Journal ArticleDOI
The physics of fatigue crack initiation
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TLDR
In this paper, the authors focus on experimental observations of strain localization and the theory and numerical analysis of both slip irreversibilities and low energy configuration defect structures, which are the early signs of damage during cyclic loading.About:
This article is published in International Journal of Fatigue.The article was published on 2013-12-01. It has received 495 citations till now. The article focuses on the topics: Crack closure & Slip (materials science).read more
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Dynamic evolution of off-fault medium during an earthquake: a micromechanics based model
Marion Y. Thomas,Harsha S. Bhat +1 more
TL;DR: In this paper, a micromechanics based constitutive model was proposed to account for the dynamic evolution of elastic moduli at high-strain rates in a 2D in-plane model with a 1-D right lateral fault featuring slip-weakening friction law.
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Enhancement in fatigue performance of metastable austenitic stainless steel through directed energy deposition additive manufacturing
TL;DR: In this paper, the effect of the as-built microstructure and defect distribution on the fatigue performance of a metastable austenitic stainless-steel fabricated by directed energy deposition was analyzed in two fatigue regimes.
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Strain localization in Ti-6Al-4V Widmanstätten microstructures produced by additive manufacturing
Todd A. Book,Michael D. Sangid +1 more
TL;DR: In this paper, the impact of microstructural variations in Direct Metal Laser Sintering (DMLS) produced Ti-6Al-4V on strain localization was investigated through high resolution digital image correlation as a result of monotonic and cyclic loading for both stress relieved and mill annealed specimens.
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Experimental investigation of laser peening on Ti17 titanium alloy for rotor blade applications
TL;DR: In this article, a laser peening experiment was conducted to investigate the fatigue life of Ti17 titanium alloy by using Nd:YAG laser system with the pulse-width of 15 ns and max pulse-energy of 7 J.
Journal ArticleDOI
Deformation compatibility in a single crystalline Ni superalloy
TL;DR: The results show a clear demonstration of the capabilities of these techniques, found within the experimental toolbox, to underpin fundamental mechanistic studies of deformation in polycrystalline materials and the role of microstructure.
References
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Journal ArticleDOI
The Phenomena of Rupture and Flow in Solids
TL;DR: In this article, the authors investigated the effect of surface scratches on the mechanical strength of solids, and some general conclusions were reached which appear to have a direct bearing on the problem of rupture, from an engineering standpoint, and also on the larger question of the nature of intermolecular cohesion.
Book
Metal fatigue in engineering
R. I. Stephens,H. O. Fuchs +1 more
TL;DR: In this paper, the authors present methods proven successful in practice, such as safe-life, fail-safe, forecasting of service reliability, monitoring, and inspection; macroscopic and microscopic aspects of fatigue behavior; principles for determining fatigue crack growth and final fracture; scatter of data and statistical methods; environmental factors; and fatigue of joints and compounds.
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The structure of high-angle grain boundaries
TL;DR: In this paper, a superimposed dislocation network is proposed for the cubic system, which is a natural extension of previous dislocation models and models based on coincidence relationships, and explains many of the observed properties of grain boundaries.
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Ductile versus brittle behaviour of crystals
James R. Rice,Robb Thomson +1 more
TL;DR: In this article, a necessary criterion for brittle fracture in crystals is established, in terms of the spontaneous emission of dislocations from an atomically sharp cleavage crack, and the stability of a sharp crack against emission of a blunting dislocation for a number of crystals and crystal types in two dimensions and the energy to form a stable loop of dislocation from the crack tip in three dimensions.
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Dislocation wall and cell structures and long-range internal stresses in deformed metal crystals
TL;DR: In this article, a simple model for single-slip and multiple-slink deformation is proposed, in which the crystal is considered as a composite consisting of hard dislocation walls of high local dislocation density which are separated by soft regions of low local dislocations density.