Analysis of two experimental setups to study mode II fracture on fibre-reinforced gypsum notched specimens

Fernando Suárez; Javier Fernández-Aceituno; Jesús Donaire-Ávila

doi:10.3989/mc.2023.325822

Autores/as

Fernando Suárez Departamento de Ingenierı́a Mecánica y Minera. Universidad de Jaén https://orcid.org/0000-0002-8834-104X
Javier Fernández-Aceituno Departamento de Ingenierı́a Mecánica y Minera. Universidad de Jaén https://orcid.org/0000-0002-5994-3973
Jesús Donaire-Ávila Departamento de Ingenierı́a Mecánica y Minera. Universidad de Jaén https://orcid.org/0000-0003-4764-1852

DOI:

https://doi.org/10.3989/mc.2023.325822

Palabras clave:

Modo II, Cortante, Ensayo push-off, Correlación Digital de Imágenes, Yeso reforzado con fibras

Resumen

El principal objetivo de este trabajo es estudiar dos relevantes montajes experimentales diseñados para estudiar la rotura a cortante y comprobar si permiten estudiar la evolución de la fractura en Modo II y no sólo inducir una rotura por cortante al comienzo del proceso de fractura. Se han empleado dos ensayos, un ensayo estandarizado descrito en la normativa japonesa, referido aquí como JSCE, y el ensayo de push-off. Los ensayos se han realizado sobre probetas de yeso reforzado con fibras, empleando varias proporciones de fibras de polipropileno y se han monitorizado mediante correlación digital de imágenes (DIC). Los resultados muestran que es relativamente sencillo inducir una rotura en modo II con ambos ensayos pero, una vez se inicia la fractura, es extremadamente difícil lograr una evolución del proceso de fractura en condiciones de Modo II. En general, el Modo II tiene una fuerte influencia en el comienzo de la fractura, pero posteriormente el Modo I predomina.

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