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Unformatted text preview: 3. Why does plastic deformation not occur for some ceramics? 3 pts Noncrystalline ceramics do not have a regular atomic structure, so deformation Occurs by flow rather than dislocation movement 4. What is the glass transition temperature (1 pt), its typical range of values (1 pt), and describe why a polymer must be at a higher temperature in order to elastically deform (2 pts). Where elastomers change from brittle to ductile behavior About 50 and 90 deg C or 60 and 130 deg F The polymer molecules must have enough thermal energy to be able to slip by each other as they are stretched...
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This homework help was uploaded on 03/26/2008 for the course ENGR 213 taught by Professor Dr.stubbs during the Fall '04 term at Texas A&M.
- Fall '04