Analysis of the compressive behaviour of the three-dimensional printed porous titanium for dental implants using a modified cellular solid model

作者：Gagg Graham; Ghassemieh Elaheh^*; Wiria Florencia E

来源：Proceedings of the Institution of Mechanical Engineers - Part H: Journal of Engineering in Medicine , 2013, 227(9): 1020-1026.

DOI：10.1177/0954411913489802

• Cellular model
• porous titanium implant
• micro-computed tomography
• morphology
• compressive behaviour

A set of cylindrical porous titanium test samples were produced using the three-dimensional printing and sintering method with samples sintered at 900 degrees C, 1000 degrees C, 1100 degrees C, 1200 degrees C or 1300 degrees 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%26apos;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%26apos;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).

• 出版日期2013-9