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Introduction to a Library of Creep and Strain Recovery Data for DTD 5070A Aluminium Alloy.

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This paper introduces the library of tensile creep data accumulated during a research programme carried out by Structures Department during the period January 1969 to March 1976. Specimens were cut from a single sheet of high strength aluminum alloy to DTD 5070A and were creep tested at 150, 165, 180 and 195 C over a range of stress levels to strains near rupture. Subsequent unloading, where possible, provided strain recovery data. Additional tests investigating the interaction of creep and strain recovery periods were extended in some cases to provide cyclic creep data useful in the exploration of history effects. Further work, mainly at 180 C, investigated the effects of periods of prior heating and of step changes in load level. The data were obtained under conditions of temperature, load and load axiality controlled more closely than is usual in conventional creep testing and can be compared with some confidence. In addition each test phase was fitted with a seven degree polynomial to high accuracy and processed data was produced listing time, measured and fitted strain, strain rate and second derivative of strain with respect to time together with the appropriate polynomial coefficients. This report details the techniques used, describes the results in a qualitative manner and acts as an index to the library of processed data which is available in microfiche form in a companion report. Author

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  • Metallurgy and Metallography
  • Mechanics

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