Tensile and compressive strain evolutions of bovine compact bone under four-point bending fatigue loading. (November 2021)

• Record Type: Journal Article
• Authors: Meng, Xianjia; Qin, Qinghua; Qu, Chuanyong
• Is Part Of: Journal of the mechanical behavior of biomedical materials. Volume 123(2021)
• Publication Date: 2021-11
• Subjects: Bone fatigue -- Neutral axis -- Digital image correlation -- Tensile and compressive strains; Biomedical materials -- Periodicals; Biomedical materials -- Mechanical properties -- Periodicals; Biomedical materials; Biomedical materials -- Mechanical properties; Periodicals; Electronic journals; 610.28
• DOI: 10.1016/j.jmbbm.2021.104774
• Languages: English
• ISSNs: 1751-6161

Abstract

Abstract: Bones are biological composite materials with multiscale structures. Bone fatigue damage is commonly characterized by an increase in strain that is accompanied by microdamage at different scales. This study investigated the damage evolutions of bone specimens under four-point bending fatigue loading using neutral axis migration. Tensile and compressive strains during the fatigue process were simultaneously measured using a digital image correlation technique. The compressive strain of the bone specimen increased rapidly at first and then proceeded slowly while the tensile strain decreased during fatigue loading. Consequently, the neutral axis shifted downward as the damage accumulated. A positive correlation exists between the downward offset of the neutral axis and the number of cycles. The variation in compressive strain is larger than that in tensile strain in this situation. Graphical abstract: Image 1 Highlights: Damage of bones during fatigue process was investigated using neutral axis migration. Tensile and compressive strains were simultaneously measured using a DIC method. Compressive strain increased while the tensile strain decreased during fatigue loading. The neutral axis shifted downward as the damage accumulated. Variation in compressive strain is larger than that in tensile strain in this situation.