Mechanism of Crack Stopping by Weak Fiber-Matrix Interface in Unidirectional Composites

A mechanism of crack stopping by weak fiber-matrix interface in unidirectional composite is specified. The asymptotic analysis of stress state near the elongated elliptical hole in orthotropic plate has shown that splitting at this hole occurs mainly due to shear stresses along the fibers. These she...

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Bibliographic Details
Published in:Mechanics of composite materials Vol. 61; no. 3; pp. 489 - 500
Main Authors: Polilov, A. N., Vlasov, D. D.
Format: Journal Article
Language:English
Published: New York Springer US 01.07.2025
Springer Nature B.V
Subjects:
Ceramics
Characterization and Evaluation of Materials
Chemistry and Materials Science
Classical Mechanics
Composites
Cracks
Elastic analysis
Elastic anisotropy
Elastic properties
Fiber-matrix interfaces
Fractures
Glass
Interfaces
Materials Science
Natural Materials
Orthotropic plates
Shear stress
Solid Mechanics
Splitting
Stress analysis
Stress concentration
Stress state
Unidirectional composites
splitting
delamination
polymer matrix
strength reduction factor (SRF)
crack
stress concentration factor (SCF)
weak interface
composite material
elliptical hole
ISSN:0191-5665, 1573-8922
Online Access:Get full text
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Summary:A mechanism of crack stopping by weak fiber-matrix interface in unidirectional composite is specified. The asymptotic analysis of stress state near the elongated elliptical hole in orthotropic plate has shown that splitting at this hole occurs mainly due to shear stresses along the fibers. These shear stresses reach the highest value at the hole contour and depend weakly on the degree of material elastic properties anisotropy. Analyzing the highest values of stresses near the hole, it is possible to estimate the appropriate material characteristics for the crack stopping mechanism realization. The role of the remaining after splitting notch was considered. It was obtained that the real stress concentration factor at hole in unidirectional composites after splitting is not higher than 2. This value occurs near the remaining shallow notch and is several times lower, than the regular theoretical stress concentration factor in plate near circular or elliptical hole, determined numerically or analytically.
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ISSN:0191-5665
1573-8922
DOI:10.1007/s11029-025-10288-5