Carbons, Composites, and Natural Materials
Material that has the same physical properties, such as strength and thermal conductivity, in all directions
What is an isotropic material?
Most common cause of failure in metals resulting from
cyclical application
of stress below the ultimate stress
What is fatigue?
Breakdown of ceramics
What is degradation??
This term is defined as the "void fraction of a material".
What is porosity?
Smaller sub-unit that makes up a polymer
what is a monomer
Primary clinical application of carbon
What are mechanical heart valves?
Time dependent
plastic straining under
load
What is creep?
number of nearest
neighbors with opposite charge
What is coordination number?
Salt leaching, gas foaming, and freeze-drying are common methods used for...?
How are pores formed in a material?
*Include image of block copolymer*
What kind of copolymer is this?
What is a block copolymers
Naturally occurring polyer dervived from brown algae
What is Chitosan?
* include image of substitution impurity *
What type of point defect is this?
What is a substitution impurity
200 - (Pore volume (Vp)/Total volume (Vt))*100
how to solve for porosity
200 - *iniclude image of surface erosion
more hydrolysis is occurring compared water going into the material
what is surface erosion/
relationship that states a material's yield strength increases as its average grain size decreases
what is the petch-hall effect
this occurs when a material lacks pores so the body forms a barrier around the implant.
what is fibrous encapsulation?