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Mechanical Properties of Metals
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Terms in this set (27)
Engineering stress
the amount of instantaneous force applied over the original area, sigma
(in MPa or psi)
Engineering strain
the change in the length divided by the initial length, epsilon
(unitless)
modulus of elasticity
Young's modulus; relationship between stress and strain
elastic deformation
deformation in which stress and strain are proportional
decreases
with increasing temperature, the modulus of elasticity
nonpermanent
elastic deformation is
G
shear modulus
shear modulus
the slope of the linear elastic region of the shear stress-strain curve
nu
Poisson's ratio
Poisson's ratio
the ratio of the lateral and axial strains
anisentopic
the elastic behavior varies with crystallographic direction
permanent
plastic deformation is
yeilding
the stress level at which plastic deformation begins is where ___ occurs
proportional limit
represents the onset of plastic deformation on a microscopic level, where point P would be labeled
yield strength
found by following the straight line constructed parallel to the elastic portion of the stress strain curve at an offset of 0.002 until it crosses the curve in the plastic deformation region
(in MPa or psi)
magnitude of yield strength
measure of a metal's resilience to plastic deformation
TS
tensile strength
tensile strength
is the stress at the maximum on the stress-strain curve, corresponding to the maximum stress that can be sustained by a structure in tension
Ductility
measure of the degree of plastic deformation that has been sustained at fracture; can be expressed as percent elongation and percent reduction in area
brittle
metal that experiences little or no plastic deformation upon fracture, have a fracture strain of less than 5%
resilience
the capacity of a material to absorb energy when it is deformed elastically, and to have the energy recovered upon reloading
Ur
modulus of resilience
fracture toughness
property that is indicative of a material's resistance to fracture when a crack is present
True stress
the load F divided by the instantaneous cross sectional area Ai
True strain
the log natural of one plus epsilon
n
strain hardening exponent, a measure of how much stronger and harder a metal becomes as it is plastically deformed
strain hardened
the process that makes metals stronger the more that they are plastically deformed
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