Measurement of the microstructural fracture toughness of cortical bone using indentation fracture

Nanoindentation of wet and dry compact bone: Influence of environment and indenter tip geometry on the indentation modulus

“…Indenting bone may contribute to wedging open and breaking the weak bonds present while using HBSS due to the imposed tensile stresses, thereby increasing the measured penetration depths and resulting in a more compliant structure. Mullins and co-workers [48] found that for Berkovich, Vickers and cube corner indenters, only the latter generated cracks in their bovine compact bone samples (The effective half cone angle of cube corner indenters is 42.28º, which is close to the 45º half cone angle indenter used in the present work). Upon removal of the load the bonds are restored as observed with the higher viscoelastic recovery of the wet condition.…”

Determination of fracture toughness using the area of micro-crack tracks left in brittle materials by Vickers indentation test

“…In this approach, small surface cracks with controlled size and shape are easily created by indenters such as Bercovich, Conical and Vickers [10,11], which leave a series of these cracks on the specimen. By examining the morphology of these cracks, the fracture toughness of the specimen is determined [12]; less equipment and raw materials (for samples) are needed, and the speeds of sample  preparation and testing are higher compared to other methods [13].…”

Processamento de hidroxiapatita bovina associada com prototipagem rápida visando implantes ósseos

“…A tenacidade à fratura foi calculada através da indentação Vickers, esta técnica tem sido bastante utilizada para estudar o comportamento de fratura de biomateriais e tecidos duros (KRUZIC et al, 2009;MULLINS;BRUZZI;McHUGH, 2007;MARSHALL et al 2001). Também se tornou muito difundido para materiais frágeis, principalmente vidros e cerâmicas, pois pode ser realizado em pequenas amostras, a preparação das amostras é relativamente simples, sendo necessário apenas uma superfície plana e polida, o penetrador de …”