+ Visit NASA.gov + Contact NASA   + Home Collection > NASA  Author > Ellis, David L.  Author > Holmes, Richard  Author > Keller, Dennis A.  Author > Lerch, Bradley A.  Author > Yun, Hee Man  NASA Center > Glenn Research Center  Publication Year > 2001-2010 > 2001  Subject > M-O > Metals And Metallic Materials  Availability Options > Online > PDF  Item/Media Type > Technical Report  Note: Start a new navigation search by selecting a link above     Previous Record | Next Record + Back to Results   + Printer Friendly Title: GRCop-84 Developed for Rocket Engines Author(s): Ellis, David L.; Yun, Hee Man; Lerch, Bradley A.; Keller, Dennis A.; Holmes, Richard Abstract: GRCop-84 (Cu-8 at.% Cr-4 at.% Nb) was developed at the NASA Glenn Research Center for use in regeneratively cooled rocket engines. This alloy possesses an excellent combination of conductivity, thermal expansion, strength, creep resistance, ductility, and low-cycle fatigue (LCF) life. In comparison to the currently used alloy, NARloy-Z (Cu-3 wt % Ag-0.5 wt % Zr), GRCop-84's significantly better properties give it the potential for significant gains in engine performance and reliability. For GRCop-84 to be safely used in a rocket engine, it is critical to develop a detailed data base of the important thermophysical and mechanical properties. Work has focused on five major properties: thermal conductivity, thermal expansion, tensile strength, creep resistance, and LCF life. The analysis went beyond simply measuring the data and reporting averages. A detailed statistical analysis was conducted that allowed regression of the data over the entire temperature range tested and establishment of design minimums. The design values were expressed as simple mathematical formulas that are highly amenable to use in computer codes such as in finite element analysis and related computer modeling work. NASA Center: Glenn Research Center Publication Date: March 2001 Document Source: CASI Online Source: View PDF File Document ID: 20050196556 Publication Information: Research and Technology 2000, Number of Pages = 3 Price Code: A01 Related Information: See Document ID 20010048403 Keywords: ALLOYS; MECHANICAL PROPERTIES; ROCKET ENGINES; THERMOPHYSICAL PROPERTIES; FATIGUE LIFE; THERMAL EXPANSION; TENSILE STRENGTH; STATISTICAL ANALYSIS; FINITE ELEMENT METHOD; Accessibility: Unclassified; No Copyright; Unlimited; Publicly available; Updated/Added to NTRS: 2008-06-02 + Back to Top + Sponsored by the NASA Scientific and Technical    Information Program + 2004 Vision for Space Exploration + Freedom of Information Act + NASA Web Privacy Policy and Important Notices + NASA Disclaimers, Copyright Notice,    and Terms and Conditions of Use NASA Official: Calvin Mackey Page Curator: NASA Center for AeroSpace Information (help@sti.nasa.gov) Last Updated: July 5, 2007