Sociedad Española de Integridad Estructural
Grupo Español de Fractura

Sociedad Española de Integridad Estructural
Grupo Español de Fractura

Publicaciones del Grupo Español de Fractura

Listado de Publicaciones

Todas estas publicaciones se ofrecen de forma gratuita y son de libre difusión. También puedes descargar las actas completas».

REPETITIVE NANO-IMPACT TESTS AS A NEW TOOL TO MEASURE FRACTURE TOUGHNESS IN BRITTLE MATERIALS

E. Frutos  J. L. González-Carrasco  T. Polcar      

Anales de la Mecánica de la Fractura, nº 33 . 2016 . Pág. 124 -130
Ver (.pdf): Anales33-019

Resumen: This work studies the feasibility of using repetitive-nano-impact tests with a cube-corner tip and low loads for obtaining quantitative fracture toughness values in thin and brittle coatings. However, the length of the crack has to be lower than 10% of the total coating thickness to avoid substrate contributions. For this reason, and in order to ensure a small plastic region localized at the origin of the crack tip, low load values have to be used. Moreover, it will be shown how it is possible to know with each new impact the crack geometry evolution from Palmqvist crack to half-penny crack, being able to study the proper evolution of the different values of fracture toughness in terms of both indentation models and as a function of the strain rate, ???, decreasing. Thereby, fracture toughness values for ?-Al2O3 layer decrease from ~4.40 MPa?m, for high ??? value (103 s-1), to ~3.21 MPa?m, for quasi-static ??? value (10-3 s-1). On the other hand, a new process to obtain fracture toughness values will be analysed, when the classical indentation models are not met. These values are the typically found in the literature for bulk ?-Al2O3, demonstrating the use of repetitive-nano-impact tests not only provide qualitative information about fracture resistance of the materials but it also can be used to obtain quantitative information as fracture toughness values in the case of brittle materials.

LocalizaciónSan Sebastián

Department of Control Engineering, Faculty of Electrical Engineering, Czech Technical University in Prague, Technická 2, Prague 6, Czech republic
Centro Nacional de Investigaciones Metalúrgicas, CENIM-CSIC, Avda. Gregorio del Amo 8, 28040 Madrid, Spain.
Department of Control Engineering, Faculty of Electrical Engineering, Czech Technical University in Prague, Technická 2, Prague 6, Czech republic




Enlaces directos

Últimas noticias

Contacto

Información general
info@gef.es

Administración
secretaria@gef.es

Cuotas y recibos
socios@gef.es