SAMPE Journal - May/June 2020 - 13
and an aluminum insert which was 25.4 mm thick
at the core and tapered to 15.2 mm at the free end
was inserted at either end of the panel and attached
to the face sheet with adhesive. The test specimens
were designed to fail at the joint location.
LONGITUDINAL JOINT SUB-ELEMENT
TESTING & ANALYSIS CORRELATION
In order to assess the structural performance of
the CTE longitudinal composite sandwich bonded
joint design and to validate the structural models
for joint failure prediction, the CTE team devised
an extensive test matrix determined by the structural analysis effort for various critical loading conditions based on the longitudinal joint. These loading conditions included axial compression, hoop
compression, and hoop tension applied loadings.
Multiple replicates of sub-element jointed test coupons were machined from the composite sandwich
bonded jointed panels and tested for failure both
in pristine conditions and damage conditions with
impact-damage at the center of the joint at Southern Research in Birmingham, AL. The next sections
include a summary of the pristine test results for
the AEWC, HEWC, and HEWT joint sub-element
specimen testing conducted at SR from May-July
Figure 4. HEWT coupon size and geometry (with aluminum inserts).
2018. Progressive failure analyses (PFA) and cohesive zone modeling (CZM) were used to predict the
joint failure load and location for each joint coupon test. A description of the PFA used to predict
the failure of the sub-element specimen testing
is presented. Lastly, correlation with pre-test and
post-test analysis predictions with the test results
are discussed.
Progressive Failure Analysis Methodology
The progressive failure analysis procedure adopted in this work to evaluate strength and failure
mode of longitudinal joint coupons consists of
three steps. The first step in failure analysis is to
determine damage at the material point. This was
accomplished by adopting Hashin-Rotem failure
criteria.
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SAMPE Journal - May/June 2020
Table of Contents for the Digital Edition of SAMPE Journal - May/June 2020
Table of Contents
SAMPE Journal - May/June 2020 - Cover1
SAMPE Journal - May/June 2020 - Cover2
SAMPE Journal - May/June 2020 - Table of Contents
SAMPE Journal - May/June 2020 - 2
SAMPE Journal - May/June 2020 - 3
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SAMPE Journal - May/June 2020 - 5
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SAMPE Journal - May/June 2020 - Cover3
SAMPE Journal - May/June 2020 - Cover4
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