Abstract
Presently welded components subjected to fatigue loading are assessed using Palmgren-Miner’s law. A method of assessment of welded components subjected to fatigue loading based on the variation of residual strength during its fatigue life has been developed using fracture mechanics and plastic deformation theory. Palmgren-Miner’s procedure of assessing components cannot be directly compared with the residual strength method of assessment developed since the basic principles from which these assessment techniques are derived are different. In this paper a residual strength model of Palmgren-Miner’s law is developed using results of a study conducted for determining damage due to variable amplitude loading from constant amplitude residual strength curves and a method of failure of welded components subjected to fatigue proposed earlier. This residual strength model of Palmgren-Miner’s law allows comparison of present techniques of assessment with the residual strength method of assessment proposed.
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