1. To keep size down many pictures and the links on this presentation were not included for the proceedings. If you wish to receive a CD with the full content please contact me at: somers.anthony.a@edumail.vic.gov.au somers.anthony.a@edumail.vic.gov.au

2. Materials and Structures Anthony Somers Ashwood College Materials Engineering

3. Materials and Structures Introduction Topic Breakdown Demonstrations and Practicals Sample Problems SAC Textbooks Careers Resource CD

4. Materials and Structures Design and materials combine to make successful structures

5. Materials and Structures Why is it important? Tacoma Narrows Bridge

6. Structural Failures

7. Westgate Bridge During construction Two sides not aligned

8. Structural Failures

9. Westgate Bridge Original design40000 vehicles25t max Present day250000 vehicles68t max

10. Structural Flaws Investigating how structures fail……...

11. Structural Flaws Any concerns?

12. Structural Flaws Is this a safe work environment?

13. Materials

14. Price $10,000 Price $1600 Why?

15. Materials and Structures The success of any structure depends on: The design of the structure The materials used in the structure

16. Materials and Structures Topic breakdown Study Design Exams

17. Materials and Structures Exam breakdown Forces in Structures (Structure)31% Stress/Strain Curve (Materials)50% Composites (Steel/Concrete)14% Terms5%

18. Materials and Structures Main Topics with Presentations Forces in Structures Stress/Strain Curve Composites

19. Forces in Structures

20. Understanding Types of loads Forces in structure elements

21. Forces in Structures There are five different types of load –Tension(stretching) –Compression(squashing) –Shear(sliding) –Bending –Torque(rotating) Load Demonstration

22. Forces in Structures Force type analysis in structures Construct structures

23. Stress/Strain Curve

24. Many terms: Stress Strain Young’s Modulus Strength Stiffness Elastic Plastic Brittle Tough Yield Point

25. Stress/Strain Curve Stress and Strain Killer Pythons and Snakes Which is stronger?

26. Stress/Strain Curve Stress and Strain Used to compare materials of different dimensions Stress = Force/Area Strain = Change in Length/Original Length

27. Stress/Strain Curve Stress Strain

28. Stress/Strain Curve Stress Strain Stress Strain Constant speed Measure stress and strain Increasing weight Measure strain Types of Tensile Testing

29. Stress/Strain Curve Tensile Test Video

30. Stress/Strain Curve Material Properties Plastic/Elastic Brittle/Tough Demonstrate with silly putty Available from CSIROSEC

31. Composite Materials Second material inside first to increase toughness Carbon fibre composite, reinforced concrete, fiberglass The reinforcing spreads the energy of the crack Toughness Demonstration

32. Sample Problems

33. For stability: Forces:R = F 1 + F 2 Torque about R:F 1 x 1 =F 2 x 2 x1x1 x2x2 F1F1 F2F2 R Forces in Structures

34. Sample Problems FwFw Beam weight Strut Load Weight x 60° 30° FsFs Forces in Structures

35. Sample Problems Composites

36. Assessment SAC – Great for data analysis 2007 SAC

37. Materials and Structures Textbook Analysis

38. Jacaranda brief on force in structures covers stress/strain curve and composites well

39. Textbook Analysis Nelson force in structures well covered stress/strain curve OK confusing order composites very brief

40. Textbook Analysis Heinemann force in structures very brief stress/strain curve very well covered composites very well covered

41. Careers What do materials engineers do? Select appropriate materials Develop new materials

42. Careers What do materials engineers do? Failure Analysis Test materials

43. Careers What do materials engineers do? Predict material lifetimes

44. Materials and Structures Careers – Monash University Materials Engineering More information: Materials Engineering Brochure www.monash.edu.au/materials

45. Materials and Structures Anthony Somers somers.anthony.a@edumail.vic.gov.au If you want data for data analysis SAC Post on Edulists (edulists.com.au) Experiment ideas to be passed on

46. Structural Failures Tacoma Narrows Bridge (wikipedia) –Sides of bridge solid, catch wind –Deck of bridge too light