Showing papers in "International Journal of Fatigue in 1989"

TL;DR: In this paper, the effects of non-metallic inclusions on the fatigue strength of metals are reviewed and the major factors involved are discussed and the equations for the prediction of the threshold stress intensity factor range, ΔK th, and the fatigue limit, σ w, for defects and small cracks were extended to predict those for inclusions contained in high strength steels.

TL;DR: In this paper, the combined effects of hardness and non-metallic inclusions on fatigue strength of high strength steels were investigated and the reasons for the relatively low fatigue strength in high static strength steel and the large scatter of fatigue strength values were examined.

TL;DR: In this article, a machine for carrying out fatigue tests under simple, radial and complex loads has been designed, which enables a specimen to be subjected to the loadings experienced by a propeller shaft: a combination of asymmetrical bending (plane or rotative bending) and torsion with various values.

TL;DR: In this paper, the fatigue behavior of a series of carbon/Kevlar-49/epoxy unidirectional hybrid composites has been established as a function of composition and of the ratio of the maximum to minimum stress in repeated tension and tension/compression cycling.

TL;DR: In this paper, a methodology for the tension fatigue analysis and life prediction of composite laminates subjected to tension fatigue loading is presented, which incorporates both the generic fracture mechanics characterization of delamination and the assessment of the infuence of damage on laminate fatigue life.

TL;DR: In this article, the interaction and coalescence of twin coplanar semi-elliptical cracks under both tension and bending loadings are investigated by numerical methods, where crack advance is computed on a step-by-step basis from the Paris equation using stress intensity factors calculated by the finite element method.

TL;DR: In this article, the effect of tensile mean stress on cyclic stress-strain response and high cycle fatigue life was determined experimentally on polycrystalline copper in stress-controlled tests with symmetrical and pulsating cycling.

TL;DR: In this article, the fatigue behavior of titanium alloy IMI 829 was examined at room temperature to study the effects of dwell-time on the fatigue lives for different sizes of specimen.

TL;DR: In this article, the fatigue crack response in the accelerated crack propagation range can adequately be described by the Paris equation and the onset of stable crack propagation acceleration occurred above a characteristics threshold stress intensity factor (ΔKt) which separates the accelerated from that of the delayed stable crack growth region.

TL;DR: In this paper, the authors examined the constant amplitude fatigue crack growth behavior of a conventionally (α + β ) solution treated and aged Ti-6Al-4V fan disc forging by fractographic and microstructural analysis.

TL;DR: An experimental and theoretical study was carried out on the influence of the radius of curvature at the weld toe, ϱ, in the fatigue strength of transverse non-load-carrying fillet welded joints loaded in bending and in tension as discussed by the authors.

TL;DR: In this paper, the effect of weld toe undercut depth on the fatigue life of welded plate T-joints loaded in three-point bending was investigated, and the development of the fatigue cracks was monitored using ACPD measurement techniques.

TL;DR: In this article, low-cycle fatigue tests have been carried out on CrMoV steel specimens with two different modes of surface roughness at 550 °C and it was found that the fatigue life of specimens with a rough surface is approximately half of that of specimens having a smooth surface over the plastic strain range investigated.

TL;DR: In this article, the cyclic hysteresis energy of four kinds of steel was analyzed using fully reversed constant-strain-controlled fatigue tests, and the total absorbed energy to failure was associated with the variation of cyclic energy.

TL;DR: In this article, a crack mouth opening displacement (CMOD) gauge was designed to estimate the crack length as well as the crack opening stress level in an automated fatigue crack propagation test programme.

TL;DR: In this article, the authors consider two areas where problems can arise in compliance-based closure measurements: nonlinearity of compliance traces due to plasticity and situations where the measured crack opening point does not appear to correspond with the effective crack opening points.

TL;DR: In this paper, a model is developed to predict TMF crack growth rates based solely on isothermal data, which uses a linear summation concept based on contributions to crack growth of the two dominant mechanisms which are active at the minimum and maximum temperature of the cycle: mechanical fatigue and environmentally assisted crack growth.

TL;DR: In this paper, the predicted fatigue crack initiation lives of welded plate T-joints in air and seawater environments are reported and compared with experimental data from Canadian offshore steel research.

TL;DR: In this article, a Schmidt-type factor was defined for multiaxial loading conditions, and it was shown that when the slip deformation is predominant, nonproportional cycles are more damaging than proportional or pure axial or torsional cycles.

TL;DR: The use of RMS in random load (stress) analysis and generation requires special caution as discussed by the authors, as it may suppress on the one hand maximum values of a distribution as well as exceedances of the endurance limit, and on the other hand may invert the damaging influence depending on the type of distribution.

TL;DR: In this article, two distinct plastic zones have been identified and their sizes in the direction perpendicular to the crack plane correlated with previous theoretical and experimental results, referring to specimen geometry and mechanical properties of materials.

TL;DR: In this paper, the influence of martensite content, prestraining and ageing on near-threshold fatigue crack growth in dual-phase (DP) steels was studied.

TL;DR: The Wave Action Standard History (WASH) Working Group is making steady progress in the establishment of standard load histories for fatigue testing relevant to tubular structures in the North Sea.

TL;DR: In this paper, the degradation of large diameter wire ropes which have been subjected to constant amplitude tension-tension fatigue has been investigated through a combination of experimental and theoretical research, in conjunction with detailed examinations of tested rope sections.

TL;DR: In this article, the use of correction factors in the case of related loading distributions for improving the accuracy of fatigue life predictions was considered. But, it was shown that application of conventional material memory rules in LSA1 (cycle-bycycle calculation) does not reduce the scatter of N pred / N exp ratios in comparison to LSA2 (block-by-block counting).

TL;DR: In this article, the cyclic properties of coarse-grained cast austenitic manganese (Hadfield) steels were studied, and it was shown that the material cyclically hardens, with a pronounced memory effect which is common to Austenitic steels.

TL;DR: In this paper, the equivalent strain energy method was used to predict the fatigue crack formation life of notched bend specimens with varying notch acuities in two radically different naval alloys: a quenched and tempered steel (Q1N) and an aluminium silicon bronze (ASB).

TL;DR: In this paper, the fatigue properties of laser surface alloying chromium onto AISI 1018 steel substrates using 2.5 kW CO2 continuous lasers were investigated using light microscopy, SEM, EPMA and WDS.

TL;DR: In this paper, the authors measured the ratio of cracked to original cross-sectional areas of round, unnotched specimens and monitored the apparent modulus changes after different life fractions.

TL;DR: In this paper, the authors evaluated the fatigue performance of thin aluminium alloy specimens and simple joints with holes cold-expanded either as a single thickness of material or as part of a stack-up between aluminium or steel side plates.