Testing of metals Flashcards
Tensile Test
Tensile strenght, yield strenght, elongation,, Hardness
common impact strength tests
Izod and Charpy tests
Destructive testing
testing by causing harm to the materials after process.
Chemical Quality Control
tempeture, chemical
Fatigue test
a test to measure a constant load being applied
Elongation % of tensile test
(growth rate/ orginal) x 100
Tensile test
tensile strenght, yield strenght( extenometert, elongaiton, Hardness
three most important mechanical properties of metals
Hardness, strength, ductility
Brineel hardness test formula
https://www.desmos.com/scientific
Vickers hardness value formula
= 0.1891 F/d^2
each hardness indenter
Brinell caliph ball, Rockwell diamond, VIckers Diagonal SHaped
pros and cons of Brinell test
can be used for surfaces that are too course or rough. not good for too hard materials or thin sheets. ball shaped calipher
pros and cons of Rockwell
is cheap and quick to set up. uses diamond shaped calipher. Uses cone shaped calipher
pros and cons Vickers
can be used to measure the precise micro hardness using a microscope. however takes quit a long time to set up
Impact tests that uses dimensions to measure the energy used
Chirpy v notch
Defined as the point of stress just before a material yields
Modulus fo rupture bend test
Creep test
the measure of wearing down through a constant loaded force over time. measure with an extensometer and higher temperature increases the process.
what are the two types of metal failure?
Brittle failure: Cleavage “breaking part of atoms” ductile failure shear “ slipping of atoms”
Two types of stress during fatigue tests
Tensile and Compression
Many atoms sliding past one another on many lines called blank planes
Slip bands. Deformation forms and becomes more ductile and less hard