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Materials and Structures Anthony Somers Ashwood College Materials Engineering
Materials and Structures Introduction Topic Breakdown Demonstrations and Practicals Sample Problems SAC Textbooks Careers Resource CD
Materials and Structures Design and materials combine to make successful structures
Materials and Structures Why is it important? Tacoma Narrows Bridge
Structural Failures
Westgate Bridge During construction Two sides not aligned
Structural Failures
Westgate Bridge Original design40000 vehicles25t max Present day vehicles68t max
Structural Flaws Investigating how structures fail……...
Structural Flaws Any concerns?
Structural Flaws Is this a safe work environment?
Materials
Price $10,000 Price $1600 Why?
Materials and Structures The success of any structure depends on: The design of the structure The materials used in the structure
Materials and Structures Topic breakdown Study Design Exams
Materials and Structures Exam breakdown Forces in Structures (Structure)31% Stress/Strain Curve (Materials)50% Composites (Steel/Concrete)14% Terms5%
Materials and Structures Main Topics with Presentations Forces in Structures Stress/Strain Curve Composites
Forces in Structures
Understanding Types of loads Forces in structure elements
Forces in Structures There are five different types of load –Tension(stretching) –Compression(squashing) –Shear(sliding) –Bending –Torque(rotating) Load Demonstration
Forces in Structures Force type analysis in structures Construct structures
Stress/Strain Curve
Many terms: Stress Strain Young’s Modulus Strength Stiffness Elastic Plastic Brittle Tough Yield Point
Stress/Strain Curve Stress and Strain Killer Pythons and Snakes Which is stronger?
Stress/Strain Curve Stress and Strain Used to compare materials of different dimensions Stress = Force/Area Strain = Change in Length/Original Length
Stress/Strain Curve Stress Strain
Stress/Strain Curve Stress Strain Stress Strain Constant speed Measure stress and strain Increasing weight Measure strain Types of Tensile Testing
Stress/Strain Curve Tensile Test Video
Stress/Strain Curve Material Properties Plastic/Elastic Brittle/Tough Demonstrate with silly putty Available from CSIROSEC
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
Sample Problems
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
Sample Problems FwFw Beam weight Strut Load Weight x 60° 30° FsFs Forces in Structures
Sample Problems Composites
Assessment SAC – Great for data analysis 2007 SAC
Materials and Structures Textbook Analysis
Jacaranda brief on force in structures covers stress/strain curve and composites well
Textbook Analysis Nelson force in structures well covered stress/strain curve OK confusing order composites very brief
Textbook Analysis Heinemann force in structures very brief stress/strain curve very well covered composites very well covered
Careers What do materials engineers do? Select appropriate materials Develop new materials
Careers What do materials engineers do? Failure Analysis Test materials
Careers What do materials engineers do? Predict material lifetimes
Materials and Structures Careers – Monash University Materials Engineering More information: Materials Engineering Brochure
Materials and Structures Anthony Somers If you want data for data analysis SAC Post on Edulists (edulists.com.au) Experiment ideas to be passed on
Structural Failures Tacoma Narrows Bridge (wikipedia) –Sides of bridge solid, catch wind –Deck of bridge too light