Showing papers in "International Journal of Fatigue in 1997"

TL;DR: In this paper, the authors provide a concise assessment of some commonly used high-cycle fatigue criteria and check their predictive capabilities against synchronous out-of-phase bending and torsion experimental results.

TL;DR: In this article, the ambient temperature fatigue performance of the near alpha titanium alloy IMI834 was evaluated using laboratory specimens manufactured from two material sources: rolled bar stock and an isothermally forged compressor disc.

TL;DR: In this paper, the fatigue characteristics of two cellular foam core materials as used in load carrying sandwich structures were investigated and a thorough investigation was performed on the behaviour of fatigue crack formation and growth.

TL;DR: In this article, the initiation and propagation of fatigue cracks on plates in a deep drawing steel and in a cast aluminium alloy were characterized by lateral V and U-shape symmetric notches, with a notch root radius ranging from 0.1 to 10 mm, the notch depth being 10 mm and the plate thickness 2 mm for the steel and 5 mm for light alloy.

TL;DR: In this paper, the authors examined the fatigue behavior of a unidirectional composite lamina from theoretical and experimental viewpoints and established a technique to use experimental data to simulate the behavior of that ply in multiaxial fatigue loading.

TL;DR: In this paper, the S-N curves generated with and without fretting and subsequent analysis have been used to satisfy a number of objectives: (1) to establish the important variables which can significantly affect fretting fatigue behaviour; (2) to increase our fundamental understanding of the fretting fatigues process; and (3) to give a ranking of a diverse range of materials in terms of their resistance to fretts fatigue.

TL;DR: In this paper, a generalized residual material property degradation model is proposed to simulate the fatigue behavior of a unidirectional ply under multiaxial state of stress and arbitrary stress ratio.

TL;DR: In this article, an algorithm for performing rainflow cycle counting that enables a correct translation of the load sequence into damaging events is presented, and a flow chart is presented to enable integration of the algorithm into a fatigue crack growth model.

TL;DR: In this paper, a finite element study was performed of the driving forces of short cracks at inclusions in bearing steels exposed to rolling contact load and five inclusion configurations were considered, namely a pore, a manganese sulphide inclusion, a through-cracked alumina inclusion, an alumina which was uncracked but which could debond from the matrix and finally a titanium nitride inclusion.

TL;DR: In this paper, the impact of sub-surface core damage in sandwich beams subjected to fatigue loading using results from static and fatigue tests of undamaged beams is investigated using Weibull function.

TL;DR: In this paper, it is shown that the internal stresses decrease as a short crack grows out of the existing stress field, and the role of residual stresses and transformation induced internal stresses on the crack growth is discussed.

TL;DR: In this article, the effects of grain size on cyclic plasticity and fatigue crack initiation were evaluated on polycrystalline nickel of two grain sizes, 24 and 290μm.

TL;DR: In this article, a short crack growth mechanism and kinetics were studied under symmetrical push-pull straining in austenitic stainless 316L steel and two different regimes in short and long cracks were identified.

TL;DR: In this article, the authors discussed the application of Murakami-Endo's model to industrial components, dealing with variability of material properties and microstructure, residual stresses, methods for the research of defects, and attention was eventually focused on the statistical analysis of defects in order to obtain reliable estimates of maximum defects.

TL;DR: In this paper, the mechanisms of crack formation and its growth to the initiated crack at room temperature are reviewed in light of controlling microstructure and other metallurgical features, and recommendations are made for improving fatigue crack initiation resistance with consideration to practical limitations.

TL;DR: In this paper, the authors focused on the methods with special emphasis on practical fatigue reliability considerations, including quantitative structural fatigue ratings, which incorporate reliability considerations for test data reduction and fleet performance predictions.

TL;DR: In this article, a Paris type crack growth relation was employed as the basis of the simulating computations, and the shape of growing cracks was quantitatively examined by two measures: the relative residual and relative standard deviation, in order to reveal the shape difference between the numerically predicted crack profiles and the widely-assumed circular-arc shape.

TL;DR: A brief history of the evolution of this type of calculation software in the vehicular industry from the observation of stress-strain hysteresis behavior, through the early development of computer versions of the stress -strain shape and memory models, to their evolution into routines that are closely linked to vehicle dynamics models that calculate loads in structures, finite element models that transform the loads into local stresses, and subsequent plasticity correction and damage evaluation routines which yield expected life color contour plots for vehicle body and chassis.

TL;DR: In this article, a modification of this technique allowing the use of remote compliance measurements to account for crack tip strain below the K-opening load is suggested, where the redistribution of stresses associated with partially open cracks and the effect of this redistribution on the stress field in front of the crack cannot be determined simply on the basis of a change in the slope of the load-displacement curve.

TL;DR: In this paper, a variable amplitude strain history containing 62 672 reversals was scaled to various peak strain levels and used as full length histories and then edited, using both techniques, to the 90% and 50% damage retained levels which removed from 89 to 99.6% of the full length history.

TL;DR: In this paper, a two-parameter relationship of stress intensity factor, which accounts for the crack depth ratio and crack aspect ratio, has been determined using the compliance method, the loading spectrum of the shaft is calculated from monitoring deformations, and the fatigue crack growth is analyzed by employing a modified Forman model.

TL;DR: In this paper, the effect of microstructures on fatigue crack growth rates (FCGRs) in Ti-6Al-4V plates and laser welds was investigated, and the location of tensile fracture of laser-welded specimens was always in the base metal, owing to the presence of martensite in the narrow fusion zone.

TL;DR: In this paper, a maximum likelihood method for estimating PS-N curves is proposed in order to minimize the time and the number of specimens required for laboratory testing.

TL;DR: In this paper, the double linear damage rule (DLDRR) is used to predict the lifetime of a mission. But the double DLDRR does not consider mission loadings.

TL;DR: In this paper, a new creep-fatigue life prediction method has been developed in this paper to correlate high temperature low cycle fatigue (HTLCF) data on Cr-Mo steels within the premise that with the application of cyclic loading, which is plastic strain dominated under HTLCF conditions, damage accrues by means of viscous flow.

TL;DR: In this paper, two-dimensional analysis is used to calculate the service life of a gear with a crack in a tooth root, whereby the direction of maximum strain energy release rate G is sought.

TL;DR: In this paper, an engineering model which approximates the results of slip transfer calculations related to crack blockage by microstructure barriers is introduced, which is consistent with critical plane concepts for Stage I growth of small cracks, standard cyclic stress-strain and strain-life equations above threshold.

TL;DR: In this article, the role of microstructures on the two crack growth driving force parameters, K ∗ max and Δ k ∗ th, without invoking the extrinsic crack closure concepts, was analyzed.

TL;DR: In this article, a simple analytical description of the threshold behavior of materials is given, by which even quite complicated appearing ΔKth-R-curves can be represented by four constants, which can easily be determined.