Characteristics of the double-torsion test to determine the R-curve of ceramic materials



Document title: Characteristics of the double-torsion test to determine the R-curve of ceramic materials
Journal: Materials research
Database: PERIÓDICA
System number: 000312930
ISSN: 1516-1439
Authors: 1
2
Institutions: 1Universidade Estadual Paulista "Julio de Mesquita Filho", Faculdade de Engenharia, Ilha Solteira, Sao Paulo. Brasil
2Universidade Federal de Sao Carlos, Departamento de Engenharia de Materiais, Sao Carlos, Sao Paulo. Brasil
Year:
Season: Oct-Dic
Volumen: 9
Number: 4
Pages: 361-368
Country: Brasil
Language: Inglés
Document type: Nota breve o noticia
Approach: Experimental
English abstract Double-torsion tests were carried out on a commercial ceramic floor tile to verify whether this test is suitable for determining the R-curve of ceramics. The instantaneous crack length was obtained by means of compliance calibration, and it was found that the experimental compliance underestimates the real crack length. The load vs. displacement curves were also found to drop after maximum loading, causing the stress intensity factor to decline. The R-curves were calculated by two methods: linear elastic fracture mechanics and the energetic method. It was obtained that the average values of crack resistance, R, and the double of the work of fracture, 2 × gwof, did not depend on notch length, a0, which is a highly relevant finding, indicating that these parameters were less dependent on the test specimen's geometry. The proposal was to use small notches, which produce long stable crack propagation paths that in turn are particularly important in the case of coarse microstructures
Disciplines: Ingeniería,
Química
Keyword: Ingeniería de materiales,
Ingeniería mecánica,
Química de polímeros,
Cerámica,
Aceite de ricino,
Propiedades mecánicas,
Biomedicina
Keyword: Engineering,
Chemistry,
Materials engineering,
Mechanical engineering,
Polymer chemistry,
Ceramics,
Castor oil,
Mechanical properties,
Biomedicine
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