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Title: Effect of fiber strength on tensile fracture of unidirectional long carbon fiber-reinforced epoxy matrix composites

Abstract

Carbon fiber-reinforced epoxy matrix composites, with a tensile fracture stress of either 3.5 or 5.5GPa (designated as 3.5 and 5.5GPa CF/RE composites, respectively), were studied to determine the effect of fiber strength on the tensile fracture behavior. The smooth and notched tensile specimens were loaded in the direction parallel to the fibers. The 5.5GPa CF/RE composite exhibited a higher smooth tensile fracture stress but a significantly decreased notch strength ratio compared with the 3.5GPa CF/RE composite. For the smooth tensile specimens of the 3.5GPa CF/RE composite, a zigzag fracture approximately perpendicular to the loading direction occurred, and the fracture process involved a brittle fracture, or pull out, of the fibers; whereas, for the 5.5GPa CF/RE composite, the fracture was approximately parallel to the loading direction, and fiber-matrix interfacial fracture was observed. For the notch tensile tests, fracture occurred at the fiber-matrix interfaces independent of the composite type. The results are described and discussed.

Authors:
;  [1]
  1. Osaka Prefecture Univ., Osaka (Japan). Dept. of Metallurgy and Materials Science
Publication Date:
OSTI Identifier:
511968
Resource Type:
Journal Article
Journal Name:
Materials Characterization
Additional Journal Information:
Journal Volume: 38; Journal Issue: 2; Other Information: PBD: Feb 1997
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; COMPOSITE MATERIALS; FRACTURE PROPERTIES; TENSILE PROPERTIES; EPOXIDES; CARBON FIBERS; MECHANICAL TESTS; USES

Citation Formats

Tomita, Yoshiyuki, and Tempaku, Mitsunori. Effect of fiber strength on tensile fracture of unidirectional long carbon fiber-reinforced epoxy matrix composites. United States: N. p., 1997. Web. doi:10.1016/S1044-5803(97)80028-9.
Tomita, Yoshiyuki, & Tempaku, Mitsunori. Effect of fiber strength on tensile fracture of unidirectional long carbon fiber-reinforced epoxy matrix composites. United States. doi:10.1016/S1044-5803(97)80028-9.
Tomita, Yoshiyuki, and Tempaku, Mitsunori. Sat . "Effect of fiber strength on tensile fracture of unidirectional long carbon fiber-reinforced epoxy matrix composites". United States. doi:10.1016/S1044-5803(97)80028-9.
@article{osti_511968,
title = {Effect of fiber strength on tensile fracture of unidirectional long carbon fiber-reinforced epoxy matrix composites},
author = {Tomita, Yoshiyuki and Tempaku, Mitsunori},
abstractNote = {Carbon fiber-reinforced epoxy matrix composites, with a tensile fracture stress of either 3.5 or 5.5GPa (designated as 3.5 and 5.5GPa CF/RE composites, respectively), were studied to determine the effect of fiber strength on the tensile fracture behavior. The smooth and notched tensile specimens were loaded in the direction parallel to the fibers. The 5.5GPa CF/RE composite exhibited a higher smooth tensile fracture stress but a significantly decreased notch strength ratio compared with the 3.5GPa CF/RE composite. For the smooth tensile specimens of the 3.5GPa CF/RE composite, a zigzag fracture approximately perpendicular to the loading direction occurred, and the fracture process involved a brittle fracture, or pull out, of the fibers; whereas, for the 5.5GPa CF/RE composite, the fracture was approximately parallel to the loading direction, and fiber-matrix interfacial fracture was observed. For the notch tensile tests, fracture occurred at the fiber-matrix interfaces independent of the composite type. The results are described and discussed.},
doi = {10.1016/S1044-5803(97)80028-9},
journal = {Materials Characterization},
number = 2,
volume = 38,
place = {United States},
year = {1997},
month = {2}
}