Interlaminar fracture and crack-healing capability of carbon fiber/epoxy composites toughened with 3D-printed poly-?-caprolactone grid structures
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Tarih
2022
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Wiley
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
In this study, carbon fiber (CF)/epoxy (EP) composites are toughened with 3D-printed poly-epsilon-caprolactone (PCL) grid structures which are produced by fused deposition modeling at three different areal weight densities and place between dry plain-weave carbon fabrics prior to resin infusion. Three-point bending, Mode-I fracture toughness, interlaminar shear strength (ILSS), and Charpy impact tests are carried out on the prepared composite specimens. The results show that the PCL interlayers can enhance Mode-I fracture toughness up to seven times (693%). The main toughening mechanism is the crack bridging due to the formation of PCL fibrils. It is shown that there is a quadratic relationship between the amount of PCL and Mode-I fracture toughness improvement. The thermal healing efficiencies (eta) for the first and second healing of PCL reinforced composites are determined as 44.1% and 28.2%, respectively. DMA results indicates that the tan delta values are increased almost 10 times with the addition of PCL interlayers. The flexural properties are decreased due to the reduced fiber volume fraction, higher void content, and plasticization effect of PCL interlayers.
Açıklama
Anahtar Kelimeler
blends, composites, mechanical properties, surfaces and interfaces, thermoplastics
Kaynak
Journal of Applied Polymer Science
WoS Q Değeri
Q2
Scopus Q Değeri
Q2
Cilt
139
Sayı
17
