After overcoming the initial resistive forces to sliding the chains along one another (The initial spike), The chains are freely sliding and exhibit less restive force to movement untill the chains are completely aligned and all of the force applied goes towards breaking the interchain bonds. Yield Stress = . 091 UTS = . 132 Fracture strain = 897 Cold Working effects Yield Stress by increasing it. Cold Working lowers Ultimate Tensil Strength. Cold Working lowers the failure strain greatly. Annealed 0.02 0.04 0.06 0.08 0.1 0.12 0.14 200 400 600 800 1000 Strain Stress Series1...
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This lab report was uploaded on 04/07/2008 for the course MSE 150 taught by Professor Wittig during the Spring '07 term at Vanderbilt.

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MSE lab 4 - The thermoplastics' chains can slide over one...

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