Fracture toughness measurements on bovine enamel by indentation techniques
Many works have attempted to estimate the fracture toughness of enamel by indentation techniques.Most of these works have in common the use of equations whose success in determining the actual value of fracture toughness depends on the particular three-dimensional pattern of cracks.Although microscopic techniques are usually employed,only a superficial image of the cracks is provided,and no information about the propagation within the enamel is given.Therefore,there is some uncertainty about the applicability of this type of equations.More recently,an alternative methodology based on an energetic approach has been developed to estimate the fracture toughness by depth sensing indentation that is not so affected by the cracks pattern generated.In this work,the energetic approach to indentation fracture toughness of bovine enamel is presented and compared with those toughness values obtained using the most common expressions reported in the literature.The results showed that some modifications in the energetic methodology should be performed in order to apply it successfully.
indentation fracture toughness enamel
J. Rodríguez M.A. Garrido L. Ceballos
Departamento de Tecnología Mecánica,Universidad Rey Juan Carlos,28933 Madrid,Spain Departamento de Estomatología,Universidad Rey Juan Carlos,28933 Madrid,Spain
国际会议
北京
英文
1-9
2013-06-16（万方平台首次上网日期，不代表论文的发表时间）