Topic
Crack closure
About: Crack closure is a research topic. Over the lifetime, 28157 publications have been published within this topic receiving 588158 citations.
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TL;DR: In this article, a review of the different phenomena responsible for crack growth in the IN718 nickel-base superalloy under the combination of fatigue, creep and oxidation is presented.
122 citations
TL;DR: In this article, a simple model for the demarcation of the initiation and stage I fatigue crack growth phases is introduced, and experimental cumulative damage data are used to determine the phase boundary between these two regimes, and an exponential accumulation of damage theory is invoked for each; here, damage is equated to crack length.
Abstract: A simple model for the demarcation of the initiation and stage I fatigue crack growth phases is introduced. Experimental cumulative damage data are used to determine the phase boundary between these two regimes, and an exponential accumulation of damage theory is invoked for each; here, damage is equated to crack length. Using both the model and the data, predictions are made of lifetime in double, treble and multilevel strain range tests. The theory successfully accounts for the load sequence effect, which is a consequence of the initiation period, and the effect of the difference between successive strain range levels. It is suggested that the Palmgren-Miner expression be replaced by individual expressions for the accumulation of damage in the separate phases of initiation and stages I and II fatigue crack propagation.
122 citations
TL;DR: In this paper, the influence of base plate heating and post-process stress-relief on part properties like process-incited defects, which are critical for fatigue loading, for AlSi12 alloy was investigated.
122 citations
TL;DR: Using dislocation pileup theory, a model was given for the prediction of crack initiation life under contact fatigue in this paper, where the sliding contact boundary condition was introduced to explain how a surface crack can be initiated.
Abstract: Using dislocation pileup theory, a model is givenfor the prediction of crack initiation life under contact fatigue. Near surface crack initiation is investigated by introducing the sliding contact boundary condition. Crack initiation originated at the surface and substrate are treated as extreme cases. The new model physically explains how a surface crack can be initiated and shows that the surface crack initiation life should be shorter than the subsurface crack initiation life under the same stress amplitude conditions. A discussion is given about the influence of residual stress, hardness, temperature, irreversibility of the plastic deformation, as well as other parameters that affect the crack initiation life
122 citations
01 Jan 1983
122 citations