ME 2733 Lecture : Materials Final Notes Sheet
Document Summary
What bonds exist in rubber: covalent with some van der waals. What rule is used to calculate the modulus of elasticity: hooks law. Fine pearlite v coarse pearlite: fine is stronger. 3 main divisions of composite materials: particle reinforced, fibre reinforced, structural composites. Cold working is the strengthening of a metal by plastic deformation. This strengthening occurs because of dislocation movements and dislocation generation within the crystal structure of the material. Diamond v graphite electro conductivity: the fourth valence electrons remain free which enable an easy flow of electron through graphite and that is why it is made a good conductor of electricity. But this does not happen in case of diamond. In diamond, each carbon atom makes bonds with four other carbon atoms. So there is no free electron with carbon atoms to conduct electricity. Decrease in tendency of a polymer to crystallize w/ increasing molecular weight.
