TY - JOUR
T1 - Correlation of nanoscale interface debonding and multimode fracture in polymer carbon composites with long-term hygrothermal effects
AU - Yekani Fard, Masoud
AU - Raji, Brian
AU - Pankretz, Heidi
N1 - Funding Information:
This research was supported by supported by ASE Inc. (grant no. FP00004034 ). We acknowledge the use of facilities within the Eyring Materials Center at Arizona State University.
Publisher Copyright:
© 2020 Elsevier Ltd
Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.
PY - 2020/11
Y1 - 2020/11
N2 - The correlation between nanoscale interface debonding and crack energy release rate for modes I, II, and I/II for extended exposure to hygrothermal conditions in polymer matrix composites (PMCs) needs to be understood. In this study, the effects on PMCs for two years of exposure, to a heat of 60 °C and relative humidity of 90%, were investigated. The interphase properties were studied using PF QNM. During hygrothermal treatment, the interphase region's thickness around the crack tip increases, and the morphology of the interphase changes. Nanoscale debonding of the fiber and matrix in artificially aged samples is a mix of cohesive and adhesive failure. Degradation at the nanoscale interphase and the macroscale crack initiation toughness slows after one year of aging. Interface debonding and nanoscale cracks cause intralaminar cracks, fiber bridging, and an increase in crack energy. Toughness in mode I fracture was increased in the artificially aged samples.
AB - The correlation between nanoscale interface debonding and crack energy release rate for modes I, II, and I/II for extended exposure to hygrothermal conditions in polymer matrix composites (PMCs) needs to be understood. In this study, the effects on PMCs for two years of exposure, to a heat of 60 °C and relative humidity of 90%, were investigated. The interphase properties were studied using PF QNM. During hygrothermal treatment, the interphase region's thickness around the crack tip increases, and the morphology of the interphase changes. Nanoscale debonding of the fiber and matrix in artificially aged samples is a mix of cohesive and adhesive failure. Degradation at the nanoscale interphase and the macroscale crack initiation toughness slows after one year of aging. Interface debonding and nanoscale cracks cause intralaminar cracks, fiber bridging, and an increase in crack energy. Toughness in mode I fracture was increased in the artificially aged samples.
KW - Fracture
KW - Interface/interphase
KW - Polymer-matrix composites (PMCs)
KW - Surface analysis
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U2 - 10.1016/j.mechmat.2020.103601
DO - 10.1016/j.mechmat.2020.103601
M3 - Article
AN - SCOPUS:85091577844
SN - 0167-6636
VL - 150
JO - Mechanics of Materials
JF - Mechanics of Materials
M1 - 103601
ER -