# Shared Flashcard Set

## Details

Machine Design one
A bunch of materials definitions
39
Mechanical Engineering
02/18/2013

## Additional Mechanical Engineering Flashcards

Term
 proportional limit
Definition
 This is the point at which the curve ﬁrst begins to deviate from a straight line.
Term
 proportional limit
Definition
 No permanent set will be observablein the specimen if the load is removed at this point
Term
 proportional limit
Definition
 Point pl
Term
 deform, brittle
Definition
 Ductile materials _________ much morethan ________ materials
Term
 Young’s modulus or the modulus of elasticity
Definition
 the slope of the linear part of the stress-straincurve
Term
 Young’s modulus or the modulus of elasticity
Definition
 is a measure of thestiffness of a material
Term
 elastic limit
Definition
 If the specimen is loaded beyond thispoint, the deformation is said to be plastic
Term
 elastic limit
Definition
 If the specimen is loaded beyond thispoint,the material will take on a permanent setwhen the load is removed
Term
 yield point
Definition
 a point at which the strain begins toincrease very rapidly without a corresponding increase in stress
Term
 yield strength
Definition
 Point a corresponds to a deﬁniteor stated amount of permanent set, usually 0.2 percent of the original gauge length
Term
 ultimate, or tensile, strength S u or S ut
Definition
 is the maximum stress reached on the stress-strain diagram
Term
 stress
Definition
 something that occurs in a part, usually asa result of its being assembled into a machine and loaded.
Term
 strength
Definition
 a built-in property of a mate-rial, or of a mechanical element,
Term
 shear modulus or the modulus of rigidity
Definition
 the coefficient of elasticity for a shearing force
Term
 Modulus of Rigidity:
Definition
 The ratio of shear stress to the displacement per unit sample length (shear strain)
Term
 modulus of rupture
Definition
 Ultimate strength determined in a flexure or torsion test
Term
 modulus of rupture
Definition
 maximum shear stress in the extreme fiber of a circular member at failure.
Term
 torsional yield strength
Definition
 The maximum point on a torque-twist diagram,
Term
 resilience
Definition
 The capacity of a material to absorb energy within its elastic range
Term
 modulus of resilience
Definition
 the energy absorbed perunit volume without permanent deformation, and is equal to the area under the stress-strain curve up to the elastic limit.
Term
 toughness
Definition
 capacity of a material to absorb energy without fracture
Term
 modulus of toughness
Definition
 the energy absorbed per unitvolume without fracture, which is equal to the total area under the stress-strain curve upto the fracture point
Term
 Cold working
Definition
 the process of plastic straining below the recrystallization temperaturein the plastic region of the stress-strain diagram
Term
 strain-hardened
Definition
 material now has a higher yield point, is less ductile as a result of a reduction instrain capacity, and is said to be
Term
 % reduction in area
Definition
 a measure of ductility
Term
 cold-work factor W
Definition
 the area after the load P i has been released
Term
 Hardness
Definition
 The resistance of a material to penetration by a pointed tool
Term
 Rockwell hardness
Definition
 scale based on the indentation hardness of a material
Term
 Rockwell hardness
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
Term
 Brinell hardness
Definition
 characterizes the indentation hardness of materials through the scale of penetration of an indenter, loaded on a material test-piece.
Term
 Hardness testing
Definition
 provides a convenient and nondestructive means of estimating thestrength properties of materials
Term
Definition
 An external force applied to a structure or part
Term
Definition
 if the time ofapplication is less than one-third the lowest natural period of vibration of the part orstructure an external force applied to a structure or part is
Term
 Charpy or Izod notched bar test
Definition
 utilize bars ofspeciﬁed geometries to determine brittleness and impact strength
Term
 Charpy or Izod notched bar test
Definition
 utilize bars ofspeciﬁed geometries and swinging pendulum to determine brittleness and impact strength
Term
 impact value
Definition
 the energy absorbed by the specime in a Charpy or Izod test
Term
 strength and ductility
Definition
 what properties are affected by the temperature of theoperating environment
Term
 creep
Definition
 continuous deformation under load
Term
 creep
Definition
 specimens can be permanentlydeformed during the tests, even though the actual stresses are less than theyield strength of the material obtained from short-time tests made at the same temperature.
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