SAMPE Journal - May/June 2016 - 50
Feature Article
(a)
Facesheet side
(b) Facesheet side
(c) Core side
(d) Core side
Figure 7. Representative images of fracture surfaces of samples cured under full vacuum at different locations.
Table 3. Edgewise compression test results
Edgewise Compression Test
In the present study, edgewise compression test
was conducted under room temperature and 177°C
(350°F). Results of edgewise compressive test are
shown in Table 3. Similar compressive strengths
were observed in samples cured under full vacuum
and partial vacuum. When test temperature was
raised to 177 °C, the edgewise compression strengths
dropped by 20.8% and 32.2% respectively. This can
be an effect of reduced core stiffness under elevated
temperatures.
A representative load-displacement plot of
edgewise compression test is shown in Figure 9.
The load increases gradually until it reaches a peak
value. Progressive failure initiates at this point. The
exact location of facesheet failure was unknown.
50
Continued loading resulted in stable end crushing of
the sandwich specimen (Figure 10).
Damage initiation in the sandwich composites was
in the form of facesheet failure, because the failure
strain of the core is much higher than that of the
facesheets. The composite facesheets can exhibit
various failure modes such as elastic microbuckling,
plastic microbuckling, fiber crushing, splitting,
buckle delamination and shear band formation. On
continued loading after failure initiation, sandwich
structures can exhibit various failure modes such
as (1) Unstable buckling of the sandwich column;
(2) Facesheet delamination followed by unstable
buckling in opposite directions; and (3) Stable end
crushing of sandwich panels17,18. The unstable failure
modes are seen when the bending strength of the
SAMPE Journal, Volume 52, No. 3, May/June 2016
Table of Contents for the Digital Edition of SAMPE Journal - May/June 2016
Contents
SAMPE Journal - May/June 2016 - Cover1
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