The Structural Engineer > Archive > Volume 10 (1932) > Issues > Issue 1 > Creep Properties of Metals
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Creep Properties of Metals

Perhaps the most characteristic property of metals at high temperatures is their ability to flow or creep when under prolonged load, and it is because of that property that the stress necessary to cause fracture of a metal at high temperatures depends on its time of application. Table I illustrates the marked falling away in the stress required to cause fracture, the longer the stress is applied. In the case of nickel-chromium steel at 600°C and brass at 250ºC stresses less than one fortieth of the breaking strengths determined from ordinary tensile tests at 600°C and 250ºC respectively, cause creep of the order of 10-5 inch per inch per day. If, at the stresses given in the last column of Table I, the creep were continuous at 10-5 inch per inch per day a deformation of 1 inch in 100 inches would be produced in 1,000 days, or roughly three years. In many instances, therefore, even such low stresses as those cited are too high for working stresses. H J Tapsell

Author(s): Tapsell, H J