Showing papers in "International Journal of Fatigue in 2003"

TL;DR: In this article, the effects of weld residual stress and heat affected zone on the fatigue propagation of cracks parallel and orthogonal to the weld direction in friction stir welded (FSW) 2024-T351 joints were investigated.

TL;DR: In this article, the authors compared the fatigue strength of friction stir (FS) welds with conventional arc-welding methods: MIG-pulse and TIG.

TL;DR: This article surveys the historical development of scientific and engineering knowledge about fatigue of materials and structures in the 20th century, including fatigue as a material phenomenon, prediction models for fatigue properties of structures, and load spectra.

TL;DR: In this paper, high cycle fatigue properties of high-pressure die-cast magnesium alloys AZ91hp, AM60hp, AE42hp, AS21hp and of similarly produced cast aluminium alloy AlSi9Cu3 were investigated.

TL;DR: In this article, the authors explore the deformation mechanisms controlling the ambient temperature dwell sensitive fatigue in titanium alloys and highlight the important issues for consideration during the design and service of future aerospace components and alternative high performance applications.

TL;DR: In this article, a study on near-threshold fatigue crack growth in friction stir welded aluminum alloy 7050-T7451 and a titanium alloy Ti-6Al-4V is presented.

TL;DR: In this article, two post-weld treatments, UIT and shot peening, are involved in the present study, and the experimental conditions and the results of these stress measurements are presented.

TL;DR: In this article, the root flaws up to a certain size are tolerable without a significant loss in performance when compared to nominally flaw-free welds, and even friction stir welds with root flaws exceed the design life for equivalent fusion welds set out in the draft Eurocode 9.

TL;DR: In this article, the S-N curve in the gigacycle regime was determined in order to guarantee the real fatigue strength and safe life of mechanical components, and the state of the art in this field is summarized through their own results.

TL;DR: In this paper, a threshold for fatigue crack propagation as a function of crack length is defined from a depth given by the position d of the strongest microstructural barrier to crack propagation, which defines the plain fatigue limit.

TL;DR: In this paper, the authors investigated the growth behavior of fatigue cracks initiated at corrosion pits in laboratory coupons of 7075-T6511 aluminium alloy subjected to a transport aircraft loading spectrum.

TL;DR: In this paper, a two-dimensional micromechanical approach based on crystal plasticity was used to assess the degree of heterogeneity of cyclic plastic deformation for cyclic loading below the yield point among large sets of grains in a single phase polycrystal.

TL;DR: In this article, a review of methods and corresponding Codes and Standards for the fatigue assessment of welded aluminium alloy structures is presented from the viewpoint of original design and estimation of the residual life of existing structures.

TL;DR: In this article, Cavitation shotless peening (CSP) is used to improve the fatigue strength of carbonized chrome-molybdenum alloy steel (JIS SCM415) with respect to processing times, residual stress and cyclic-stress curves.

TL;DR: In this article, the effects of surface roughness on crack initiation mechanism and associated step-wise S-N characteristics were studied, and a fish-eye was always observed in subsurface crack initiation.

TL;DR: In this paper, the authors proposed a new theory of fatigue crack growth in ductile solids based on the total plastic energy dissipation per cycle ahead of the crack, and the fundamental hypothesis of the theory proposes a unified criterion for crack extension under monotonic and fatigue loading.

TL;DR: In this paper, a study of the fatigue behavior of the AISI-SAE 52100 between 105 and 1011 cycles was performed on a piezoelectric system built in our laboratory.

TL;DR: In this paper, a fatigue crack growth threshold test procedure is experimentally validated that does not produce load history effects and can be conducted at a specified stress ratio, R. da/dN.

TL;DR: In this article, ultrasonic impact treatment (UIT) was used to enhance the fatigue resistance of welded transverse stiffeners and cover plate details in 18 full-scale W27×129 rolled beam specimens.

TL;DR: In this article, two micro-mechanical models for notch sensitivity and fatigue life allowed the development of boundary conditions that would evaluate potential life improvement after controlled shot peening (CSP) in high strength aluminium alloys.

TL;DR: In this paper, different methods and procedures exist for the computation of the structural hot-spot stress at welded joints, either based on the extrapolation of stresses at certain reference points on the plate surface (or edge) close to the weld toe, or on the linearization of stresses in the through-thickness direction.

TL;DR: In this article, the influence of weld tool travel speed on the occurrence of "onion-skin" forging-type defects in single pass friction stir (SP FS) welds was investigated.

TL;DR: In this article, the concept of volume influencing fatigue crack initiation proposed by Palin-Luc and Lasserre with an energy-based approach is presented, based on the strain-work density given to the material, which is usable for in and out-of-phase combined loadings, with or without mean stress.

TL;DR: In this paper, the authors performed torsion fatigue tests on a quenched and tempered steel, commonly employed in highly stressed mechanical components, with different levels of superimposed mean shear stress.

TL;DR: In this article, the effects of impact angle, leading edge radius, and blade wedge angle on fatigue strength were investigated and it was shown that damage depth has a significant effect on the fatigue strength.

TL;DR: In this article, the authors examined the fatigue properties of laser beam welded thin sheet aluminium and found that the cyclic strength of overlap joints with a slot weld is characterized by a two-dimensional crack-like notch between the sheets.

TL;DR: In this paper, the authors examined the crack growth behavior of structural steels by using the Unified Approach developed by the authors in this approach, fatigue requires two load parameters involving maximum stress intensity, Kmax, and stress intensity amplitude, △K For a fatigue crack to grow, both Kmax and △ K must exceed their respective threshold values Similarly, for any other crack growth rate, two limiting values, KMAX∗ and K�K∗ are required to enforce the growth rate The variation of these two critical values forms the crack trajectory map, which is defined by plotting

TL;DR: In this paper, the true surface relief corresponding to persistent slip markings emerging from persistent slip bands on fatigued polycrystalline austenitic and ferritic stainless steels was found.

TL;DR: A method is presented that facilitates the development of accurate statistical strain–life curves given experimental data from strain controlled uni-axial fatigue tests and incorporates a method based on the approximate Owen tolerance limit to account for the nature of scatter fatigue data.

TL;DR: In this paper, an assessment of the effects of microstructure and operating parameters on both crack initiation and propagation of short fatigue cracks is presented, and the assessment was carried out on RR1000, U720Li and microstructural variants of U 720Li.