Dynamic impact and fracture behaviour of carbon fiber reinforced 7075 aluminum metal matrix composite

Woei-Shyan Lee, Wu Chung Sue

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

The aim of this work is to study the effect of strain rate and fiber volume fraction on the dynamic impact of response and fracture of carbon fiber reinforced 7075 Al metal matrix composite under room temperature. Cylindrical specimens containing 5-15 Vf% carbon fiber were deformed at strain rates ranging from 10-1 s-1 to 3.5 × 103 s-1 by means of a Saginomiya 100 metal forming machine and a compressive split-Hopkinson bar. Fracture phenomena and variation of microstructure were investigated using optical and scanning electron microscopy. The resulting data indicate that impact response of the tested composite is affected both by applied strain rate and fiber volume fraction, resulting in variations of work hardening rate, strain rate sensitivity and activation volume. The deformed microstructure at both low and high strain rate displayed extensive unstable plastic flow of Al matrix associated with catastrophic fiber fragmentation. Fiber breakage is dominated mostly by shearing and tension, and relatively shorter fiber fragment length is found at high rate conditions. Fracture behaviour and the damage process of the tested composite depend quite strongly on the strain rate.

Original languageEnglish
Pages (from-to)1821-1841
Number of pages21
JournalJournal of Composite Materials
Volume34
Issue number21
DOIs
Publication statusPublished - 2000 Jan 1

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Aluminum
Carbon fibers
Strain rate
Metals
Composite materials
Fibers
Metal forming machines
Volume fraction
Microstructure
Plastic flow
Shearing
Strain hardening
carbon fiber
Chemical activation
Scanning electron microscopy
Temperature

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Mechanics of Materials
  • Mechanical Engineering
  • Materials Chemistry

Cite this

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Dynamic impact and fracture behaviour of carbon fiber reinforced 7075 aluminum metal matrix composite. / Lee, Woei-Shyan; Sue, Wu Chung.

In: Journal of Composite Materials, Vol. 34, No. 21, 01.01.2000, p. 1821-1841.

Research output: Contribution to journalArticle

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AB - The aim of this work is to study the effect of strain rate and fiber volume fraction on the dynamic impact of response and fracture of carbon fiber reinforced 7075 Al metal matrix composite under room temperature. Cylindrical specimens containing 5-15 Vf% carbon fiber were deformed at strain rates ranging from 10-1 s-1 to 3.5 × 103 s-1 by means of a Saginomiya 100 metal forming machine and a compressive split-Hopkinson bar. Fracture phenomena and variation of microstructure were investigated using optical and scanning electron microscopy. The resulting data indicate that impact response of the tested composite is affected both by applied strain rate and fiber volume fraction, resulting in variations of work hardening rate, strain rate sensitivity and activation volume. The deformed microstructure at both low and high strain rate displayed extensive unstable plastic flow of Al matrix associated with catastrophic fiber fragmentation. Fiber breakage is dominated mostly by shearing and tension, and relatively shorter fiber fragment length is found at high rate conditions. Fracture behaviour and the damage process of the tested composite depend quite strongly on the strain rate.

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