Fig. 6: Proposed theories involving the bending of collagen fibrils and the oblique effect of HA crystals to explain the stress increase during the stress fluctuation stages.
From: Aggravated stress fluctuation and mechanical size effects of nanoscale lamellar bone pillars
a Diagram of the distribution of HA crystals and collagen fibrils—the orientations of collagen fibrils were considered approximately uniform inside a single lamella and independent of pillar diameter—a discontinuous fracture theory of collagen fibrils was also illustrated involving a slow stress increase process owing to the bending of collagen fibrils and a rapid stress release owing to the instantaneous fracture of collagen fibrils with relatively large length–diameter ratios; b calculation of oblique angle θha and movement distance fha of a single HA crystal by analyzing the superposition behavior induced by the bending and compressive stress components.
