Sociedad Española de Integridad Estructural
Grupo Español de Fractura

Sociedad Española de Integridad Estructural
Grupo Español de Fractura

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Numerical modelling on the pullout response of a steel fibre inclined at an arbitrary angle

Rena C. Yu  Hui Zhang  Gonzalo Ruiz  Shilang Xu     

Anales de la Mecánica de la Fractura, nº 33 . 2016 . Pág. 455 -460
Ver (.pdf): Anales33-073

Resumen: It is well-known that fibres improve the performance of cementitious composites by acting as bridging ligaments in cracks. Such bridging behaviour is often studied through the fibre pullout tests. The relation between the pullout force versus slip end displacement is characteristic of the fibre-matrix interface. However, such a relation varies significantly with the fibre inclination angle. In the current work, we establish a numerical model to explicitly represent the fibre, matrix and the interface for arbitrary fibre orientations. Cohesive elements endorsed with mixed-mode fracture capacities are implemented to represent the bond-slip behaviour at the interface. Contact elements with Coulomb’s friction are placed at the interface to simulate frictional contact. Matrix spalling is modelled through material erosion. The bond-slip behaviour is first calibrated through pull-out curves for fibres aligned with loading direction, then validated against experimental results carried out by Leung and Shapiro in 1999 for steel fibres oriented at 30º and 60º. Parametric studies are then performed to explore the influences of both material properties (fibre yield strength, matrix tensile strength, interface bond) and geometric factors (fibre diameter, embedment length and inclination angle) on the overall pullout behaviour, in particular on the maximum pullout load. The proposed methodology provides the necessary pull-out curves for a fibre oriented at a given angle for multi-scale models to study fracture in fibre-reinforced cementitious materials.

LocalizaciónSan Sebastián

E.T.S. de Ingenieros de Caminos, Canales y Puertos, Universidad de Castilla la Mancha Avenida Camilo José Cela s/n, 13071 Ciudad Real
Zhejiang University, Hangzhou, China
E.T.S. de Ingenieros de Caminos, Canales y Puertos, Universidad de Castilla la Mancha Avenida Camilo José Cela s/n, 13071 Ciudad Real
Zhejiang University, Hangzhou, China



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