Open Access Open Access  Restricted Access Subscription Access

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

ROBERT LIVINGSTON, BEHRAD KOOHBOR

Abstract


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.


DOI
10.12783/asc36/35899

Full Text:

PDF

References


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

Mater., 19: 355-375.

https://doi.org/10.1177/002199838501900404

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.

https://doi.org/10.1016/j.compositesa.2018.01.013

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.

https://doi.org/10.1016/j.euromechsol.2015.02.007

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.

https://doi.org/10.1016/j.compositesa.2013.07.012

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.

https://doi.org/10.1016/j.compstruct.2015.12.020

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.

https://doi.org/10.1007/s10853-015-9076-z

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.

https://doi.org/10.1007/s11340-019-00487-2

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

http://www.dpi-proceedings.com/index.php/asc33/article/view/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.

https://doi.org/10.1016/j.compstruct.2018.04.016

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.

https://doi.org/10.1016/j.compositesb.2015.03.064

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

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

https://doi.org/10.1016/j.optlaseng.2016.10.001

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

Appl. Mech., 55: 39-44.

https://doi.org/10.1177/073168448300200103

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-

https://doi.org/10.1016/j.ijsolstr.2008.10.036


Refbacks

  • There are currently no refbacks.