Abstract
The effect of two step stress variation and intermittent loading on the creep behaviour of commercially pure aluminium and stainless steel has been investigated. In the two step stress variation, the first stress σ 1 was applied for a given time t 1 and the stress level was switched over to σ 2. The resultant creep rate ≐ s2 + and the failure time t 2 have been observed. Under the intermittent loading programme, the stress cycle was applied in the order σ 1-zero- σ 1 and the average creep rate on each reloading has been observed. The experimental data appear to give a cumulative damage rule in the form t 1 t r1 + t 2 t r2 e ̇ s2 + e ̇ s2 =1 where t r is the creep rupture time corresponding to a given stress and ≐ s2 is the creep rate under the second stress in normal creep.
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