Browsing by Subject "EB-PBF"
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Item An Investigation of the Fatigue Strength of Multiple Cellular Structures Fabricated by Electron Beam Powder Bed Fusion Additive Manufacturing Process(University of Texas at Austin, 2018) Orange, Abigail; Wu, Yan; Yang, LiIn this study multiple cellular structures, including the re-entrant auxetic, the octet-truss, and the BCC lattice, were evaluated for their relative performance of fatigue strength under compression-compression cyclic loading. Various design variations with different dimensions were fabricated via electron beam powder bed fusion (EB-PBF) additive manufacturing (AM) process and experimentally tested. Initial S-N based fatigue strength characterization with the BCC lattice shows significantly decreased fatigue strength of the cellular parts compared to the solid samples. Cross-design comparison were consequently carried out using constant maximum stress ratio level. The results indicate that the fatigue characteristics of the EB-PBF cellular structures are not only dependent on their topology types but also their geometry dimensions.Item Microstructural and Mechanical Characterization of Ti6Al4V Cellular Struts Fabricated by Electron Beam Powder Bed Fusion Additive Manufacturing(University of Texas at Austin, 2018) Ewing, Cody; Wu, Yan; Yang, LiDespite the widespread use of the electron beam powder bed fusion (EB-PBF) additive manufacturing (AM) process in the fabrication of cellular structures, relatively little is known about the microstructural and mechanical properties of the individual cellular struts of different geometries fabricated by the EB-PBF. In this study, experimental investigation was carried out in the attempt to establish preliminary understanding of the material characteristics of the Ti6Al4V cellular struts using EB-PBF under various geometry design conditions (dimension and orientation angle). It was found that there exist significant geometry effects for the material characteristics of the Ti6Al4V cellular struts, which indicates that a non-uniform material model should be considered in the future design of these cellular structures.