Single-Fiber Fragmentations of AS-4 Carbon Fiber Embedded in Epon 828 Under the Effect of Elevated Temperatures

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Volume 23, Issue 1 (January 2001)

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ISSN: 0884-6804
Page Count: 6

Single-Fiber Fragmentations of AS-4 Carbon Fiber Embedded in Epon 828 Under the Effect of Elevated Temperatures
Walther, MB
Composite material analyst, Composites Process Development Center, MZ

Reifsnider, KL
Alexander Giacco Professor, 120 Patton Hall, ESM, MC 0219, VPI&SU, VA

Madhukar, M
Associate professor, University of Tennessee, TN

Genidy, MS
Graduate assistant, University of Tennessee, TN

(Received 2 August 1999; accepted 24 July 2000)

Abstract

Single fiber fragmentation tests were performed over a range of elevated temperatures (ambient to 160°C) to study the effect of temperature on the fiber-matrix interface. In order to understand the mechanical performance of a polymer/carbon fiber composite system, the micromechanical performance must be understood. The mechanical performance of a composite material is dependent on the fiber-matrix interface region. The nature of the fiber-matrix interface controls the interfacial shear strength and this is an important parameter in the formulation of shear-lag and other micromechanical models. Micromechanical shear-lag models are used to estimate macromechanical properties of composite materials. Environmental conditions that affect the macromechanical properties of polymer composites need to be understood at the micromechanical level. Temperature is one example of an environmental condition that influences the mechanical response of some composite systems. The study presented in this paper uses the measurement of broken fiber lengths resulting from the multiple fracture of a single fiber that is embedded in resin with applied load. The material system used in this study was an AS4-carbon-fiber/Epon-828/mPDA-epoxy-resin-system. The critical fragmentation lengths were measured with the aid of a microscope, and the critical lengths were found to increase 70% from ambient temperature to 160°C.

Keywords:
fiber/matrix interface, critical fragmentation length, temperature, interfacial shear strength, elasticity model, thermodynamic model

Paper ID: CTR10911J
DOI: 10.1520/CTR10911J
ASTM International is a member of CrossRef.

Author Title Single-Fiber Fragmentations of AS-4 Carbon Fiber Embedded in Epon 828 Under the Effect of Elevated Temperatures Symposium , 0000-00-00 Committee D30

		Home Journals STPs Manuals Topics Subscriptions/Pricing Digital Library / Journal of Composites Technology and Research (JCTR) / Citation Page Volume 23, Issue 1 (January 2001) Click here to download this paper now for $25 PDF (192K) View License Agreement ISSN: 0884-6804 Page Count: 6 Single-Fiber Fragmentations of AS-4 Carbon Fiber Embedded in Epon 828 Under the Effect of Elevated Temperatures Walther, MB Composite material analyst, Composites Process Development Center, MZ Reifsnider, KL Alexander Giacco Professor, 120 Patton Hall, ESM, MC 0219, VPI&SU, VA Madhukar, M Associate professor, University of Tennessee, TN Genidy, MS Graduate assistant, University of Tennessee, TN (Received 2 August 1999; accepted 24 July 2000) Abstract Single fiber fragmentation tests were performed over a range of elevated temperatures (ambient to 160°C) to study the effect of temperature on the fiber-matrix interface. In order to understand the mechanical performance of a polymer/carbon fiber composite system, the micromechanical performance must be understood. The mechanical performance of a composite material is dependent on the fiber-matrix interface region. The nature of the fiber-matrix interface controls the interfacial shear strength and this is an important parameter in the formulation of shear-lag and other micromechanical models. Micromechanical shear-lag models are used to estimate macromechanical properties of composite materials. Environmental conditions that affect the macromechanical properties of polymer composites need to be understood at the micromechanical level. Temperature is one example of an environmental condition that influences the mechanical response of some composite systems. The study presented in this paper uses the measurement of broken fiber lengths resulting from the multiple fracture of a single fiber that is embedded in resin with applied load. The material system used in this study was an AS4-carbon-fiber/Epon-828/mPDA-epoxy-resin-system. The critical fragmentation lengths were measured with the aid of a microscope, and the critical lengths were found to increase 70% from ambient temperature to 160°C. Keywords: fiber/matrix interface, critical fragmentation length, temperature, interfacial shear strength, elasticity model, thermodynamic model Paper ID: CTR10911J DOI: 10.1520/CTR10911J ASTM International is a member of CrossRef. Author Title Single-Fiber Fragmentations of AS-4 Carbon Fiber Embedded in Epon 828 Under the Effect of Elevated Temperatures Symposium , 0000-00-00 Committee D30