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Toughening Behavior in Natural Fiber-reinforced Earth-basedComposites

Published online by Cambridge University Press:  12 January 2016

Kabiru Mustapha ,
Martiale G. Zebaze Kana  and
Winston O. Soboyejo
Kabiru Mustapha*
Affiliation:
Department of Materials Science and Engineering, Kwara State University, Malete, Nigeria.
Martiale G. Zebaze Kana
Affiliation:
Department of Materials Science and Engineering, Kwara State University, Malete, Nigeria.
Winston O. Soboyejo
Affiliation:
Department of Mechanical and Aerospace Engineering, Princeton University, Olden Street, Princeton, NJ 08544, USA.
*
*(Email: kabiru.mustapha@kwasu.edu.ng)
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Abstract

This study presents a combine experimental and analytical investigation of thetoughening behavior in natural fiber-reinforced earth-based composites. Aspecially designed single fiber pullout apparatus was used to provide aquantitative determination of interfacial properties that are relevant totoughening brittle materials through fiber reinforcement. The parametersinvestigated included a specially designed high strength earth-based matrixcomprising of 60% laterite, 20% clay and 20% cement. The toughening behavior ofwhisker-reinforced earth-based matrix is analyzed in terms of a whisker bridgingzone immediately behind the crack tip and interface strength. This approach isconsistent with microscopy observations which reveal that intact bridgingwhiskers exist behind the crack tip as a result of debonding of thewhisker-matrix interface. Debonding with constant frictional stress was obtainedand this formed the basis for the analytical model considered and the underlyingcrack-microstructure interactions associated with Resistance-curve behavior wasstudied using in situ/ex situ optical microscopy to account for the bridgingcontribution to fracture toughness. The effect of multiple toughening mechanisms(debonding and crack bridging) was elucidated and the implications of theresults are considered for potential applications in the design of robustearth-based building materials for sustainable eco-friendly homes.

Keywords

toughnesscompositefiber

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Type
Articles
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MRS Advances , Volume 1 , Issue 12: Mechanical Behavior and Failure of Materials , 2016 , pp. 791 - 797
Copyright
Copyright © Materials Research Society 2016 

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References

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