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Mixed Mode I/II interlaminar fracture toughness of carbon Fiber/RTM‐6 laminates manufactured by VARTM
Author(s) -
Mendonça Sales Rita de Cássia,
Guimarães Fernando,
Gouvêa Ricardo Francisco,
Cândido Geraldo Maurício,
Donadon Maurício Vicente
Publication year - 2019
Publication title -
polymer composites
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.577
H-Index - 82
eISSN - 1548-0569
pISSN - 0272-8397
DOI - 10.1002/pc.24810
Subject(s) - materials science , composite material , ductility (earth science) , fracture toughness , fracture (geology) , brittleness , transfer molding , fiber , fracture mechanics , mold , creep
This work investigates and compares the interlaminar fracture behavior of composites manufactured by vacuum‐assisted resin transfer molding subjected to three different temperatures (–54, 25, and 80°C) and mode ratios (25, 50, and 75%). The results indicate ductility enhancement with increasing temperature, which were confirmed by fractographic analyses. In tested specimens with 25% mode ratio, the G I and G II values were not greatly affected by the temperature. As the temperature and the mode ratio increases, the specimens exhibited higher G I and G II values compared with those measured at −54°C. In the tested specimens with 75% mode ratio, an unstable crack propagation was observed at −54°C due to brittle behavior of matrix, which is promoted by the decrease of the adhesion represented by cusps and broken fibers in SEM images. The cusps formation is less pronounced for specimens tested at 80°C and the fracture surface is flatter compared with those tested at −54 and 25°C. POLYM. COMPOS., 40:E1029–E1040, 2019. © 2018 Society of Plastics Engineers