A two-scale model for predicting elastic properties of porous titanium formed with space-holders

作者：Niu Wenjuan^*; Gill Simon; Dong Hongbiao; Bai Chenguang

来源：Computational Materials Science, 2010, 50(1): 172-178.

DOI：10.1016/j.commatsci.2010.07.022

• Porous titanium
• Porosity
• Modulus
• Two-scale model
• Sintering

This study proposes a model for the effective Young's modulus of porous titanium produced by space-holder technique. Unlike conventional foams, it contains porosities at two scales: macro-pores formed by the space-holder and micro-pores formed by incomplete sintering of the titanium powder. The structure of the porous body is therefore defined in terms of two state parameters: the relative density at the macro- and micro-scale. It is proposed that the interaction between the two scales is small, and models of each type of porosity are developed separately. It is found that the micro-scale model is in good agreement with the experiment data, as it is expected to be less sensitive to random variations in the powder structure. The macro-model is found to under-estimate the effect of the pores arising from the space-holder, as the distribution of these tends to be highly variable in size, shape and spatial distribution.

• 出版日期2010-11
• 单位重庆大学