Showing papers in "International Journal of Fatigue in 1990"

TL;DR: In this paper, a new method was developed which allows the reduction of localized notch stresses in two-dimensional and three-dimensional elastic structures in a very effective way, with only a commercial finite-element code (the authors used ABAQUS) required.

TL;DR: In this article, a systematic study of stresses in tubular Y-and T-joints has been conducted in which nearly 900 thin-shell finite-element analyses were performed.

TL;DR: Methods are considered of reducing a non-random fatigue loading history to a concise description and then of reconstructing a time history similar to the original, using a rainflow cycle counting matrix.

TL;DR: In this article, the load interaction effect of large stress cycles on the fatigue behavior of subsequent smaller cycles was investigated on an aluminium alloy and the results indicated that small cycles, including those below the constant-amplitude fatigue limit, can contribute significantly to damage accumulation, and therefore small cycles should not be ignored when predicting fatigue lives.

TL;DR: In this paper, stress-and strain-controlled push-pull tests have been performed to study fatigue phenomena in several plain carbon steels and a low-alloyed steel after different heat treatments with special consideration being given to the microstructural processes.

TL;DR: In this article, the relative proportions of through-thickness bending and membrane stresses in tubular Y-and T-joints have been investigated by analyzing a large number of thin-shell finite-element models.

TL;DR: In this paper, an experimental and theoretical investigation of surface crack growth in 28 mm thick steel plates loaded in pure bending was carried out, and good agreement between the experimental and predicted crack growth and crack shape development was obtained.

TL;DR: In this paper, a comprehensive thin-shell finite-element study has been conducted of stresses in tubular Y-and T-joints with a wide range of geometric ratios and subject to axial, in-plane and out-of-plane loading.

TL;DR: In this paper, the safe inspection intervals (SII) for AM-355 martensitic stainless-steel compressor discs from an aeroengine were calculated using probabilistic fracture mechanics (PFM) principles.

TL;DR: In this paper, the variation in damage accumulation rates which occur when periodic tension-compression and compression-tension overloads are introduced into an otherwise constant-amplitude loading history are examined.

TL;DR: In this article, a finite-element method was used to calculate elastic stresses around spherical internal inclusions and semispherical surface inclusions, and the implications of the finite element calculations on initiation and the early growth of fatigue cracks were discussed.

TL;DR: In this article, the fitted parameters in the Paris law for fatigue crack growth are considered, drawing on recent compendiums of sources of these parameters, representative values and their distributions are obtained.

TL;DR: In this paper, a multiaxial fatigue failure of welded coupling flanges of stirrers in a fertilizer plant required an investigation of the reasons for the failures and the development of an improved design.

TL;DR: In this paper, the effects of primary carbides, strength and toughness on fatigue crack growth behavior are discussed, in relation to the importance of static-mode cracking in aeroengine bearing operations.

TL;DR: In this article, the effects of austempering temperature and isothermal transformation time on the low-cycle fatigue (LCF) behavior in ductile irons have been studied and the fracture surfaces were observed by a scanning electron microscope in order to understand the fracture mechanism of LCF.

TL;DR: In this paper, the effects of the stress ratio on fatigue crack propagation under plane strain conditions are evaluated by load-shedding tests and closure measurements for stress ratios (R = K min K max ) of 0.2, 0.35,0.5 and 0.7.

TL;DR: In this paper, a method to calculate the fatigue life under wideband random loading is presented, where the total lifetime is assumed to be the summation of nucleation and crack propagation lives.

TL;DR: In this paper, the effect of flight sequence and marker loads on fatigue crack propagation was studied under random flight simulation loadings and two types of programmed flight sequences on 2024-T3 specimens.

TL;DR: In this article, a method to estimate the reliability of structural components by taking the time-variant properties of the structural resistance into account is presented, which is described by a bivariate diffusive surface crack growth model, and the probability density function of the crack growth is derived by solving a Fokker-Planck-type equation.

TL;DR: In this paper, the effect of high-frequency components in the power spectral density (PSD) of the loading process on the fatigue life of welded steel specimens has been investigated.

TL;DR: In this article, a stochastic model applying the Wheeler retardation concept for assessment of the fatigue crack lifetime under random overloads is presented, which is a variant of an earlier one, based on representation of the delay time due to retardation effects as a purely discontinuous Markov process.

TL;DR: In this article, an interferometric method was applied to whole-field measurement of in-plane surface displacements adjacent to fatigue cracks in test specimens, and the results were analyzed to show the development of crack opening profile with increasing load and the interaction of crack closure mechanics with the effective range of stress intensity.

TL;DR: In this article, the parametric presentation methods for spectrum fatigue test results are discussed, and the mean damage method is shown to have some benefits over the other methods, but not as much as the mean value.

TL;DR: In this paper, an experimental part and a theoretical part containing both an analytical and a numerical approach for modelling the observed stiffness reduction are presented. But the difference between the theoretical model and the experimental results, especially for the T300-based composite, enables an evaluation to be made of the stiffness reduction due to fibre failure in the 0° plies.

TL;DR: In this paper, the low-cycle fatigue behavior of a high-strength CrMoV steel has been evaluated in the as-received (AR) and the quenched and tempered (QT) conditions, at room temperature.

TL;DR: In this paper, as-cast and heat-treated materials of spheroidal graphite cast iron from room temperature to 500°C were used for axial load fatigue tests.

TL;DR: In this paper, the critical value of the compressive stress intensity factor is derived based on the eigenequation of crack growth, and the analytical expression for the change in fatigue threshold with stress ratio is derived from the similarity between the crack closure stress intensity factors and K th c.

TL;DR: In this paper, the concept of energy required for active zone translation was introduced to explain transitions in material behaviour and to show how the lengths of different zones affect fatigue fracture toughness and fatigue lifetime.

TL;DR: In this paper, a plate with a shape-optimized circular hole has been developed, where surface stresses have been drastically reduced by attaching material at places of high local stresses and reducing material at locations of low local stresses.