ExamStudyGuideMaterials101

ExamStudyGuideMaterials101 - Materials 101 Important Topics...

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Materials 101 Important Topics for Final Exam 1. Characteristics of different types of bonding in materials 2. Relate elastic modulus of crystals & glass to potential energy well - energy elasticity 3. Structure of crystalline metals ( fcc, bcc, hcp, bct etc) 4. Structure of glasses 5. Structure of amorphous polymers - concept of random coil & its size 6. Semicrystalline polymer structure 7. Fiber composite materials including high E fibers and their structure 8. Elastic modulus of composite materials {parallel to fibers , perpendicular to fibers} 9. Elasticity of rubber - entropy elasticity 10. Thermodynamics of deformation — effect of T 11. Dependence of rubber modulus on network strand density ν x 12. Coiling and uncoiling times and their T dependence near Tg in polymers 13. Viscoelasticity and its relation to coiling and uncoiling times in elastomers 14. Damping, mechanical hysteresis and viscoelasticity 15. Principal stresses - stress at a point 16. Maximum shear stress given principal stresses 17. Maximum normal stress given principal stresses 18. Work per unit volume from stress strain curve 19. Young’s modulus 20. Yield stress (0.2% offset yield stress) 21. Nominal stress versus true stress 22. Nominal strain versus true strain 23. Strain hardening (true stress vs. true strain) 24. Strain hardening exponent 25. Strain rate sensitivity exponent 26. Ultimate tensile stress - what is it and why does it occur? 27. Necking (post yield) 28. How does one measure the strain to failure in a tension test 29. Yield criteria 30. Hardness testing and relation of hardness to yield stress 31. Dislocation - concept of dislocation as boundary between slipped and unslipped material 32. Theoretical critical shear stress vs. measured critical shear stress 33. Burgers vector of dislocation b 34. Edge dislocation 35. Screw dislocation 36. Mixed dislocation 37. Dislocation slip plane 38. Dislocation loops - b constant along line 39. Dislocation line tension 40. Force on dislocation due to resolved shear stress 41. Barriers to dislocation motion: intrinsic 42. Barriers to dislocation motion: impurity atoms ( substitutional interstitial) 43. Barriers to dislocation motion: immobile dislocations 44. Barriers to dislocation motion: grain boundaries 45. Barriers to dislocation motion: second phase particles 46. Cutting of second phase particles by dislocations 47.
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