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Enhancement of fiber–matrix adhesion by laser ablation-induced surface microcorrugation

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Abstract

Micrometer-sized surface corrugations produced on Kevlar fiber surfaces by laser ablation were found to dramatically enhance the mechanical adhesion between the fibers and the epoxy matrix in a fiber-reinforced composite. Symmetric and asymmetric corrugation structures were produced by irradiating the fibers with high-fluence UV laser pulses at various incidence angles. The interfacial shear strength (IFSS) between the fibers and the matrix was measured using the microbond fiber-pullout method. Upon laser ablation treatment, the IFSS increased by 120% with symmetric corrugation profiles obtained with laser irradiation normal to the fiber axis, and 5-fold with asymmetric corrugation profiles obtained with the laser incidence angle at 45° to the fiber axis. A similar enhancement was observed in pullout tests under wet conditions. A simple model based on an elementary analysis of the expected strain field in the presence of interface corrugation is found to provide a quantitative explanation of the observed strength enhancement factors.

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Notes

  1. Equation 2, solved for \( s_{\bot} \), may be interpreted as the power series expansion of the exact (but unknown) dependence of the normal interface strength \( s_{\bot } \) on the applied shear stress \( s_{\parallel } \) up to second order in \( s_{\parallel } \). Since a reversal of the sign of \( s_{\parallel } \) should have no effect on the perpendicular strength, \( s_{\bot } \) is an even function of \( s_{\parallel } \), i.e., the linear term in the power series expansion vanishes.

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Acknowledgements

The authors acknowledge Y. Kamath for helpful discussions on the experimental aspect of the pullout tests and R. Govinthasamy for preliminary work on this project. The study was funded by the National Science Foundation under award # DMR-0513926.

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Authors and Affiliations

  1. New Jersey Center for Biomaterials, Rutgers University, Piscataway, NJ, 08854, USA

    Fahmi Bédoui & N. Sanjeeva Murthy

  2. Department of Physics and Astronomy and Laboratory for Surface Modification, Rutgers University, Piscataway, NJ, 08854, USA

    Frank M. Zimmermann

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  1. Fahmi Bédoui
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  2. N. Sanjeeva Murthy
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  3. Frank M. Zimmermann
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Correspondence to N. Sanjeeva Murthy.

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Bédoui, F., Murthy, N.S. & Zimmermann, F.M. Enhancement of fiber–matrix adhesion by laser ablation-induced surface microcorrugation. J Mater Sci 43, 5585–5590 (2008). https://doi.org/10.1007/s10853-008-2805-9

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