SAMPE Journal - November/December 2016 - 44
Feature Article
Figure 13. Maximum compressive stress-strain slope results.
Figure 14. Compressive true strain results.
Table 10. Maximum coefficient of variation (CV) of measured properties.
Mark-off
Mark-off were measured through their depth. A total
of 6 readings/material/cure cycle were collected and
averaged. In all samples the caul plates left some visible
coloration (Figure 17) but no permanent indentation.
Color Results
Clear ET materials typically change color during
service with increasing number of heat exposures,
turning gradually from milky translucent to yellowish
first to pale orange-bronze later. Therefore, it was
investigated whether color change could be exploited to
detect material performance change, employing a viable
color measurement technique resulting in accurate data
measurable in an easy and cost-effective way. Particularly,
the portable handheld spectrophotometer MiniScan EZ
by Hunter Lab (Figure 18) was used. MiniScan EZ uses
a xenon flash lamp to illuminate the sample, and relative
intensities of light reflected from the sample are analyzed
to produce numeric results representative of the sample
color20. The device is "point-press-read" type,
easy to use.
Measurements were taken in L*a*b* color
scale20 recommended by the International
Commission on Illumination, where:
* L* measures lightness and varies from100
for perfect white to zero for black
* a* describes redness when positive, gray
when zero, and greenness when negative.
* b* describes yellowness when positive, gray
when zero, and blueness when negative.
The instrument measured the parameters
dL*, da*, db*, dE*, dEc, where d = (sample
reading) - (standard reading) for dL*, da*, db*,
and dE* is the total color difference equal to
(dL*2 + da*2+ db*2)1/2. The difference between
L*a*b* values in 0-cure strips and L*a*b*
values of 1-, 3-, 6-cure strips was measured.
Figure 15. Plots of initial compressive stressstrain slope and hardness.
44
SAMPE Journal, Volume 52, No. 6, November/December 2016
Table of Contents for the Digital Edition of SAMPE Journal - November/December 2016
Contents
SAMPE Journal - November/December 2016 - Cover1
SAMPE Journal - November/December 2016 - Cover2
SAMPE Journal - November/December 2016 - Contents
SAMPE Journal - November/December 2016 - 2
SAMPE Journal - November/December 2016 - 3
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