Gagg Graham, Ghassemieh Elaheh, Wiria Florencia E
Department of Mechanical Engineering, The University of Sheffield, Sheffield, UK.
Proc Inst Mech Eng H. 2013 Sep;227(9):1020-6. doi: 10.1177/0954411913489802. Epub 2013 Jun 26.
A set of cylindrical porous titanium test samples were produced using the three-dimensional printing and sintering method with samples sintered at 900 °C, 1000 °C, 1100 °C, 1200 °C or 1300 °C. Following compression testing, it was apparent that the stress-strain curves were similar in shape to the curves that represent cellular solids. This is despite a relative density twice as high as what is considered the threshold for defining a cellular solid. As final sintering temperature increased, the compressive behaviour developed from being elastic-brittle to elastic-plastic and while Young's modulus remained fairly constant in the region of 1.5 GPa, there was a corresponding increase in 0.2% proof stress of approximately 40-80 MPa. The cellular solid model consists of two equations that predict Young's modulus and yield or proof stress. By fitting to experimental data and consideration of porous morphology, appropriate changes to the geometry constants allow modification of the current models to predict with better accuracy the behaviour of porous materials with higher relative densities (lower porosity).
使用三维打印和烧结方法制备了一组圆柱形多孔钛测试样品，样品在900°C、1000°C、1100°C、1200°C或1300°C下烧结。压缩测试后发现，应力-应变曲线的形状与代表多孔固体的曲线相似。尽管相对密度是定义多孔固体阈值的两倍。随着最终烧结温度的升高，压缩行为从弹性脆性发展为弹塑性，虽然杨氏模量在1.5 GPa左右保持相当恒定，但0.2% 条件屈服应力相应增加了约40 - 80 MPa。多孔固体模型由两个预测杨氏模量和屈服或条件屈服应力的方程组成。通过拟合实验数据并考虑多孔形态，对几何常数进行适当更改，可以修改当前模型，以更准确地预测具有较高相对密度（较低孔隙率）的多孔材料的行为。
