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2 Advances in Materials Science

2 2005

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Quantitative evaluation of the fracturing process of natural composite on example of the cortical part of bone

Ranatowski M., Ranatowski E.

Advances in Materials Science

2005

Vol. 5, nr 1-3

69--74

Modelling of local failures of the natural composite - bone is based on the solution of a number of problems involving the interaction of macrocrack with voids, crazes and micro cracks in heterogeneous material. Base upon the concept of microcrack precursor nucleation, a micromechanics model is used to study the formation of near-tip microcracking and consequent toughening effects. ultimately it causes a redistribution of stresses in the near-tip stress field of the macrocrack and this can affect the stress intensity factor (SIF) CTOD and fracture toughness.

Analysis of the fracturing process of natural composite on example of the cortical part of bone

Ranatowski M., Ranatowski E.

Advances in Materials Science

2005

Vol. 5, nr 1-3

63--68

The short characteristics of the natural composite-bone is given. The parameters which characterised the bone mineral density (BMD) such as DEXA and QCT are presented. Furthermore, based upon the concept of cortical index CI, the characteristics of this one and short discussion about them - with possibility to predict the bone strength and fracture resistance - are made. Finally, the information about capability of the used fracture mechanics parameters such as K and delta to quantitative assessment of the fracture of cortical part of bone are presented.