PSI - Issue 6

Mayao Wang et al. / Procedia Structural Integrity 6 (2017) 64–68 M. Wang et al. / Structural Integrity Procedia 00 (2017) 000–000

66

3

1.07 to 2.24 MPa(m) 1/2 and the slope of R-curve from 1.76 to 2.38 MPa(m) 1/2 /mm. The crack propagation paths in simulations of two statistical realizations of micro-morphology are presented as Figure 2.

(a)

(b) Figure 1. (a) Typical micro-image of human cortical bone (black arrow indicating osteon and red arrow indicating interstitial matrix); (b) the dimension of compact tension model (green area-homogenous domain; red area-microstructural domain)

Table 1. Material properties of microstructural constituents of cortical-bone tissue (Budyn & Hoc 2007)

Strain energy release rate (N/mm)

Elastic modulus (GPa)

Constituent

Poisson’s ratio

Osteon

13.50 14.60 10.12

0.33

0.120 0.132 0.084

Interstitial matrix

0.3

Cement line

0.41