Lecture 3 Flashcards
hydrophilic compounds are usually mixed w/ a _____ have ____ viscosity, and allow for _____ attachment.
solvent,
low,
composite
what’s contact angle?
measurement of how liquid interacts w/ a surface, low CA = ^ interaction (good wetting), high CA = low interaction (poor wetting)
types of metalic corrosion
galvanic, structure selective, crevice and stress
all metallic corrosion is _____ and requires what?
electrochemical and req. an anode and cathode
how do ceramics and polymers corrode?
hydrolytic degredation
what are hydrolytic degredation products and what are they related to?
Bisphenol-A and Hg, they’re related to toxicity
what happens at the yeild point in a stress strain curve?
slope curves and deformation begins
what is the ultimate strength of a stress strain curve
how much stress a mat can handle, this is where metal and ceramics fail
what’s the initial slope of the stress strain curve?
modulus of elasticity/stiffness of a material
what’s resiliance w/ regards to stress strain curve?
area before pt of deformation under curve
what’s toughness w/ regards to stress strain curve?
area from pt of deformation to point of fracture under curve
what’s the effect of heat on mechanical properties
makes things more ductile
what’s the effect of time on mechanical properties
the faster a stress is applied to a mat, the less deformation will occur, but cracks can occur and H2O can be absorbed
what’s creep?
deformation over time in response to low constant stress
what’s fracture toughness?
a materials sesistance to crack propagation
