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Published on: November 30, 2017
Part II: fracture strength and elastic modulus as a function of porosity for hydroxyapatite and other brittle
1Chemical Engineering and Materials Science Department, Michigan State University, East Lansing, MI 48824, United States.
Abstract:
Part I of this paper discussed the Weibull modulus m, versus porosity P behavior of brittle materials, including HA. While the Weibull modulus m deals with the scatter in fracture strength data, this paper (Part II) focuses on two additional key mechanical properties of porous materials, namely the average fracture strength <σ(f)>, and Young's modulus E, for P in the interval from P≈ zero to P≈P(G) (the porosity of the unfired compacts). The <σ(f)> versus P data for HA from this study and the literature data for alumina, yttria stabilized zirconia (YSZ) and silicon nitride are described well by functions of ϕ, where ϕ=1-P/P(G)= the degree of densification. A similar function of ϕ applies to the
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