Abstract
This paper deals with the influence of both defect and loading sequence on fatigue damage accumulation of C35 steel containing artificial defects. Tests were carried out using fatigue samples with artificial spherical defects introduced at the surface. Tests were performed using two blocks loading under increasing and decreasing magnitude. The experimental results were compared to the damage calculated by the Miner rule. In the case of defective material; it is shown in both cases a minor influence of sequence’s effect. A lifetime prediction method is then developed to assess the residual lifetime of damaged defective material. The method is based on a multiaxial endurance criterion used to calculate the equivalent local stress distribution around the defect and to inject it in an uniaxial damage cumulative rule. Finally a comparison between experimental and theoretical results is performed. It is observed that the Mesmacque sequential law gives the most accurate lifetime prediction of defective specimens.
Highlights
Several approaches have been proposed to determine fatigue behavior of material with introduced defect [1]. The effect of these defects on fatigue behavior has usually been evaluated by constant amplitude stress-life fatigue tests
Most engineering components are subjected to variable amplitude cyclic load
On the other hand different relationships have been proposed to estimate the effect of variable amplitude loading conditions on lifetime prediction, but only in the case of free defect material [2, 3, 4]
Summary
Several approaches have been proposed to determine fatigue behavior of material with introduced defect [1]. The effect of these defects on fatigue behavior has usually been evaluated by constant amplitude stress-life fatigue tests. Most engineering components are subjected to variable amplitude cyclic load. On the other hand different relationships have been proposed to estimate the effect of variable amplitude loading conditions on lifetime prediction, but only in the case of free defect material [2, 3, 4]. The present study deals with defective material. The objective is to study the influence of both defect and loading sequence on fatigue damage accumulation. The residual lifetime assessment is the most appropriate mean to reveal the effect of both defect and loading sequences
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