NDLI: Electron beam freeform fabrication of titanium alloy gradient structures

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Electron beam freeform fabrication of titanium alloy gradient structures

Content Provider	NASA Technical Reports Server (NTRS)
Author	Gupta, Vipul K. Bird, Richard Keith Shenoy, Ravi N. Brice, Craig A. Newman, John A. Baughman, James M.
Copyright Year	2014
Description	Historically, the structural optimization of aerospace components has been done through geometric methods. A monolithic material is chosen based on the best compromise between the competing design limiting criteria. Then the structure is geometrically optimized to give the best overall performance using the single material chosen. Functionally graded materials offer the potential to further improve structural efficiency by allowing the material composition and/or microstructural features to spatially vary within a single structure. Thus, local properties could be tailored to the local design limiting criteria. Additive manufacturing techniques enable the fabrication of such graded materials and structures. This paper presents the results of a graded material study using two titanium alloys processed using electron beam freeform fabrication, an additive manufacturing process. The results show that the two alloys uniformly mix at various ratios and the resultant static tensile properties of the mixed alloys behave according to rule-of-mixtures. Additionally, the crack growth behavior across an abrupt change from one alloy to the other shows no discontinuity and the crack smoothly transitions from one crack growth regime into another.
File Size	497307
Page Count	20
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_20140010738
Archival Resource Key	ark:/13960/t6rz48d23
Language	English
Publisher Date	2014-07-01
Access Restriction	Open
Subject Keyword	Metals And Metallic Materials Structural Design Titanium Alloys Electron Beams Extensometers Functionally Gradient Materials Mathematical Models Manufacturing Periodic Variations Microstructure Tensile Properties Crack Propagation Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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