Department of Mechanical and Mechatronics Engineering, University of Waterloo, Waterloo, Ontario, Canada.
Acta Biomater. 2011 Apr;7(4):1788-96. doi: 10.1016/j.actbio.2010.12.017. Epub 2010 Dec 23.
This study addresses the mechanical properties of calcium polyphosphate (CPP) structures formed by stacked layers using a powder-based solid freeform fabrication (SFF) technique. The mechanical properties of the 35% porous structures were characterized by uniaxial compression testing for compressive strength determination and diametral compression testing to determine tensile strength. Fracture cleavage surfaces were analyzed using scanning electron microscopy. The effects of the fabrication process on the microarchitecture of the CPP samples were also investigated. Results suggest that the orientation of the stacked layers has a substantial influence on the mechanical behavior of the SFF-made CPP samples. The samples with layers stacked parallel to the mechanical compressive load are 48% stronger than those with the layers stacked perpendicular to the load. However, the samples with different stacking orientations are not significantly different in tensile strength. The observed anisotropic mechanical properties were analyzed based on the physical microstructural properties of the CPP structures.
本研究采用粉末基立体光固化成型（SFF）技术，研究了堆叠层状的多聚磷酸钙（CPP）结构的力学性能。通过单轴压缩试验测定了 35%多孔结构的抗压强度，通过径轴向压缩试验测定了拉伸强度。利用扫描电子显微镜分析了断裂面的形貌。还研究了制造工艺对 CPP 样品微观结构的影响。结果表明，堆叠层的方向对 SFF 制造的 CPP 样品的力学行为有很大影响。与层叠方向垂直于机械压缩载荷的样品相比，层叠方向平行于机械压缩载荷的样品的强度高 48%。然而，不同层叠方向的样品在拉伸强度上没有显著差异。观察到的各向异性力学性能是基于 CPP 结构的物理微观结构特性进行分析的。
