TY - JOUR
T1 - Improving the mechanical properties and corrosion resistance of biodegradable Mg-Zn-Ca-Mn alloy bone screw through structural optimization
AU - Jiao, Ziyue
AU - Lyu, Shaoyuan
AU - Wang, Liang
AU - You, Chen
AU - Chen, Minfang
N1 - Publisher Copyright:
© 2022 The Authors.
PY - 2022/11
Y1 - 2022/11
N2 - Bone screw is a representative device for internal fixation. However, Mg alloy bone screw is subjected to complex loads after implantation and leads to stress concentration in specific site, resulting in rapid local degradation. In order to alleviate the local stress concentration of bone screw, structural optimization was carried out through finite element analysis method in this work. The models related to the size parameters of screw such as inner diameter, pitch and tooth angle, were established to explore the influence of them on the stress concentration through orthogonal experiment in loading conditions of three-point bending, torsion and pull-out. The stress state of the screw under the action of multi-factor coupling was analyzed, and the optimal size parameters of the screw were obtained, that is, the inner diameter was 2.5 mm, the pitch was 1.15 mm, the tooth type angle α was 5°, and the tooth type angle β was 40°. In addition, the mechanical properties and corrosion behavior of the screw before and after optimization were verified by experiments. The experimental results showed that the mechanical properties of the screw after optimization were improved, and the screw after optimization had better corrosion resistance than that of the screw before optimization.
AB - Bone screw is a representative device for internal fixation. However, Mg alloy bone screw is subjected to complex loads after implantation and leads to stress concentration in specific site, resulting in rapid local degradation. In order to alleviate the local stress concentration of bone screw, structural optimization was carried out through finite element analysis method in this work. The models related to the size parameters of screw such as inner diameter, pitch and tooth angle, were established to explore the influence of them on the stress concentration through orthogonal experiment in loading conditions of three-point bending, torsion and pull-out. The stress state of the screw under the action of multi-factor coupling was analyzed, and the optimal size parameters of the screw were obtained, that is, the inner diameter was 2.5 mm, the pitch was 1.15 mm, the tooth type angle α was 5°, and the tooth type angle β was 40°. In addition, the mechanical properties and corrosion behavior of the screw before and after optimization were verified by experiments. The experimental results showed that the mechanical properties of the screw after optimization were improved, and the screw after optimization had better corrosion resistance than that of the screw before optimization.
KW - Bone screw
KW - Experiments
KW - Finite element analysis
KW - Mg alloy
KW - Parameter optimization
UR - http://www.scopus.com/inward/record.url?scp=85144613158&partnerID=8YFLogxK
U2 - 10.1016/j.jmrt.2022.10.004
DO - 10.1016/j.jmrt.2022.10.004
M3 - Article
AN - SCOPUS:85144613158
SN - 2238-7854
VL - 21
SP - 1442
EP - 1453
JO - Journal of Materials Research and Technology
JF - Journal of Materials Research and Technology
ER -