FATIGUE CRACK GROWTH BEHAVIOUR OF METALLIC BIOMATERIALS IN A PHYSIOLOGICAL ENVIRONMENT |
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| Authors: | Masaki Nakajima Toshihiro Shimizu Toshitaka Kanamori & Keiro Tokaji |
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| Affiliation: | Department of Mechanical Engineering, Toyota College of Technology, 2-1 Eisei-cho, Toyota, Japan,;Graduate Student, Toyohashi University of Technology, 1-1 Tenpaku-cho Hibarigaoka, Toyohashi, Japan,;Department of Mechanical Engineering, Gifu University, 1-1 Yanagido, Gifu, Japan |
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| Abstract: | Fatigue crack propagation (FCP) in Ringer's solution has been studied on four metallic biomaterials, i.e. pure titanium (TP35H), stainless steel (SUS304), dual-phase stainless steel (SUS329J4L), and titanium alloy (Ti–6Al–4V). For TP35H and SUS329J4L, the crack growth characteristics in Ringer's solution were almost the same as those in room air in the entire ΔK region examined, and thus the effect of Ringer's solution was not observed. The crack growth rates of SUS304 were enhanced in Ringer's solution in the region of ΔK ≥ 25 MPa m as compared to room air, while below this ΔK level they were similar in both environments. Also in Ti–6Al–4V, similar crack growth behaviour in Ringer's solution was found. From the comparison among the da/dN–ΔK relationships of the four materials in Ringer's solution, TP35H exhibited the fastest growth rates and then Ti–6Al–4V, SUS304, SUS329J4L in the order of decreasing growth rate. On the contrary, if the data were plotted in terms of ΔKeff /E, Ti–6Al–4V and TP35H showed superior crack growth resistance to the stainless steels. |
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| Keywords: | Metallic biomaterials Fatigue crack propagation Ringer's solution Fatigue crack closure |
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