Showing papers in "International Journal of Fatigue in 1998"

TL;DR: A comprehensive review of cumulative fatigue damage theories for metals and their alloys, emphasizing the approaches developed between the early 1970s to the early 1990s, can be found in this paper, where the authors grouped these theories into six categories: linear damage rules, nonlinear damage curve and two-stage linearization approaches; life curve modification methods; approaches based on crack growth concepts; continuum damage mechanics models; and energy-based theories.

TL;DR: In this paper, a static and a dynamic impact test using a single steel ball against a flat steel plate were carried out to clarify the mechanism of the creation of compressive residual stress by shot peening.

TL;DR: In this paper, the effect of non-metallic inclusions on fatigue properties of quenched and tempered 0.46% carbon steel (HV≅650) in super-long life fatigue range (107≤N≤5.0×108), tension-compression fatigue tests were carried out.

TL;DR: In this article, tension-tension, load-controlled fatigue results extending to over 100 000 cycles for electron-beam-evaporated copper are reported, fabricated as a single tensile coupon with hundreds of grains across the width but only one or few through the thickness supported on a silicon frame.

TL;DR: In this article, the authors presented a continuum damage mechanics-based approach that estimates cumulative fatigue damage, and predicts crack initiation from fundamental principles of thermodynamics and mechanics, assuming that fatigue damage prior to localization occurs close to a state of thermodynamic equilibrium.

TL;DR: In this paper, a continuum damage mechanics model based on the general thermodynamic framework advocated by Lemaitre and Chaboche for high cycle fatigue is presented. But the model does not consider the effect of mean stress in its damage evolution law.

TL;DR: In this paper, a probabilistic model was developed to predict the observed variability in the experimental fatigue lives from the measured distribution of inclusion sizes, which was used to model crack growth from a microstructurally sized defect (such as an inclusion).

TL;DR: In this article, the causes of failure of railway axles are reviewed and analyzed, and the results have been applied to improve axle manufacture and in-service inspection for railway vehicles.

TL;DR: In this article, the static and fatigue characteristics of AS4 carbon/PEEK (polyetheretherketone) APC-2 laminates were investigated, and the predicted fatigue strength by power law of the S-N relation agreed well with the measured data, i.e. the power law is satisfactorily acceptable.

TL;DR: In this paper, the fatigue growth of an edge flaw in a round bar under cyclic tension or bending loading is examined, using a two-parameter numerical model, and it is shown that the crack front evolution is defined by a very small number of parameters, which varies during crack growth.

TL;DR: In this article, the authors considered the strain energy density generated ahead of a fatigue crack as predicted by elastic and non-linear plastic theory and derived a simple expression for LEFM/EPFM crack growth, demonstrating how appropriate energy values may be obtained from low cycle fatigue (LCF) tests.

TL;DR: In this article, a path independent parameter for multiaxial fatigue damage is proposed based on the critical plane approach, where both parameters of shear strain and normal strain excursion are considered in this parameter.

TL;DR: Using continuum damage mechanics, a fatigue damage accumulation model related to ductility exhaustion has been developed in this article, which is applied to study fatigue damage evolution in a pressure vessel steel and two-level cyclic tests have been carried out to verify the model.

TL;DR: In this article, an extensive parametric study, using finite elements, of the stress concentration factors in tubular K-joints commonly found in offshore platforms is presented, which covers a comprehensive range of geometric joint parameters for unbalanced out-of-plane moment loading.

TL;DR: In this article, a theoretical formulation to predict fatigue strength and life in AS4 carbon/PEEK (polyetheretherketone) APC-2 laminates at various stress ratios was studied.

TL;DR: In this article, a general multi-modal Weibull distribution with the procedure of unknown parameter estimation is presented, which can be used for every stationary process and for any shape of loading spectrum.

TL;DR: In this paper, the authors defined the definition of fatigue crack initiation size and determining method were presented on the basis of the non-propagating cracks behaviour, and explained the physical significance of the initiation size from the point of view of the fatigue damage.

TL;DR: In this paper, it was shown that the effective fatigue threshold is uniquely correlated to the Young's modulus for a wide range of metallic and composite materials (ΔKth,eff=164·10−2·E) and that the crack closure level Kcl increases with increased roughness of the fracture surface H Kcl and H are quantitatively related via the equation K cl =12· H 1/3 for steels with widely different mechanical properties and grain sizes.

TL;DR: In this paper, a new method of the scatter of loading spectra prediction has been developed for predicting the endurance limit of a randomly loaded structural component, which is much more general than that of other existing methods, and extensive load measurements on a fork-lift at various operating conditions have been carried out.

TL;DR: In this article, the benefits of coldworking are discussed and the differences between the split-sleeve and split-minar coldworking methods are discussed. But, the benefits are not discussed in this paper.

TL;DR: In this article, the influence of laser hardening on plane bending fatigue behavior (R=−1) of a B-Mn SS2131 (∼AISI 15B21H) steel has been studied.

TL;DR: In this article, a neural network approach is developed to determine the crack opening load from differential displacement signal curves, which is applied in practical to constant amplitude loading tests and is found to provide good results.

TL;DR: In this article, the residual stress redistribution of a weldment during crack growth and its effect on the fatigue crack propagation were investigated. And the predicted crack growth rates were in good agreement with the experimental results, compared with those from the initial residual stress distribution.

TL;DR: In this article, a spur gear pair from the first stage of an industrial vehicle gear box has been subjected to experimental testing and the effects of different load distributions along the gear tooth width on the fatigue crack growth in gear tooth root were measured on an appropriate testing device.

TL;DR: In this article, a large amount of fatigue data from spectrum tests both on AW and post-weld treated welded joints has been obtained during two inter-Nordic projects.

TL;DR: In this article, the relationship between fatigue strength and highly stressed volume was investigated with various combinations of specimen configurations and loading modes for austempered ductile irons (ADIs) in different heat treatments.

TL;DR: In this article, a model to account for crack coalescence within particle clusters was developed to determine if particle clusters can be more damaging than single particles as crack nucleation sites, and the model showed that varying the initial separation between two particles (potential cracks) causes at most about a 15-20% change in fatigue life over a separation range of 5μm to 1200μm for a pair of 50μm 2 particles.

TL;DR: In this paper, the elasto-plastic stress distributions within straight and tapered bolt-nut connectors are studied by using the virtual contact loading method, based on a simplified axisymmetrical model.

TL;DR: In this article, the influence of different post welding treatments, such as ageing or shot peening, on the fatigue behavior of Al-alloy welded joints was investigated, and several four point bending fatigue tests were conducted on GMAW specimens subjected to different post weld treatments.

TL;DR: In this paper, the applicability of the notch strain approach to the assessment of the fatigue strength and service life of a K-shaped tubular joint is investigated, and the structural stresses in the hot spot area are calculated by the finite element method and compared with the results of relevant parametric formulae as well as of strain gauge measurements.