Mechanical Properties Of Metal Flashcards
What is ductility? Which tests are used in conjunction with ductility?
Ductility is the ability of a material to stretch and deform under load without breaking. You either use the bend test or tensile test to express that amount. Ductility == Elongation
Define tensile strength.
Is it the ultimate pull that a material can stand. It’s measured in pounds per square inch (psi) or megapascals (MPa)
What is brittleness?
It’s the tendency of a material to fail suddenly by breaking, without any permanent deformation before failure. A good example is white cast iron.
What is hardness? Which tests are used to measure this?
It’s the ability of a materials to resist penetration, indentation, scratching, and abrasion. The Rockwell and Brinell(ball) hardness tests are used. ASIDE: In steels, hardness is influenced by carbon content.
What is hardness? Which tests are used to measure this?
It’s the ability of a materials to resist penetration, indentation, scratching, and abrasion. The Rockwell and Brinell(ball) hardness tests are used. ASIDE: In steels, hardness is influenced by carbon content.
What is toughness? Describe one method to increase the toughness of metal.
It’s the ability of a metal to withstand a rapidly applied load without breaking. High impact strength (lack of brittleness) == Good indication of toughness.
Tempering is used to draw out some of the hardness of the metal through controlled heating of the hardened area.
EXAMPLE: Spring
What is elasticity?
It’s the ability of metal to return to its original shape and dimensions once the load has been removed.
What is malleability?
It’s the ability of the metal to be cold-worked without a great deal of resistance. Some methods include rolling, pressing, forging.
What is yield strength?
It’s the stress point of a metal where permanent deformation takes place. == Elastic limit.
What is impact strength? What are two common tests for determining this value?
Impact strength == fracture toughness. It’s the ability of a metal to withstand a sharp, high-velocity blow.
Measured in: foot-pounds or joules.
Izod and Charpy tests use a weighted, swinging pendulum to break a notched specimen.
