Term
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Definition
| This is the point at which the curve first begins to deviate from a straight line. |
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Term
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Definition
No permanent set will be observable
in the specimen if the load is removed at this point |
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Term
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Definition
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Term
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Definition
Ductile materials _________ much more
than ________ materials |
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Term
| Young’s modulus or the modulus of elasticity |
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Definition
the slope of the linear part of the stress-strain
curve |
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Term
| Young’s modulus or the modulus of elasticity |
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Definition
is a measure of the
stiffness of a material |
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Term
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Definition
If the specimen is loaded beyond this
point, the deformation is said to be plastic |
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Term
|
Definition
If the specimen is loaded beyond this
point,the material will take on a permanent set
when the load is removed |
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Term
|
Definition
a point at which the strain begins to
increase very rapidly without a corresponding increase in stress |
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Term
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Definition
Point a corresponds to a definite
or stated amount of permanent set, usually 0.2 percent of the original gauge length |
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Term
| ultimate, or tensile, strength S u or S ut |
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Definition
| is the maximum stress reached on the stress-strain diagram |
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Term
|
Definition
something that occurs in a part, usually as
a result of its being assembled into a machine and loaded. |
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Term
|
Definition
a built-in property of a mate-
rial, or of a mechanical element, |
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Term
| shear modulus or the modulus of rigidity |
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Definition
| the coefficient of elasticity for a shearing force |
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Term
|
Definition
| The ratio of shear stress to the displacement per unit sample length (shear strain) |
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Term
|
Definition
| Ultimate strength determined in a flexure or torsion test |
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Term
|
Definition
| maximum shear stress in the extreme fiber of a circular member at failure. |
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Term
|
Definition
| The maximum point on a torque-twist diagram, |
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Term
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Definition
| The capacity of a material to absorb energy within its elastic range |
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Term
|
Definition
the energy absorbed per
unit volume without permanent deformation, and is equal to the area under the stress-
strain curve up to the elastic limit. |
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Term
|
Definition
| capacity of a material to absorb energy without fracture |
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Term
|
Definition
the energy absorbed per unit
volume without fracture, which is equal to the total area under the stress-strain curve up
to the fracture point |
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Term
|
Definition
the process of plastic straining below the recrystallization temperature
in the plastic region of the stress-strain diagram |
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Term
|
Definition
material now has a higher yield point, is less ductile as a result of a reduction in
strain capacity, and is said to be |
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Term
|
Definition
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Term
|
Definition
| the area after the load P i has been released |
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Term
|
Definition
| The resistance of a material to penetration by a pointed tool |
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Term
|
Definition
| scale based on the indentation hardness of a material |
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Term
|
Definition
| determines the hardness by measuring the depth of penetration of an indenter under a large load compared to the penetration made by a preload |
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Term
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Definition
| characterizes the indentation hardness of materials through the scale of penetration of an indenter, loaded on a material test-piece. |
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Term
|
Definition
provides a convenient and nondestructive means of estimating the
strength properties of materials |
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Term
|
Definition
| An external force applied to a structure or part |
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Term
|
Definition
if the time of
application is less than one-third the lowest natural period of vibration of the part or
structure an external force applied to a structure or part is |
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Term
| Charpy or Izod notched bar test |
|
Definition
utilize bars of
specified geometries to determine brittleness and impact strength |
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Term
| Charpy or Izod notched bar test |
|
Definition
utilize bars of
specified geometries and swinging pendulum to determine brittleness and impact strength |
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Term
|
Definition
| the energy absorbed by the specime in a Charpy or Izod test |
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Term
|
Definition
what properties are affected by the temperature of the
operating environment |
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Term
|
Definition
| continuous deformation under load |
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Term
|
Definition
specimens can be permanently
deformed during the tests, even though the actual stresses are less than the
yield strength of the material obtained from short-time tests made at the same temperature. |
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