Behaviour of Aluminium in Uniaxial Stress Cycling
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概要
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When metals are subjected to cyclic stress a progressive deformation-termed cyclic creep-may occur from cycle to cycle. This phenomenon can be observed when the strains are produced by uniaxial cyclic stress. The conditions which produce a maximum rate of cyclic creep are of interest when the problem of producing continuous plastic deformation at room temperature without intermediate annealing process is being considered. Step tests on an annealed aluminium specimen cycled at a fixed stress range but with various levels of mean stress demonstrated the existence of an optimum condition for producing progressive deformation by cyclic creep. In the case investigated this occurred when the mean stress was about 20% of the stress range. The rate of cyclic creep is very sensitive to minute changes in the stress limits. The apparatus used in the present tests permitted adjustments, to be made in the level of mean stress while retaining the original value of stress range unchanged. It is suggested that the cyclic step tests give results that are representative of those that could be obtained by cycling each of a series of specimens between fixed stress limits. The considerable practical difficulties encountered in tests on individual specimens are described. On these grounds the use of step tests on s single specimen are held to be justified-at least for use in a preliminary investigation of cyclic creep phenomena.
- 社団法人日本材料学会の論文
- 1974-01-15