MSE 250 EXAM 2 QUESTIONS & ANSWERS
For a particular crystal structure, the slip direction is that direction in the slip plane
having the... - Answer -Highest linear density
Poisson's ratio - Answer -The negative ratio of transverse and longitudinal strain.
v=-Ex/Ez=-Ey/Ez
Strain equation - Answer -Change in measurement / Original measurement.
Stress equation - Answer -Force/original area
True strain - Answer -Ln(length / initial length)
True stress - Answer -=K*(True strain)^n
n is strain hardening exponent
The angle between the stress axes and the slip plane - Answer -¥
[] and ()
The angle between stress axis and slip direction - Answer -Ø
[] and []
Resolved shear stress? - Answer -Stress*cos(ø)* cos(¥)
Hooke's Law - Answer -Stress=elastic modulus* longitudinal strain
For a cylinder, measurements used to find strain: longitudinal is ... And transverse is ....
- Answer -Length and Diameter
Stress concentration - Answer -It is a place (usually a defect location) in the sample
microstructure where the stress is locally higher than the global applied stress
What can strengthen a material? - Answer -Alloying, cold work and grain size reduction
(T/F) The phenomenon of yielding occurs at the onset of necking - Answer -False.
Yielding is the onset of plastic deformation.
(T/F) For uniaxial tensile deformation of a common metal, the value of true stress is
always greater than or equal to engineering stress at any given displacement. - Answer
-True. True stress is always larger than engineering stress.
(T/F) Brittle materials tend to fracture in a "cup and cone" fashion. - Answer -False. Cup
and cone fracture surface is a typical patter for ductile failure.
For a particular crystal structure, the slip direction is that direction in the slip plane
having the... - Answer -Highest linear density
Poisson's ratio - Answer -The negative ratio of transverse and longitudinal strain.
v=-Ex/Ez=-Ey/Ez
Strain equation - Answer -Change in measurement / Original measurement.
Stress equation - Answer -Force/original area
True strain - Answer -Ln(length / initial length)
True stress - Answer -=K*(True strain)^n
n is strain hardening exponent
The angle between the stress axes and the slip plane - Answer -¥
[] and ()
The angle between stress axis and slip direction - Answer -Ø
[] and []
Resolved shear stress? - Answer -Stress*cos(ø)* cos(¥)
Hooke's Law - Answer -Stress=elastic modulus* longitudinal strain
For a cylinder, measurements used to find strain: longitudinal is ... And transverse is ....
- Answer -Length and Diameter
Stress concentration - Answer -It is a place (usually a defect location) in the sample
microstructure where the stress is locally higher than the global applied stress
What can strengthen a material? - Answer -Alloying, cold work and grain size reduction
(T/F) The phenomenon of yielding occurs at the onset of necking - Answer -False.
Yielding is the onset of plastic deformation.
(T/F) For uniaxial tensile deformation of a common metal, the value of true stress is
always greater than or equal to engineering stress at any given displacement. - Answer
-True. True stress is always larger than engineering stress.
(T/F) Brittle materials tend to fracture in a "cup and cone" fashion. - Answer -False. Cup
and cone fracture surface is a typical patter for ductile failure.
