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Microcrack propagation trajectory under tension in the Raeisi Najafi et al. [74] model—the propagation trajectory was deviated as approaching the osteon: (a) primary microcrack, (b–d) propagated microcrack with (b) E0 = 10 GPa, Ei = 26 GPa, Ec = 6 GPa; (c) E0 = 19 GPa, Ei = 26 GPa, Ec = 6 GPa; (d) E0 = 19 GPa, Ei = 15 GPa, Ec = 24 GPa.
