聚醚醚酮各向异性3D打印对股骨替代物力学性能的影响
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西安交通大学 机械工程学院 机械制造系统工程国家重点实验室 西安

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Effects of PEEK anisotropy formed by material extrusion on the mechanical properties of femoral substitutes
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    摘要:

    目的:针对材料挤出成形3D打印聚醚醚酮(PEEK)骨替代物制造工艺存在明显各向异性的问题,以下肢股骨为例,研究不同打印摆放方式下3D打印PEEK股骨替代物的力学性能。方法:在有限元模型中模拟人体步态周期中五种姿态,改变正交各向异性参数计算不同打印摆放方式下股骨应力与变形,并通过替代力学实验研究3D打印PEEK股骨的安全性与稳定性。结果:竖直摆放优于水平摆放方式,此时3D打印PEEK股骨替代物应力最大值为46.56 MPa,低于PEEK材料的屈服强度但变形量大于自然股骨,满足服役过程中力学性能需求而承载稳定性有待提高。结论:材料挤出成形各向异性对下肢承重骨替代物的力学性能有显著影响,3D打印制备承重骨时应优先采用竖直摆放的方式。

    Abstract:

    Objective:Aiming at the problem of significant anisotropy in the 3D printed polyether-ether-ketone (PEEK) bone substitutes manufactured by material extrusion technology, taking the femur, the main load-bearing long bone of the lower limb, as an example, the biomechanical properties of the femoral model under different direction in the build chamber were evaluated by the combination of finite element analysis and in-vitro mechanical experiment. Methods:A left femoral model was obtained by reconstruction from CT data. The stress and displacement of the 3D printed PEEK femur with different directions in the build chamber under five physiological postures in the human gait cycle were simulated by varying the orthogonal anisotropy mechanical properties. An in-vitro mechanical experiment was conducted to investigate the safety and stability of the femur through a 3D printed PEEK femur. Results: When the long axis of the femur model was perpendicular to the building platform of the 3D printer, a better mechanical property was obtained with maximum von Mises stress was 46.56 MPa which was lower than the yield stress of PEEK, while the maximum displacement was larger than that of the natural femur under same loading condition. Therefore, the 3D printed PEEK femur met the strength requirement but the stability needs to be improved. Conclusions :The anisotropy of material extrusion has a significant effect on the mechanical properties of the 3D printed bone substitute, and the long axis is recommended to be perpendicular to the building platform during the 3D printing of the substitute of the load-bearing long bone.

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  • 收稿日期:2022-04-14
  • 最后修改日期:2022-06-10
  • 录用日期:2022-06-16
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