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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.
- Spring '07