testing materials 1.1 Flashcards
tensile testing (workshop)
clamping samples of same length and thickness
apply load to unclamped end
how defects under load
how much load can bear
toughness testing (workshop)
clamped
hit with same force using hammer
tough= absorb
brittle= bend shatter
hardness testing (workshop)
abrasive: running file= fewest scratches is hardest
surface indentation: dot punch hammer= dot punch on surface
smaller indent the harder material
malleability and ductility (workshop)
clamp in vide try to bend at 90 degrees
cracks on outside= ductility
damage on inside= malleability
corrosion testing (workshop)
places outside in an area exposed to weather effects and left for a certain length of time
conductivity (workshop)
electrical: multimeter measure the resistance= the higher the resistance the lower the conductivity
thermal: thermometer bunsen burner lit at end record time it takes for the temperature to reach the set point at the other end of the material sample
tensile testing (industrial)
placed into tensometer put under tension and stretched
worm drives it away
elastic limit given
toughness (industrial)
izod impact test
held vertically jn the vids of the test machine a pendulum is released from a set position and swings to strike the test piece
material that absorbs the most impact is the toughest
hardness testing (industrial)
rockwell: preload applied using a diamond indenter which breaks through surface additional load applied for time
brinell: steel ball forced into surface diameter of indent measured
vickers pyramid: diamond square based pyramid microscope used to measure indent
ductility and malleability (industrial)
bend test
bending machine and held bends to predertiminde angle
material inspected for cracks or defects
non destructive testing
ultrasonic: transducer develops sound waves pulsed into material
x-ray: observation of tiny details within the material
