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mixed-mode I/III fracture toughness of polymer matrix composites
toughened with waste particles |
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Fracture toughness of particle-filled
polymer composite beams with different particle content for
varying of crack inclination angles was investigated in mode I
and mode III loading conditions. The beams were tested using
three-point bending test with crack inclination angles of 30°,
45°, 75°, and 90°. Sewage sludge ash (SSA), fly ash (FA), and
silicon carbide (SiC) microparticles were used as toughening
fillers with 5, 10, 15, and 20 wt% contents of the total weight
of the polymer composites. The scanning electron microscope
(SEM) micrographs showed that a good indication was observed for
dispersion of FA, SSA, and SiC particles within the polymer
matrix. The critical crack tip stress intensity factors KIc
(crack angle 90°) and KIIIc, and the critical strain energy
release rates GIc and GIIIc were calculated and their results
were compared. The mode I and mode III fracture toughness of the
particulate polyester composite were improved by addition of
particulate fillers. The maximum values of fracture toughness
mode I (KIc and GIc) and mode III (KIIIc and GIIIc) were
recorded at particle content of 5 wt% polymer composites. |
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