• CN：11-2187/TH
• ISSN：0577-6686

• 制造工艺与装备 •

### 面向3D打印可变模量金属假体的微结构设计*

1. 1. 西安交通大学机械制造系统工程国家重点实验室 西安 710049；
2. 陕西恒通智能机器有限公司 西安 710049;
3. 利兹大学机械工程学院 利兹 LS2 9JT 英国
• 出版日期:2017-03-05 发布日期:2017-03-05
• 作者简介:

康建峰，男，1988年出生，博士研究生。主要研究方向为仿生制造与医疗修复工程。

E-mail：kjfmg@sina.com

王玲(通信作者)，女，1979年出生，博士，副教授，博士研究生导师。主要研究方向为生物制造、生物力学、生物摩擦学、组织工程。

E-mail：menlwang@mail.xjtu.edu.cn

• 基金资助:
* 陕西省科技统筹工程计划(2014KTZB01-02-02)和中央高校基本科研业务费专项资金资助项目; 20160311收到初稿，20160918收到修改稿;

### Microstructure Design for 3D Printed Metal Prosthesis of Adjustable Modulus

KANG Jianfeng1, WANG Ling1, SUN Changning1, LI Dichen1，2, JIN Zhongmin1，3

1. 1. State Key Laboratory for Manufacturing Systems Engineering， Xi’an Jiaotong University， Xi’an 710049；
2. Shaanxi Hengtong Intelligent Machines Co. Ltd.， Xi’an 710049；
3. School of Mechanical Engineering， University of Leeds， Leeds LS2 9JT， UK
• Online:2017-03-05 Published:2017-03-05

Abstract:

In order to avoid the stress shielding caused by the difference of elastic modulus between human bone and the prosthetic implant, porous design can be effective to reduce the effectively modulus of the prostheses. However, how to optimize the microstructure geometric parameters for better matching with the bone tissue has not been solved yet. By taking the advantages of 3D printing technology on customized microstructure manufacture, a design method to adjust the modulus of the metal prosthetic for better matching with the bone tissue is proposed in this study, to obtain satisfactory and manufacturable prosthesis by 3D printing. The elastic modulus of two porous lattices along the edge direction, surface diagonal and body diagonal have been calculated individually by implementing the finite element method (FEM). Thereafter the functional relationship between the equivalent elastic modulus and the strut diameter has been established. The anisotropy characteristics of the microstructure has been analyzed along with the change of the strut diameter, and the influence of the edge diameter and the lattice size on the elastic modulus has been investigated as well. Within the limitation of manufacturing capacity of metal 3D printing, the calculated equivalent elastic modulus of the prosthesis were found to be consistent with those of the human bone by reducing the strut diameter. The body-centered cubic (BCC) is superior to reinforced body-centered cubic (RBCC) in terms of the isotropy characteristics. The BCC unit implementing successfully interface connection of adjacent and different modulus lattice can be used to construct prosthesis of adjustable modulus, and the allowable range of elastic modulus is 15.9-100 GPa. The proposed method can be applied to build prosthesis with gradient modulus gradient in order to achieve the optimized stress distribution within the joints.