Mat Sci Exam 2

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Internal moment and forces represent the ___________ of the force and moment distributions on the plane
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Terms in this set (20)
Internal moment and forces represent the ___________ of the force and moment distributions on the plane
resultant
This is defined as the change in length of a line per unit length
strain
In the elastic region, the stress strain relationship for most engineering materials is __________
linear
Poisson's ration is best described as
the negative ratio of the lateral strain to the longitudinal strain
How will the behavior of a material with a low modulus of elasticity differ from the behavior of a material with a high modulus of elasticity?
it will exhibit greater strain at the same level of loading
and
it will require a lower stress level to achieve the same amount of strain
The presence of dislocations causes what kind of fields to develop in a material?
strain
The combination of slip plane and slip direction is known as what?
slip system
Which is a guiding principle in strengthening materials?
restricting or hindering dislocation motion renders a material harder and stronger
Metals of a high purity are almost always ____________ than alloyed materials
weaker
Which technique can be used to strengthen a material?
increase the amount of cold working done on the material
Which is a mechanism of ductile fracture?initial necking, formation of cavities, and crack formsThis parameter relates the critical stress for crack propagation to the crack lengthfracture toughnessSome materials will change from ductile to brittle behavior at low temperatures. This phenomenon is known as what?ductile-brittle transitionWhich describes ductile fracture?exhibits extensive deformation around a crackWhich affects the fatigue life of a material?mean stress, inclusion of notches or discontinuities, and polishingIn this type of system two components completely dissolve into one anotherbinary isomorphousGenerally speaking, which are kinds of information available in a phase diagram?phases present, composition of phases, and percentages/fractions of phasesThis is the point at a specific composition and temperature where the liquid transforms into two solid phases upon coolingeutectic pointWhich is the microstructural product of an iron-carbon alloy of eutectoid composition consisting of alternating layers of ferrite and cementite?pearliteBased on the analysis of the iron/iron-carbide phase diagram, which best describes steels?0.008 to 2.14 wt% C