Fracture in porous bone analysed with a numerical phase-field dynamical model. (March 2023)

• Record Type: Journal Article
• Authors: Carlsson, Jenny; Braesch-Andersen, Anna; Ferguson, Stephen J.; Isaksson, Per
• Is Part Of: Journal of the mechanical behavior of biomedical materials. Volume 139(2023)
• Publication Date: 2023-03
• Subjects: Trabecular bone -- Phase-field model -- Rapid bone fracture; Biomedical materials -- Periodicals; Biomedical materials -- Mechanical properties -- Periodicals; Biomedical materials; Biomedical materials -- Mechanical properties; Periodicals; Electronic journals; 610.28
• DOI: 10.1016/j.jmbbm.2023.105659
• Languages: English
• ISSNs: 1751-6161

Abstract

Abstract: A dynamic phase-field fracture finite element model is applied to discretized high-resolution three-dimensional computed tomography images of human trabecular bone to analyse rapid bone fracture. The model is contrasted to quasi-static experimental results and a quasi-static phase-field finite element model. The experiment revealed complex stepwise crack evolution with multiple crack fronts, and crack arrests, as the global tensile displacement load was incrementally increased. The quasi-static phase-field fracture model captures the fractures in the experiment reasonably well, and the dynamic model converges towards the quasi-static model when mechanically loaded at low rates. At higher load rates, i.e., at larger impulses, inertia effects significantly contribute to an increased initial global stiffness, higher peak forces and a larger number of cracks spread over a larger volume. Since the fracture process clearly is different at large impulses compared to small impulses, it is concluded that dynamic fracture models are necessary when simulating rapid bone fracture.