期刊
COMPOSITES PART C: OPEN ACCESS
卷 9, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jcomc.2022.100302
关键词
Brittle matrix; Digital volume correlation; Displacement jump; Fractal geometry; Measurement uncertainty
资金
- ENS Paris-Saclay International Incoming Scholarship Program, France
- Italian Ministry of University and Research, Italy [2017J4EAYB]
- French-German Doctoral College SNTA
- French Agence Nationale de la Recherche, France through the Investissements d'avenir program [ANR-10-EQPX-37 MATMECA]
- Italian Ministry of University and Research (MUR) under the PRIN [2020WEFKX5]
In this study, the debonding behavior of fractal fibers embedded in brittle matrices was investigated using X-ray tomography. It was found that there is an articulated load transfer mechanism between the fiber and matrix, and the fiber-matrix interlocking can be affected by geometry-driven tensile stiffening effects between the ribs.
The quantification of debonding was performed for additively manufactured fractal'' fibers embedded within two brittle matrices. Three pull-out tests were carried out inside of an X-ray tomograph allowing for Digital Volume Correlation analyses. Relative motions at the interfaces were measured thanks to adapted meshes with split nodes. Profiles of normal, tangential and vertical displacement jumps as well as vertical strains in the fibers were used to study interfacial debonding. An articulated load transfer mechanism between the fiber and the matrix was observed in the examined tests, as demonstrated by zigzagged distributions of vertical displacement jumps and vertical strain profiles in the fibers at the initial stages of pull-out. Vertical strain concentrations were observed in correspondence to lateral protrusions (or ribs) of the reinforcing fibers. These results suggest that fiber-matrix interlocking may be affected by geometry-driven tensile stiffening effects between the ribs. For larger values of pull-out displacements, more diffuse damage of the fiber-matrix interface was observed between the ribs, especially in plaster matrices.
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