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Title: Mixed-Mode and Mode-II Fatigue Crack Growth in Woven Composites

Journal Article · · Proceedings of the Society for Experimental Mechanics Series
 [1];  [1]
  1. Northwestern Univ., Evanston, IL (United States)
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In this work, a woven carbon/epoxy composite was subjected to fatigue crack growth under mixed Mode-I/Mode-II loading to obtain crack growth behavior at different cyclic strain energies. Owing to the woven structure of the material, pure Mode-II fracture is usually a difficult proposition because of friction, interference, and interlock of woven tows in adjacent plies at an interlaminar crack. These limitations were overcome by the use of a novel form of mixed Mode-I/Mode-II specimen, which imposes sufficient crack surface opening (Mode-I) to alleviate ply-ply interactions, but not so much as to obscure the sliding (Mode-II) response. Finally, comparison with pure Mode-I fatigue crack growth data, in conjunction with a fracture interaction criterion, provided a means to extract the Mode-II behavior.

Research Organization:
Ford Motor Company, Detroit, MI (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V)
Grant/Contract Number:
EE0006867
OSTI ID:
1504729
Journal Information:
Proceedings of the Society for Experimental Mechanics Series, Vol. 8; Related Information: Fracture, Fatigue, Failure and Damage Evolution; ISBN 978-3-319-42194-0; ISSN 2191-5644
Publisher:
Society for Experimental Mechanics - SpringerCopyright Statement
Country of Publication:
United States
Language:
English

References (9)

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On the Analysis and Design of the End Notched Flexure (ENF) Specimen for Mode II Testing journal November 1986
Measurement of mixed-mode delamination fracture toughness of unidirectional glass/epoxy composites with mixed-mode bending apparatus journal January 1996
Mode II Interlaminar Fracture and Damage Evaluation of GFRP Woven Laminates at Cryogenic Temperatures using the 4ENF Specimen journal June 2008
Characterizing Delamination Growth in Graphite-Epoxy
  • Wilkins, D. J.; Eisenmann, J. R.; Camin, R. A.
  • Damage in Composite Materials: Basic Mechanisms, Accumulation, Tolerance, and Characterization https://doi.org/10.1520/STP34326S
book January 1982
Fracture Toughness and Impact Damage Resistance of Nanoreinforced Carbon/Epoxy Composites book July 2014
Hybrid nanoreinforced carbon/epoxy composites for enhanced damage tolerance and fatigue life journal October 2014
Delamination Growth in Composites under Cyclic Loads journal May 1994
Fracture Mechanics for Structural Adhesive Bonds. Part 2 report August 1978

Figures / Tables (15)

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Related Subjects

36 MATERIALS SCIENCE
Composites
Fracture
Fatigue
Mixed-Mode
Test Methods