Showing papers in "International Journal of Fatigue in 2002"

TL;DR: In this paper, the current status of research and development on laser shock processing of metals, also known as laser peening, using Q-switched high power lasers is reviewed and the influence of processing parameters on the laser-induced shock waves in metal components are discussed and analyzed.

TL;DR: In this article, the authors evaluated the fatigue life of AISI 4340 steel, used in landing gear, under four shot peening conditions and found that relaxation of the residual stress field occurred due to the fatigue process.

TL;DR: This paper reviews analysis approaches that are currently available for predicting fatigue life in rubber and both crack nucleation and crack growth approaches are considered.

TL;DR: In this paper, the effect of inclusions on crack initiation and propagation in gigacycle fatigue was investigated experimentally and analytically in six high strength low alloy steels.

TL;DR: In this paper, the Risitano method is used to determine the fatigue limit of a material and its components, and a procedure for the definition of the whole fatigue curve is presented.

TL;DR: In this paper, the effects of surface texture on the fatigue life of a high-strength low-alloy steel were evaluated in terms of the apparent fatigue stress concentration using the Neuber rule and Arola-Ramulu model.

TL;DR: In this paper, an experimental and analytical study of the effect of varying contact stress fields on the initiation life of fretted specimens is conducted for two high strength alloys commonly used in the aerospace industry, namely Al4%Cu and Ti-6Al-4V.

TL;DR: In this paper, the change in the modulus of elasticity due to fatigue damage is studied for uni-axial bending, and a coupled approach of residual stiffness and strength is capable of simulating the three stages of stiffness degradation: initial decline, gradual reduction and final failure.

TL;DR: In this article, low cycle fatigue (LCF) behavior of a modified 9Cr-1Mo steel alloy under normalized and tempered conditions is reported, where the alloy was normalized at 1313k for 1 h followed by tempering at 1033k for one hour, resulting in a tempered martensitic structure.

TL;DR: In this paper, the relationship between fatigue assessment and counting methods is investigated by establishing when, in frequency domain analysis, analytical solutions of expected damage are connected with a counting procedure assumption and how this is related to the rainflow counting procedure.

TL;DR: In this article, the authors consider the prediction of high-cycle fatigue behavior in welded joints and apply the extension of the same theories to cover welded joint joints, showing the effect of reinforcement shape on butt welds and the fatigue strengths of non-load-carrying cruciform fillet welds.

TL;DR: In this article, the effect of different surface treatments on the fatigue behavior at the tooth root of spur gears is investigated and the residual stress profiles were measured at the root by means of the XRD technique and carefully analyzed in order to find a correlation with the measured fatigue properties.

TL;DR: In this paper, an axisymetric hourglass shape specimen (D=25 mm) is proposed to test the fatigue strength of rubber and a finite element simulation of stresses and strains is presented in order to get a better explanation of the experimental results.

TL;DR: In this paper, a brief description of the efforts taken especially by the German automotive industry and its cooperating research institutes to improve the accuracy of life time prediction and to optimise the proof-out by usage of experimental and numerical procedures is given.

TL;DR: In this article, the cyclic equivalent stress and strain amplitudes can be fitted by the Ramberg-Osgood relationship to estimate uniaxial and torsional fatigue.

TL;DR: In this article, the influence of casting defects on static and fatigue strength for a high pressure die cast aluminium alloy was investigated for three batches of specimens, differing for the sprue-runner design, while no significant variation in the fatigue strength was observed when looking at batches of acceptable and non-acceptable components, as judged within the foundry quality control.

TL;DR: In this article, a cumulative fatigue damage model was proposed to predict an extremely low cycle fatigue (ELCF) life for annealed low carbon steel of S20C, based on the concept that the damage due to ductility exhaustion should be considered besides the damage generated by crack propagation in the ELCF regime.

TL;DR: In this article, the effect of complex stress states is not properly taken into account in determining operational life and fatigue response in general, due either to misconceptions or lack of experimental data and theoretical models.

TL;DR: In this paper, the stresses and strains at the notch of a spot weld nugget were studied in detail and a fatigue life prediction method based on strain was proposed, which showed that a strain-based approach does a good job of describing the fatigue life of mixed-thickness spot welds.

TL;DR: In this paper, a computational model for determination of service life of gears in regard to bending fatigue in a gear tooth root is presented, where the fatigue process leading to tooth breakage is divided into crack initiation and crack propagation period.

TL;DR: In this article, Artificial Neural Network Back-propagation (ANN) was used to predict the behavior of fracture toughness and tensile strength as a function of microstructure.

TL;DR: In this paper, a non-contacting, digital-image measurement system has been developed to measure the displacement of the specimen gage length during a cyclic loading, and the capability of this system for strain-controlled fatigue testing was studied in preliminary experiments.

TL;DR: In this article, a methodology for observation and modeling of microscopic damage evolution in quasi-isotropic composite laminates is presented, based on the damage observation using both an optical microscope and a soft X-ray radiography, a damage mechanics analysis is conducted to formulate the stiffness change due to transverse cracking.

TL;DR: In this paper, low cycle fatigue tests of as-casted Sn-Pb eutectic solder (63Sn/37Pb) were carried out using the non-contact strain controlled system at 20°C.

TL;DR: In this article, a non-linear cumulative damage model is developed for laminated carbon/epoxy composites under static and fatigue loading. But the range of validity of the model described here is limited to the first intra-laminar macro-crack, and it does not account for the delamination processes.

TL;DR: In this paper, a study of delamination growth in HTA/6376C carbon fiber/epoxy laminates was conducted under static and fatigue loading at both ambient conditions and elevated temperature.

TL;DR: In this paper, a series of fatigue tests were conducted on SNCM630 steel under irregular axial-torsional loading, and the energy-based parameters PHC and VF were evaluated using test data.

TL;DR: In this paper, a cross-ply laminate was used as a model material and the effect of block sequence on the lifetimes of carbon fiber/epoxy crossply laminates was investigated.

TL;DR: In this paper, the main topic of the present investigation is the verification of the Masing and memory behaviours of magnesium alloys, which are necessary for the component design by the local strain concept.

TL;DR: In this article, the fatigue impact of material defects under rolling contact loading, with emphasis on wheel/rail contact, was studied using numerical finite element (FE) simulations, and the authors found that a combination of defect clusters and occasional overloads is a plausible explanation to the initiation of deep subsurface fatigue cracks.