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090			_aB-17844
245	1	0	_aStrain rate effect in the single-fiber-fragmentation test
490	0		_vPolymer Composites, 22(3), p.349-360, 2001
520	3		_aThe single fiber fragmentation test (SFVU)has been widely used to characterize the interface it fiber?reinforced polymers. The purpose of the work reported here was to determine the effect of strain rate on the fiber fragment lengths obtained in the SFFT. Three materials systems were used to make single?fiber?composite specimens: E?glass fiber/polycarbonate matrix, AS4?carbon fiber/polycarbonate matrix, and AS4?carbon fiber/polycarbonate matrix. The fiber?matrix adhesion in all three systems is based on physisorption rather than chemisorption. Each system was tested at strain rates ranging over four orders of magnitude. Results are reported in terms of fragment length, the dependent variable in this study, which is inversely related to the quality of the Interface. It was expected that the fragment length would show a systematic decrease with Increasing strain rate, but the expected trend was not found. Although the polycarbonate matrix exhibited rate?dependent viscoelastic behavior typical of amorphous polymers below Tg, the fragment length at saturation did not show a statistically significant variation with strain rate for any of the three materials systems. A major contributor to the lack of observed effect was the inherent random variability associated with the SFFT; random variability in average fragment length was equal or greater than the 19 percent effect of rate predicted for ideal elastic systems with no debonding at the interface. In addition, considerable interfacial debonding occurred during the SFFT, not surprising for Interfaces based on physisorption alone. Debonding Interferes with transfer of applied load from matrix to fiber, and would thus interfere with transfer of the effect of rate from matrix to fiber. A tensile Impact test developed previously was also performed on single?fiber composite specimens made from the same three materials systems. The results of the Impact tests differed from those obtained at controlled strain?rates for only two of the materials systems.
650	1	4	_aAMORPHOUS MATERIALS
650	1	4	_aCHEMISORPTION
650	1	4	_aGLASS FIBER REINFORCED PLASTICS
650	1	4	_aPOLYCARBONATES
650	1	4	_aPOLYMERS
650	1	4	_aSTRAIN RATE
650	1	4	_aTENSILE TESTING
650	1	4	_aVISCOELASTICITY
700	1	2	_aGong, X. J.
700	1	2	_aArthur, J. A.
700	1	2	_aPenn, L. S.
856	4	0	_uhttps://drive.google.com/file/d/12EkWKu9FXwrLiXQHfnXIujVpB6q2_z1c/view?usp=drivesdk _zPara ver el documento ingresa a Google con tu cuenta: @cicy.edu.mx
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