Assessment of the Fracture Behavior of an Asymmetrically Loaded Cantilever Composite Structure

[+] Author and Article Information
Baoxiang Shan, Assimina A. Pelegri

Rutgers, The State University of New Jersey, Department of Mechanical and Aerospace Engineering, 98 Brett Road, Piscataway, NJ 08854-8058 USA

J. Eng. Mater. Technol 125(4), 353-360 (Sep 22, 2003) (8 pages) doi:10.1115/1.1605108 History: Received January 21, 2003; Revised June 17, 2003; Online September 22, 2003
Copyright © 2003 by ASME
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Geometry of the delaminated cantilever
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Singular elements at concentrated point
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Situation around the end of delamination: (a) penetration of the delamination flanks without contact analysis; and (b) contact of the delamination flanks with contact analysis.
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Relation of load and displacement: Line 1—model for h/T=6/24, without contact zone; Line 2—model for h/T=6/24, with contact zone; Line 3—model for h/T=3/24, without contact zone; Line 4—model for h/T=3/24, with contact zone; and Line 5—model without delamination.
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Distribution of contact force along the delamination: P—applied load; Delamination length here is 50 mm.
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Procedure of solution to simple geometric model
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Variation of energy release rate with applied loading: solid line—ratio of energy release rate with contact zone to that without contact zone; dash line—energy release rate with contact zone.
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Applied load, P, versus displacement, δ, at the free end of cantilever beam: solid line—geometric model; dashed line—finite element analysis; and circle—experimental data.
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Ratio of stress intensity factors in mode II to mode I: (a) inner end for h/T=3/24 with contact zone; (b) outer end for h/T=3/24 with contact zone; (c) inner end for h/T=3/24 without contact zone; (d) outer end for h/T=3/24 without contact zone; (e) inner end for h/T=6/24 with contact zone; (f) outer end for h/T=6/24 with contact zone; (g) inner end for h/T=6/24 without contact zone; and (h) outer end for h/T=6/24 without contact zone.
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The variation of stress intensity factor in mode I with loading: (a) mode I, KI; and (b) mode II, KII.
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Trajectory of crack propagation in IM7/8552 graphite/epoxy. Kinking from the 6th /7th to the 5th /6th interface is observed.
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Trajectory of crack propagation in mode I




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