Shared Flashcard Set

Details

Intro to Mechanical Properties
N/A
53
Engineering
Undergraduate 3
12/12/2015
Click here to study/print these flashcards.

Create your own flash cards! Sign up here.

Additional Engineering Flashcards

 

 

Cards

Term
The tensile force divided by the original cross-sectional area of a specimen is the engineering normal ____.
 Definition
stress
Term
The change in length resulting from an applied force on a specimen divided by the original length is the engineering ___.
 Definition
strain
Term
The negative of the ratio of the strain transverse to an applied force divided by the strain parallel to the applied force is equal to the ____ ratio.
 Definition
Poisson's
Term
The tensile force divided by the actual cross-sectional area of a specimen is the ___ stress.
 Definition
true
Term
If an applied stress is equal in three perpendicular directions, the stress is ___.
 Definition
hydrostatic.
Term
A(n) ___ material has properties that are equal in three perpendicular directions.
 Definition
isotropic
Term
In a tensile specimen with uniform strain, the true strain is equal to the natural log of 1 plus the ___.
 Definition
engineering strain
Term
Recovered strain is ___ strain.
 Definition
elastic
Term
Permanent strain is ___ strain.
 Definition
plastic
Term
In an isotropic material subject to a hydrostatic stress, the volumetric strain is equal to ___ times the strain in the x direction.
 Definition
three
Term
A shear strain causes changes in ___ in a specimen.
 Definition
angle
Term
The linear relationship between stress and elastic strain is known as _____.
 Definition
Hooke's law
Term
_____ is equal to the ratio of the applied stress to the elastic strain.
 Definition
Young's Modulus
Term
In a nonlinear elastic material, the ratio of the applied stress to the total strain is the _____.
 Definition
secant modulus
Term

 

In a nonlinear elastic material, the ratio of the increment in applied stress to the increment in strain measured at the total strain is the___. 

 Definition
tangent modulus
Term
The ratio of the hydrostatic stress to the elastic volumetric strain is equal to the ____.
 Definition
bulk modulus
Term
A material that requires time to fully recover after the stress is reduced to 0 is ____.
 Definition
anelastic
Term
In crystalline metals, plastic strain at low temperature is due to ____ motion.
 Definition
dislocation
Term
In glass, plastic strain is due to the ____ and reformation of atomic bonds.
 Definition
breaking
Term
In a crystalline metal at low temperature, the magnitude of the plastic strain is equal to the mobile dislocation density time the Burger's vector times the average ___ moved by the dislocations.
 Definition
distance
Term
In the tensile test of single crystals, the proportional limit stress depends upon the angle of the slip plane and the slip ___ relative to the tensile axis.
 Definition
direction
Term
In the tensile test of single crystals, the proportional limit stress is not constant; the ___ is constant
 Definition
critical resolved shear stress
Term
The elastic modulus of a material, except for elastomers, is proportional to the ___ of the interatomic potential.
 Definition
curvature
Term
The tensile stress where plastic strain begins is equal to the ____ limit.
 Definition
proportional
Term
The tensile stress where plastic strain is equal to .002 is equal to the ___ stress.
 Definition
yield
Term
The modulus of ___ is the maximum strain energy that a material can absorb and then fully return when unloaded.
 Definition
resilience
Term
At the ultimate tensile strength, the slope of the engineering stress-strain diagram is equal to ___.
 Definition
zero
Term
The area under the stress-strain curve to fracture a material is equal to the ___.
 Definition
toughness
Term
The increase in specimen strength with plastic strain is ___ hardening.
 Definition
strain or work
Term
The ratio of the change in the cross-sectional area at the location of fracture to the original cross-sectional area is equal to the ___.
 Definition
ductility
Term
The logarithm of the ratio of initial cross-sectional area to the area at the location of fracture of a specimen is equal to the ___ to fracture.
 Definition
true strain
Term
Thermosetting polymers are more brittle than thermoplastic polymers, because LCMs are ____.
 Definition
cross-linked
Term
For the low-carbon steel in Figure 6.16, at what strain would a neck start to form in the specimen?
 Definition
0.15
Term
The tensile yield stress in ductile metals and polymers is approximately ___ of the compressive yield strength.
 Definition
100%
Term
In crystalline metals and ceramics, elastic strain is due to the stretching or compression of _____ bonds resulting from changes in the lattice parameter.
 Definition
interatomic or chemical or atomic
Term
The ___ strength of a brittle or composite material is the maximum tensile stress determined from a three-point bend test.
 Definition
flexural
Term
Hardness is a measure of the resistance of a material to ___ by an indenter.
 Definition
penetration
Term
During loading in a stress-strain test of a material, we observe that the plot is not linear and has no discontinuities. We can assume that:
 Definition
We CANNOT assume the material is nonlinear elastic, anelastic, or there is elastic and plastic strain.
Term
Which of the following materials would you expect to have the lowest Young's modulus?
 Definition
Rubber
Term
At the yield stress in a metal,
 Definition
the plastic strain is equal to .002.
Term
Which of the following pure annealed materials would you expect to have the highest yield stress?
 Definition
HCP magnesium
Term
Which of the following materials would you expect to be isotropic?
 Definition
a casting of aluminum
Term
One reason that dislocation motion is difficult in covalently bonded materials such as diamond is that:
 Definition
Covalent bonds resist changes in angle.
Term
Plastic strain in silica glass at a temperature just above the glass transition temperature is due to:
 Definition
The breaking and reforming of silicon-oxygen bonds with different neighbors.
Term
What is the weight percent carbon in a 1040 steel?
 Definition
0.40%
Term
Which of the following would not contribute to a high modulus of resilience?
 Definition
a high ductility
Term
At the ultimate tensile strength,
 Definition
the maximum load-carrying capacity is experienced.
Term
The toughness of a material is:
 Definition
the strain energy per unit volume needed to fracture the material.
Term
The ratio of the tensile fracture strength of ceramics to the compressive fracture strength is typically:
 Definition
0.1 to 0.2
Term
Which of the following tests would probably not be successful for a brittle ceramic material?
 Definition
Tensile test with a standard tensile-test specimen, as shown in Figure 6.15a.
Term
If TiNi is deformed 5% at a temperature above the martensite start temperature, and then the strain is fully recovered upon reduction of the stress to 0, this material is ___.
 Definition
super or pseudo-elastic
Term
If TiNi is deformed %5 at a temperature below the martensite finish temperature, and then the force is reduced to 0, how would you expect the material to respond?
 Definition
with a small elastic strain and a large plastic strain.
Term
In the Brinell hardness test, the indenter is steel or tungsten, and the shape is a:
 Definition
sphere with a 10mm diameter
Supporting users have an ad free experience!