Part 1 - Methods of investigating and testing materials Flashcards
1
Q
corrosion testing
A
- place equally sized material samples outside in the area exposed to the effects of weather and leave for a settling of time.
- mysterious can be visually inspected for surface corrosion.
2
Q
electricity conductivity test
A
Connecting two samples of the same dimensions and marker set distance to post multimeter probes. Measure the resistance on multimeter. The higher the resistance the lower the conductivity.
3
Q
Thermal conductivity test
A
- collect you two samples of the same dimensions
- measure distance from one end of you to a place of thermometer there.
- light a Bunsen burner under the other end of material.
- record the time it takes the temperature to reach the set point at the other end of the material sample.
- the time of hate the highest thermal conductivity of a material
4
Q
Tensile strength
A
- the standard test piece is held in a clamp at each end
- 1 clamp is fixed and the other moves on a worm Drive Gear mechanism putting a material under tension.
- the test piece is stretched, the load and distance travelled is plotted giving information on elastic limit, yield point, maximum load and final breaking point after necking.
5
Q
Tougness
A
- the izod impact test is used to test the toughness of a material
- a notched test piece is held vertically in the vice of the machine
- a pendulum is released from a set position and swings to strike the test piece
- the energy absorbed for the test piece is calculated from the height the pendulum swings to after it hits the test piece
- the material that absorbes the most impact is the toughest and gives the least pendulum swing
- brittle materials absorb less energy and the Pendulum swings further
6
Q
Hardness
A
- the Rockwell hardness test Is used to test hardness of a material
- all hardness tests involved a load being applied to a material with the resultant indentation determining the hardness of the material
- the smaller the indentation the harder the material
