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In Situ Characterization of Fiber-Matrix Interface Debonding via Full-Field Measurements



Macroscopic mechanical and failure properties of fiber-reinforced composites depend strongly on the properties of the fiber-matrix interface. For example, transverse cracking behavior and interlaminar shear strength of composites can be highly sensitive to the characteristics of the fiber-matrix interface. Despite its importance, experimental characterization of the mechanical behavior of the fibermatrix interface under normal loading conditions has been limited. This work reports on an experimental approach that uses in situ full-field digital image correlation (DIC) measurements to quantify the mechanical and failure behaviors at the fiber-matrix interface. Single fiber model composite samples are fabricated from a proprietary epoxy embedding a single glass rod. These samples are then tested under transverse tension. DIC is used to measure the deformation and strain fields in the glass rod, epoxy, and their interface vicinity. Initiation and propagation of the fiber-matrix debond are discussed. Full-field measurements are shown to facilitate the quantitative analysis of the traction-separation laws at the fiber-matrix interface subjected to transverse tension.


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Talreja, R. 1985. “Transverse cracking and stiffness reduction in composite laminates,” J. Compos.

Mater., 19: 355-375.

Zhuang L., Talreja R., Varna J. 2018. “Transverse crack formation in unidirectional composites by

linking of fibre/matrix debond cracks,” Compos. Part A, 107: 294-303.

Garcia I.G., Mantic V., Graciani E. 2015. “Debonding at the fibre-matrix interface under remote

transverse tension. One debond or two symmetric debonds?,” Euro. J. Mech. A/Solids, 53: 75-88.

Martyniuk K., Sorensen B.F., Modregger P., Lauridsen E.M. 2013. “3D in situ observations of glass

fiber/matrix interfacial debonding,” Compos. Part A, 55: 63-73.

Mehdikhani M., Aravand M., Sabuncuoglu B., Callens M.G., Lomov S.V., Gorbatikh L. 2016.

“Full-field strain measurements at the micro-scale in fiber-reinforced composites using digital

image correlation,” Compos. Struct., 140: 192-201.

Tracy J., Daly S., Sevener K. 2015. “Multiscale damage characterization in continuous fiber

ceramic matrix composites using digital image correlation,” J. Mater. Sci., 50: 5289-5299.

Montgomery C.B., Koohbor B., Sottos N.R. 2019. “A robust patterning technique for electron

microscopy-based digital image correlation at sub-micron resolution,” Exp. Mech., 56: 1063-1073.

Koohbor B., Montgomery C.B., White S.R., Sottos N.R. 2018. “Meso-scale strain measurements in

fiber reinforced composites,” 33rd Technical Conference of the American Society for Composites;

Seattle, WA, USA. DOI 10.12783/asc33/26028

Koohbor B., Ravindran S., Kidane A. 2018. “A multiscale experimental approach for correlating

global and local deformation response in woven composites,” Compos. Struct., 194: 328-334.

Koohbor B., Ravindran S., Kidane A. 2015. “Meso-scale strain localization and failure response of

an orthotropic woven glass-fiber reinforced composite,” Compos. Part B, 78: 308-318.

Koohbor B., Ravindran S., Kidane A. 2017. “Experimental determination of Representative

Volume Element (RVE) size in woven composites,” Opt. Laser. Eng., 90: 59-71.

Goodier J. 1933. “Concentration of stress around spherical and cylindrical inclusions and flaws,” J.

Appl. Mech., 55: 39-44.

Mantič V. 2009. “Interface crack onset at a circular cylindrical inclusion under a remote transverse

tension. Application of a coupled stress and energy criterion,” Int. J. Solid. Struct., 46(6): 1287-


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