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Effects of inter-fiber spacing on fiber-matrix debond crack growth in unidirectional composites under transverse loading
Texas A&M University, USA ; Lulea University of Technology, Sweden ;.
RISE - Research Institutes of Sweden, Swerea, Swerea SICOMP. Lulea University of Technology, Sweden.
Lulea University of Technology, Sweden.
Texas A&M University, USA ; Lulea University of Technology, Sweden.
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2018 (English)In: Composites. Part A, Applied science and manufacturing, ISSN 1359-835X, E-ISSN 1878-5840, Vol. 109, p. 463-471Article in journal (Refereed) Published
Abstract [en]

The energy release rate (ERR) of a fiber–matrix debond crack in a unidirectional composite subjected to transverse tension is studied numerically. The focus of the study is the effect of the proximity of the neighboring fibers on the ERR. For this, a hexagonal pattern of fibers in the composite cross-section is considered. Assuming one fiber to be debonded at certain initial debond arc-length, the effect of the closeness of the surrounding six fibers on the ERR of the crack is studied with the inter-fiber distance as a parameter. Using an embedded cell consisting of discrete fibers in a matrix surrounded by the homogenized composite, a finite element model and the virtual crack closure technique are used to calculate the ERR. Results show that the presence of the local fiber cluster accelerates the crack growth up to a certain initial crack angle, beyond which the opposite effect occurs. It is also found that the residual stress due to thermal cooldown reduces the ERR. However, the thermal cooldown is found to enhance the debond growth in plies within a cross-ply laminate.

Place, publisher, year, edition, pages
2018. Vol. 109, p. 463-471
Keywords [en]
A. Polymer-matrix composites (PMCs), B. Debonding, C. Finite element analysis (FEA), Composite structures, Crack closure, Crack propagation, Fibers, Finite element method, Joints (structural components), Laminated composites, Composite cross section, Cross-ply laminate, Hexagonal pattern, Homogenized composites, Polymer Matrix Composites (PMCs), Transverse loading, Unidirectional composites, Virtual crack closure technique, Polymer matrix composites
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Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-33978DOI: 10.1016/j.compositesa.2018.03.031Scopus ID: 2-s2.0-85044595517OAI: oai:DiVA.org:ri-33978DiVA, id: diva2:1230362
Note

Funding details: LighterLife; Funding details: VINNOVA; Funding text: Linqi Zhuang would like to thank European DocMASE program for the financial support.

Available from: 2018-07-03 Created: 2018-07-03 Last updated: 2018-07-03Bibliographically approved

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