Resistencia mecanica e tenacidade a fratura do osso cortical bovino / Mechanical strength and fracture toughness of cortical bovine bone

AUTOR(ES)
DATA DE PUBLICAÇÃO

2006

RESUMO

Stress fractures are caused by fatigue exercising in bones that occur in young health people who are submitted to rigorous physical training. It?s known that its path physiology is characterized by initiation and propagation of microcracks. Thus, the purpose of this study is to identify some of the mechanical properties of cortical bone that approach to the tension conditions originated in physical activities. A rectangular beam of bovine cortical bone was then tested in three-point bending to determine the values of modulus of rupture and Young?s modulus of bone. Fracture toughness tests were conducted in single-edge-notched specimens. Results showed that bone is a strength material, with averaged modulus of rupture of 227.5 MPa, and a low value of fracture toughness averaged in 9.6 MPa.m1/2. The fractographic analyses of tested specimens showed that bones have some characteristic fracture mechanisms during failure and its microstructures influence the initiation and propagation of cracks, making it more or less resistant to crack propagation

ASSUNTO(S)

propriedades mecanicas fractografia cortical bone mecanica da fratura ossos mechanical properties fracture toughness resistencia dos materiais strength fractography

ACESSO AO ARTIGO

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