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Compression‐compression fatigue of selective electron beam melted cellular titanium (Ti‐6Al‐4V)
Author(s) -
Hrabe Nikolas W.,
Heinl Peter,
Flinn Brian,
Körner Carolin,
Bordia Rajendra K.
Publication year - 2011
Publication title -
journal of biomedical materials research part b: applied biomaterials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.665
H-Index - 108
eISSN - 1552-4981
pISSN - 1552-4973
DOI - 10.1002/jbm.b.31901
Subject(s) - compression (physics) , materials science , titanium , titanium alloy , cathode ray , composite material , electron , metallurgy , alloy , physics , quantum mechanics
Regular 3D periodic porous Ti‐6Al‐4V structures intended to reduce the effects of stress shielding in load‐bearing bone replacement implants (e.g., hip stems) were fabricated over a range of relative densities (0.17–0.40) and pore sizes (∼500–1500 μm) using selective electron beam melting (EBM). Compression‐compression fatigue testing (15 Hz, R = 0.1) resulted in normalized fatigue strengths at 10 6 cycles ranging from 0.15 to 0.25, which is lower than the expected value of 0.4 for solid material of the same acicular α microstructure. The three possible reasons for this reduced fatigue lifetime are stress concentrations from closed porosity observed within struts, stress concentrations from observed strut surface features (sintered particles and texture lines), and microstructure (either acicular α or martensite) with less than optimal high‐cycle fatigue resistance. © 2011 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 2011.