SAMPE Journal - September/October 2020 - 11
Therefore, it is beneficial to use an interlocking
fiber configuration in which the 90° layers fail
progressively to improve energy absorption.
(a)
(b)
(c)
Figure 8. Fracture surfaces of DCB specimens with various
arrester configurations: (a) 02-902, (b) 03-902, and (c) 02-901
specimens.
Figure 9. Comparison of apparent mode-I fracture toughness
of DCB specimens with various arrester configurations.
Figure 10. Comparison of energy absorptions of DCB specimens with various arrester configurations.
Table 1. Material properties used in this study25, 26.
Elastic moduli [GPa]
Poisson's ratio
w w w. s a m p e . o r g
E11
T700SC/2592
FM300-2M
135
2.4
E22
8.5
G12
4.8
G23
2.7
n12
0.34
n23
0.49
FINITE ELEMENT ANALYSIS
FEA Model
To understand the stress state of the arrester
during the DCB tests, FEA was performed using
a commercial software, Abaqus 2017 (Dassault
Systems Inc.). The FEA model is shown in Figure
11. The stacking sequence of the adherends was
[0]16 (thickness: 2.24 mm). The part dimensions
were 200 mm length and 10 mm width, and
symmetric boundary conditions were imposed in
the width direction. The arrester was introduced
at 110 mm from the tip of the model, and the 02902 and 02-901 specimens were modeled. Based on
the detailed observation using X-ray computed
tomography and the microscope (Figure 12), the
models were partitioned into parts, and the crack
along the interface of the 0° layers and the peeling
of the 90° layers were modeled as seam cracks
(Figure 13)24. A displacement of 35 mm in the
z-direction was applied at 30 mm from the tip of
the model. The cracks were 87 and 96 mm long for
the 02-902 and 02-901 specimens, respectively, from
the loading place. Some adhesive regions were
removed from the model to suppress the distortion
of meshes. Because the stiffness of the adhesive
was significantly lower than that of the adherends
and the arrester, this removal had little effect
on the stress state of the arrester. The material
property values used are summarized in Table 125,
26
. An analysis with geometric nonlinearity was
performed to simulate large deformation in the
DCB tests.
0.38
S E P T E M B E R /O C TO B E R 2 0 2 0
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SAMPE JOURNAL
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11
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SAMPE Journal - September/October 2020
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