Simultaneous Measurement of Fiber-Matrix Interface Debonding and Tunneling Using a Dual-Vision Experimental Setup

Simultaneous Measurement of Fiber-Matrix Interface Debonding and Tunneling Using a Dual-Vision Experimental Setup

Background Fiber-matrix debonding is a precursor for transverse cracking and several other types of damage in fiber composites. However, to date, there are limited experiment-based reports that study the fundamental mechanisms of fiber-matrix debonding. Objective This work aims to uncover the govern...

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Bibliographic Details
Published in:Experimental mechanics Vol. 64; no. 9; pp. 1497 - 1511
Main Authors: Uddin, K. Z., Girard, H., Mennie, N. B., Doitrand, A., Koohbor, B.
Format: Journal Article
Language:English
Published: New York Springer US 01-11-2024
Springer Nature B.V
Society for Experimental Mechanics
Subjects:
Biomedical Engineering and Bioengineering
Characterization and Evaluation of Materials
Control
Crack initiation
Crack tips
Cracking (fracturing)
Damage detection
Debonding
Digital imaging
Displacement measurement
Dynamical Systems
Engineering
Fiber composites
Fiber-matrix interfaces
Lasers
Optical Devices
Optics
Photonics
Physics
Propagation
Propagation modes
Propagation velocity
Research Paper
Shear stress
Solid Mechanics
Strain
Stress propagation
Vibration
Vision systems
Damage mechanics
Digital image correlation
Fiber-matrix debonding
Transverse cracking
Digital image correlation B. Koohbor is a member of SEM
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Description
Summary:Background Fiber-matrix debonding is a precursor for transverse cracking and several other types of damage in fiber composites. However, to date, there are limited experiment-based reports that study the fundamental mechanisms of fiber-matrix debonding. Objective This work aims to uncover the governing mechanisms of fiber-matrix interface debonding by full-field measurements supplemented by numerical simulations. In particular, the application of a dual-vision image-based characterization approach on single glass macro fiber samples is discussed and proven useful in understanding the in-plane and out-of-plane debonding characteristics at the fiber-matrix interface. Methods Full-field strain and displacement measurements based on digital image correlation are performed on model single-fiber composites. The use of a dual-vision system allows strain measurements in the vicinity of the fiber-matrix interface, also allowing for the identification of critical strain and stress values corresponding to the initiation and propagation of debonding damage. The experimental data are used to calibrate an inverse identification approach that outputs the shape of the debonded interface along the fiber length. Results Full-field measurements allow for establishing correlations between local and global strain fields. Observation of debonding propagation along the fiber axis seems to be representative of the crack tunneling during the early stages of the failure process, i.e., when the crack tip is subjected to opening mode only. Conclusions Side view measurements are useful as a first-order approximation of the debonding propagation velocity along the fiber axis but fail to provide accurate measurements for the debonding shape, esp. in areas where the crack is under a dominantly shear stress state. This issue can be resolved by full-field measurements coupled with computational simulations.
ISSN:0014-4851
1741-2765
DOI:10.1007/s11340-024-01111-8