Term
The tensile force divided by the original crosssectional area of a specimen is the engineering normal ____. 

Definition


Term
The change in length resulting from an applied force on a specimen divided by the original length is the engineering ___. 

Definition


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


Term
The tensile force divided by the actual crosssectional area of a specimen is the ___ stress. 

Definition


Term
If an applied stress is equal in three perpendicular directions, the stress is ___. 

Definition


Term
A(n) ___ material has properties that are equal in three perpendicular directions. 

Definition


Term
In a tensile specimen with uniform strain, the true strain is equal to the natural log of 1 plus the ___. 

Definition


Term
Recovered strain is ___ strain. 

Definition


Term
Permanent strain is ___ strain. 

Definition


Term
In an isotropic material subject to a hydrostatic stress, the volumetric strain is equal to ___ times the strain in the x direction. 

Definition


Term
A shear strain causes changes in ___ in a specimen. 

Definition


Term
The linear relationship between stress and elastic strain is known as _____. 

Definition


Term
_____ is equal to the ratio of the applied stress to the elastic strain. 

Definition


Term
In a nonlinear elastic material, the ratio of the applied stress to the total strain is the _____. 

Definition


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


Term
The ratio of the hydrostatic stress to the elastic volumetric strain is equal to the ____. 

Definition


Term
A material that requires time to fully recover after the stress is reduced to 0 is ____. 

Definition


Term
In crystalline metals, plastic strain at low temperature is due to ____ motion. 

Definition


Term
In glass, plastic strain is due to the ____ and reformation of atomic bonds. 

Definition


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


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


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


Term
The tensile stress where plastic strain begins is equal to the ____ limit. 

Definition


Term
The tensile stress where plastic strain is equal to .002 is equal to the ___ stress. 

Definition


Term
The modulus of ___ is the maximum strain energy that a material can absorb and then fully return when unloaded. 

Definition


Term
At the ultimate tensile strength, the slope of the engineering stressstrain diagram is equal to ___. 

Definition


Term
The area under the stressstrain curve to fracture a material is equal to the ___. 

Definition


Term
The increase in specimen strength with plastic strain is ___ hardening. 

Definition


Term
The ratio of the change in the crosssectional area at the location of fracture to the original crosssectional area is equal to the ___. 

Definition


Term
The logarithm of the ratio of initial crosssectional area to the area at the location of fracture of a specimen is equal to the ___ to fracture. 

Definition


Term
Thermosetting polymers are more brittle than thermoplastic polymers, because LCMs are ____. 

Definition


Term
For the lowcarbon steel in Figure 6.16, at what strain would a neck start to form in the specimen? 

Definition


Term
The tensile yield stress in ductile metals and polymers is approximately ___ of the compressive yield strength. 

Definition


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 threepoint bend test. 

Definition


Term
Hardness is a measure of the resistance of a material to ___ by an indenter. 

Definition


Term
During loading in a stressstrain 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


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


Term
Which of the following materials would you expect to be isotropic? 

Definition


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 siliconoxygen bonds with different neighbors. 


Term
What is the weight percent carbon in a 1040 steel? 

Definition


Term
Which of the following would not contribute to a high modulus of resilience? 

Definition


Term
At the ultimate tensile strength, 

Definition
the maximum loadcarrying 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


Term
Which of the following tests would probably not be successful for a brittle ceramic material? 

Definition
Tensile test with a standard tensiletest 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


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 

