Artículo
Evaluation of interfacial fracture toughness and friction coefficient in the single fiber fragmentation test
Autor/es | Graciani Díaz, Enrique
Varna, J. Mantic, Vladislav Blázquez Gámez, Antonio París Carballo, Federico |
Departamento | Universidad de Sevilla. Departamento de Mecánica de Medios Continuos y Teoría de Estructuras |
Fecha de publicación | 2011 |
Fecha de depósito | 2018-04-10 |
Publicado en |
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Resumen | Single fiber fragmentation test is extensively employed to characterize the fiber-matrix interface in composites. A
novel technique for evaluating fracture toughness and friction coefficient at the fiber-matrix interface ... Single fiber fragmentation test is extensively employed to characterize the fiber-matrix interface in composites. A novel technique for evaluating fracture toughness and friction coefficient at the fiber-matrix interface in an epoxy sample containing a single glass fiber is proposed. Using experimental measurements of the average fragment and debond lengths, Boundary Element (BE) models of the portion of sample corresponding to the average fiber fragment are created for increasing values of the applied strain. From the solution of the BE models, energy release rate (ERR) during crack propagation is evaluated using a Fracture Mechanics based approach which accounts for fiber-matrix interfacial friction. The calculated evolution of the ERR has a reasonably linear dependency on the applied strain, with a decreasing slope for increasing values of the interfacial friction coefficient. Since debond growth is stable, ERR should equal the interfacial fracture toughness during debond propagation. Consequently, interfacial friction coefficient and fracture toughness can be simultaneously determined by parametrically varying the friction coefficient until a null slope is obtained in the linear fit of the numerical solution of the ERR as a function of the applied strain. The applicability of the proposed technique is demonstrated with experimental results taken from the literature. |
Agencias financiadoras | Junta de Andalucía |
Identificador del proyecto | P08-TEP-04051 |
Cita | Graciani Díaz, E., Varna, J., Mantic, V., Blázquez Gámez, A. y París Carballo, F. (2011). Evaluation of interfacial fracture toughness and friction coefficient in the single fiber fragmentation test. Procedia Engineering, 10, 2478-2483. |
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evaluation.pdf | 311.1Kb | [PDF] | Ver/ | |