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Degree

Master of Sciences (Engineering), Case Western Reserve University, EMC - Mechanical Engineering, 2010.

Abstract

High Strength Low Alloy steel, grade 65 (HSLA-65) plates used by the US Navy for ship building are to be joined by Friction Stir Welding (FSW) which subjects the work-piece material to high strain rates at high temperatures. The strength of materials varies with the strain-rate and temperature to which they are subjected. Development of constitutive models to get the optimum FSW weld parameters requires experimental determination of the dynamic behaviour of a material at different strain-rates and temperatures. In the current study, experiments using the Split Hopkinson Pressure Bar (SHPB) were conducted on HSLA-65 at high temperatures to generate the true stress-strain curves in compression. In addition, two other materials, which are used in practical applications where high strain rate loading occurs at high temperatures, namely Inconel-718 superalloy (precipitation hardened and annealed) and Aluminum alloy 7075-T6 were also tested using the SHPB.

Subject Headings

Engineering; Experiments; Mechanical engineering; Mechanics; Metallurgy

Keywords

Dynamic compressive response of HSLA-65 steel at high temperature; Dynamic compressive response of Inconel-718 at high temperature; High temperature SHPB experiments

Committee / Advisors

Vikas Prakash (Advisor)
John Lewandowski (Advisor)
Joseph Mansour (Committee Member)

Pages

150p.

Document number: case1268337193
Permalink: http://rave.ohiolink.edu/etdc/view?acc_num=case1268337193

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