Zhai Yun, Zhong Tianyuan, Guo Shuangquan, Lin Sheng, Hui David, Ma Xiaowei
School of Mechanical Engineering, Dalian Jiaotong University, Dalian 116028, China.
State-Owned Chuanxi Machine Factory, Chengdu 611936, China.
Micromachines (Basel). 2025 May 31;16(6):673. doi: 10.3390/mi16060673.
Porous bone implants have been extensively studied, with gradient structures receiving increasing attention due to their superior compatibility with bone tissue. However, comparative studies between gradient and uniform structures remain relatively scarce. In this study, selective laser melting (SLM) technology was employed to fabricate a gradient composite Ti6Al4V humeral bone plate, utilizing rhombic dodecahedron and its derived structures as unit cells. By adjusting the porosity parameter range to 22.02-94.37% using the Ashby Gibson formula, the mechanical properties of the porous bone plate were analyzed by varying the porosity parameters and conducting compression tests. The experimental results show that after preparing and compressing the structure, the elastic modulus of the model is controlled between 0.09-5.43 GPa, and the maximum yield strength is 216.1 Mpa. The experimental results demonstrate that, under shear loading, the gradient structure generates stress from the center of mass, with the phenomenon becoming more pronounced as the number of struts aligned with the direction of the applied load increases. This results in the model exhibiting characteristics of good resilience on the outside and a certain degree of rigidity on the inside. Compared to non-gradient models, gradient structures are more effective in controlling the direction of force transmission. Moreover, the elastic modulus of the bone plate is closer to that of natural bone tissue. These findings provide valuable insights for further research into gradient structure models of other rod-shaped unit cells, highlighting the mechanical advantages of gradient structures over uniform ones.
多孔骨植入物已得到广泛研究，由于其与骨组织具有优异的相容性，梯度结构受到越来越多的关注。然而，梯度结构与均匀结构之间的比较研究仍然相对较少。在本研究中，采用选择性激光熔化（SLM）技术制造了一种梯度复合Ti6Al4V肱骨接骨板，利用菱形十二面体及其衍生结构作为单元胞。通过使用阿什比·吉布森公式将孔隙率参数范围调整为22.02 - 94.37%，通过改变孔隙率参数并进行压缩试验来分析多孔骨板的力学性能。实验结果表明，在制备并压缩该结构后，模型的弹性模量控制在0.09 - 5.43 GPa之间，最大屈服强度为216.1 Mpa。实验结果表明，在剪切载荷作用下，梯度结构从质心产生应力，随着与施加载荷方向对齐的支柱数量增加，这种现象变得更加明显。这导致模型在外部表现出良好的弹性，在内部表现出一定程度的刚性。与非梯度模型相比，梯度结构在控制力传递方向方面更有效。此外，接骨板的弹性模量更接近天然骨组织的弹性模量。这些发现为进一步研究其他杆状单元胞的梯度结构模型提供了有价值的见解，突出了梯度结构相对于均匀结构的力学优势。
