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Authors
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Pisanova, E. ; Zhandarov, S. ; Mäder, E. ; Young, R. J. ; Ahmad, I.
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Title
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Three techniques of interfacial bond strength estimation from direct observation of crack initiation and propagation in polymer-fibre systems
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Date
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28.11.2001
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Number
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8764
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Abstract
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Three techniques of bond strength determination in micromechanical tests—fibre strain profile analysis by means of Raman spectroscopy, "kink" force determination in a traditional pull-out test, and crack length monitoring in a microbond test—were used for investigation of interfacial debonding in epoxy–glass fibre and epoxy–aramid fibre systems. Crack propagation was characterised by local interfacial parameters—critical energy release rate,<i>G</i><sub>ic</sub>, and ultimate interfacial shear strength (IFSS), <i>τ</i><sub>ult</sub>. The comparison of the results showed good agreement both between different techniques and between stress-based and energy-based failure criteria. Sizing of glass fibres caused more pronounced variations in the IFSS than for aramid fibres due to different interfacial failure patterns. The strength of "real" epoxy–glass composites with sized and unsized fibres correlates well <br />with the bond strength determined from the micromechanical tests.
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Publisher
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Composites / Part A
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Wikidata
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Citation
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Composites / Part A 32 (2001) 435-443
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DOI
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https://doi.org/10.1016/S1359-835X(00)00054-3
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