Choose all primary material selection issues
formula for density
The yield strength is where material starts to plastically deform
Formula for modulus of elasticity
Definition of modulus of elasticity
where material property begins to plastically deform
maximum stress a material can withstand
slope of the elastic region of the stress/strain curve
where the material fractures
Stress depends on the type of material being tested
Definition of Ultimate Tensile Strength (UTS)
Slope of the elastic region of a stress strain curve
stress where a material fails
where material starts to plastically deform
Resistance to plastic deformation or scratching or bending is...
fatigue endurance limit
the hardness of metals is tested with which test
brinell or rockewell
the harness of polymers is tested with
Fatigue endurance limit does not apply to non-ferrous metals
For a material to be tough it needs to be what two things
which material has the highest modulus and density
Aluminum has a modulus and density that is the value of steel (ratio)
the equation for stress (in variable form) is
Pure shear stress is generally 1/2 of what?
torsional shear stress
Equation for flexural normal stress
In the equation Mc/I, what does the c stand for?
moment of inertia
distance from the neutral axis to the extreme fiber
polar moment of inertia
Deflection is dependent on material type
What is the equation for deflection?
What is the equation for Factor of safety
stress allowable/stress actual
stress actual/stress allowable
In the factor of safety equation, which stress value is higher?
What material can not be heat treated, only cold worked?
Cyclic loading can cause a material to fail at stress values higher than the yield stress
What material does not have an endurance limit
A material is not likely to fail between the line and the yield stress line