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Flashcards in Testing and quality assurance Deck (13):
1

mechanical properties

force
deformation
time
electronic measurement
graphical and calculated results
measurements are repeatable

2

Instron: tensile testing

a small sample is controlled gradually increasing uniaxial tension until failure
samples = film and fiber
tear apart from one another

3

Instron: compressive testing

compressive strength = capacity of a material to withstand axially directed pushing forces

4

texture test

stress relaxation
creep recovery experiment

5

stress relaxation experiment

strain is applied to sample instantly and held constant with time
stress monitored as a function of time
stress decrease with time starting high and finishing at 0
square graph

6

creep recovery experiment

stress is applied to sample instantly and held constant for a certain time then stress reduced to 0 and the strain is monitored as a function of time
curve graph

7

factors influencing gas transmission

Temperature
relative humidity
thickness
level of plasticizer
microperforation
creases

8

thermal analysis

to measure heat flow, weight loss, dimensional change, mechanical properties as function of temperature
TGA and DMA

9

thermogravimetric analysis TGA

mass of sample measured over time as the T changes

10

Dynamic mechanical analysis DMA

mechanically deform a sample and measure sample response as a function of temperature or time

11

storage modulus E'

elastic component related to samples stiffness

12

loss modulus E"

viscous component related to the sample's ability to dissipate mechanical energy through molecular motion

13

tangent of phase difference

relationship between the elastic and inelastic components