Abstract
Creep tests were conducted at 450°C with a mild steel of 0.14 percent carbon content for loading times up to 1000 hours under stepwise varying periodic stresses, and also under various constant stresses.From the results, it was found that, for constant stress tests, strain e at time t was well expressed, within the range of testing time, by the well known Andrade's equation where e0, β, κ and n were functions of stress σ. It was also ascertained in the varying stress tests that strain at given number of periods of stress wave was greater than the strain given under the constant stress of the same length of loading time, the magnitude of the stress being the same as the mean stress of the varying stress test, and that this tendency was much accelerated by the higher value of stress amplitude, although no appreciable effect was found of the magnitude of period of stress wave.The results of the varying stress tests were compared with the calculated results due to Mechanical Equation of State. It is concluded under the test conditions of the present report that the strain in the varying stress test may be predicted with an error not exceeding 10 percent, which is within the range of scatter of strain in the creep tests under a constant stress, by the use of mechanical equation of state and the results of constant stress creep tests.
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