肩锁关节固定系统的力学性能研究

Study on mechanics of an acromioclavicular fixation system

目的测定自行研制的肩锁关节固定系统的力学性能。方法肩锁关节固定系统采用钛合金设计制造,由肩锁关节解剖钢板和T形螺杆两部分组成。分别测定该系统的各种力学性能。结果肩锁关节解剖钢板疲劳极限强度为428.0Mpa,拉伸强度极限为578.0MPa,屈服极限为462.4MPa,延伸率为19.4%;弯曲强度为182.0MPa,弯曲桡度为8.7mm,最大弯曲力矩为14.0Nm;最大扭矩为236.0Nm,最大扭角为4.4°。T形螺杆弯曲强度为582.4MPa,弯曲桡度为11.6mm,最大弯曲力矩为13.8Nm;剪切强度为320.0MPa,剪切变形4.1mm,最大剪切力为7256N。结论自行设计的肩锁关节固定系统的各种力学数据能够满足人体肩锁关节的生理承载要求。

Objective To evaluate the mechanical properties of acromioclavicular fixation system（AFS） designed by ourselves.Method AFS included two parts,an anatomical acromioclavicular plate and a T-shape bolt,all manufactured with titanium alloy.The mechanical properties of AFS were evaluated.Results Fatigue limit intensity of the anatomical acromioclavicular plate was 428.0 MPa with tensile limit intensity 578.0 MPa,yield limit 462.4 MPa,percentage of elongation 19.4%,bending strength 182.0 MPa,maximum bending deflection 8.7 mm,maximum bending moment 14.0 Nm,maximum torsional moment 236.0 Nm,and maximum torsional angle 4.4°.Bending intensity of T-shaped bolt was 582.4 MPa with bending deflection 11.6 mm,maximum bending moment 13.8 Nm,shearing intensity 320.0 MPa,shearing deformation 4.1 mm and maximum shearing force 7 256 N.Conclusion The mechanical properties of AFS will meet with the physical loading requirement of human acromioclavicular joint.