The use of a tapered form of specimen for creep testingi s described. Strains are measured on a series of short gauge lengths, enabling a family of isothermal creep curves at different stresses to be obtained from a single test. The measurement of strain is by the replica method, but other methods are not necessarily excluded.
Testing of tapered specimens makes possible a considerable saving in the aggregate time and material necessary to establish a set of creep curves, with little sacrifice of accuracy. Data are presented for the aluminium alloy DTD 5070A, and results from tapered specimens compare favourably with creep curves obtained in conventional tests.
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References
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