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Discrete Spring Model for Predicting Delamination Growth in Z-Fiber Reinforced DCB SpecimensBeam theory analysis was applied to predict delamination growth in Double Cantilever Beam (DCB) specimens reinforced in the thickness direction with pultruded pins, known as Z-fibers. The specimen arms were modeled as cantilever beams supported by discrete springs, which were included to represent the pins. A bi-linear, irreversible damage law was used to represent Z-fiber damage, the parameters of which were obtained from previous experiments. Closed-form solutions were developed for specimen compliance and displacements corresponding to Z-fiber row locations. A solution strategy was formulated to predict delamination growth, in which the parent laminate mode I critical strain energy release rate was used as the criterion for delamination growth. The solution procedure was coded into FORTRAN 90, giving a dedicated software tool for performing the delamination prediction. Comparison of analysis results with previous analysis and experiment showed good agreement, yielding an initial verification for the analytical procedure.
Document ID
20040170448
Acquisition Source
Langley Research Center
Document Type
Preprint (Draft being sent to journal)
Authors
Ratcliffe, James G.
(National Academy of Sciences - National Research Council Hampton, VA, United States)
OBrien, T. Kevin
(Army Research Lab. Hampton, VA, United States)
Date Acquired
September 7, 2013
Publication Date
January 1, 2004
Subject Category
Composite Materials
Meeting Information
Meeting: ASC/ASTM-D30 Joint 19th Annual Technical Conference
Location: Atlanta, GA
Country: United States
Start Date: October 17, 2004
End Date: October 20, 2004
Sponsors: American Society for Testing and Materials, American Society for Composites
Funding Number(s)
OTHER: 23-762-55-LC
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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