1. Homework Check pp

2. Ch. 12: PROPERTIES Mechanical Properties Other Properties
Degradation and Protection

3. Copy the following definitions
Text / Work Books
Text Book – p. 388
Work Book - p. 199
Copy the following definitions

4. MECHANICAL PROPERTIES
How a material reacts when subjected to one or more contraints (p. 388)

5. DEGRADATION OF A MATERIAL
The decline in some of its properties due to the effects of the surrounding environment.

6. PROTECTION OF A MATERIAL
the application of procedures that prevent or delay its degradation.

7. p. 388

8. HARDNESS
Ability to resist indentation or abrasion

9. Elasticity
Ability to return to original shape after undergoing a constraint.

10. RESILIENCE
Ability to resist shocks without breaking

11. DUCTILITY
Ability to be stretched without breaking

12. MALLEABILITY
Ability to be flattened or bent without breaking.

13. STIFFNESS
Ability to retain their shapes when subjected to various constraints

14. p. 389

15. RESISTANCE TO CORROSION
Ability to resist the effects of corrosive substances (water, salts, etc.), which cause the formation of rust or decay.

16. ELECTRICAL CONDUCTIVITY
Ability to carry an electric current

17. THERMAL CONDUCTIVITY
Ability to transmit heat
vs.

18. Categories of materials and their properties

19. WOOD
Is a material obtained by harvesting and processing trees (wkbk p. 201)

20. MODIFIED WOOD
Is treated wood or a material made from wood mixed with other substances

21. Properties

22. SPECIES OF TREES
HARDWOOD
SOFT WOOD

23. HARDNESS, ELASTICITY, RESILIENCE & TOUGHNESS

24. LOW THERMAL & ELECTRICAL CONDUCTIVITY

25. EASY TO SHAPE & ASSEMBLE

26. COLOURS & SHADES

27. LIGHT or HEAVY

28. Degradation
Microorganism
Fungi
Insects

29. Pine Beetle

30. PROTECTION
PRESSURE TREATING
ROASTING

31. A CERAMIC
Is a solid material obtained by heating inorganic matter containing various compounds, usually oxides.

32. Properties

33. LOW ELECTRICAL CONDUCTIVITY

34. HIGH DEGREE OF HARDNESS

35. LOW THERMAL CONDUCTIVITY

36. RESISTANT TO CORROSION

37. METALS & ALLOYS:

38. A METAL
Is a material extracted from a mineral ore.

39. AN ALLOY
Is a mixture of a metal with one or more other substances.

40. Properties

41. Good thermal and electrical conductivity

42. Ductile

43. Malleable

44. Degradation

45. OXIDATION = Corrosion = Rust

46. Protection

47. COATINGS
Chrome
Enamel
Galvanize using a protective layer of zinc

48. STEEL HEAT TREATMENTS (pg 201)
Are methods of enhancing certain mechanical properties of steel through periods of heating.

49. PLASTICS
Are materials made of polymers, to which other substances may be added to obtain certain desirable properties (p. 205)
Developed from FOSSIL FUELS such as petroleum and natural gas

50. A THERMOPLASTIC
Is a plastic that becomes soft enough when heated to be molded or remolded and that hardens enough when cooled to hold its shape

51. A THERMOSETTING PLASTIC
Is a plastic that remains permanently hard, even when heated

52. A COMPOSITE
Is formed by combining materials from different categories to obtain a material with enhanced properties.

53. Carbon Fiber

54. Homework
Work Book - p