Showing papers in "International Journal of Fatigue in 2006"

TL;DR: In this article, the mechanism for the formation of the GBF area was proposed as the "dispersive decohesion of spherical carbide" model, in which during the fatigue process multiple microcracks are initiated dispersively by de-cohesion of the carbide from the matrix around a non-metallic inclusion.

TL;DR: In this paper, the multi-stage fatigue life diagrams with a conventional high-cycle fatigue (HCF) limit and a possible lower fatigue limit in the UHCF range are discussed for both classes of materials in terms of the relevant fatigue cracking mechanisms.

TL;DR: In this paper, the authors investigated the effect of the self-same epoxy interlayer on the interlaminar fracture properties under modes I and II loadings on the bases of the fractographic observations and mechanism considerations.

TL;DR: In this paper, an ultrasonic fatigue testing system was designed and built 15 years ago to determine crack growth threshold and S-N curve of metals and the first results were published in ASTM STP 1231 (1994), ASTM StP 1411 (2002) and in proceedings of Fatigue 2002.

TL;DR: In this paper, a microstructure-based fatigue life model for ultrafine-grained (UFG) materials is presented, and the microstructural reasons for this behaviour are discussed.

TL;DR: In this article, an analytical model based on cumulative damage was used for predicting the damage evolution in composite materials, verified with experimental data from a carbon/epoxy composite fatigued under tension-tension load.

TL;DR: In this paper, the influence of voids in the initiation and propagation of static flexural and flexural fatigue failures of unidirectional carbon fiber composite was investigated, and a strong correlation between large voids (area > 0.03 mm2) and a detrimental effect on the mechanical properties was found.

TL;DR: In this paper, the fatigue and damage tolerance issues related to the application of the fiber metal laminate Glare joints in the upper fuselage skin structure are discussed and compared to the monolithic aluminium behavior.

TL;DR: In this paper, the authors evaluated the relationship between fracture toughness and water absorption fatigue according to different polymer matrices such as epoxy and vinyl-ester composites and found that water uptake of the epoxy composites was found to increase with cyclic times.

TL;DR: In this paper, it is assumed that the internal stresses in the aluminium layers of a Fibre Metal Laminate are different from the applied stresses on the laminate because of differences in stiffness and coefficient of thermal expansion between the metal and fibre layers.

TL;DR: In this paper, a non-linear continuum damage mechanics model based on general thermodynamic framework developed by Lemaitre and Chaboche is presented to take into account the material damage evolution at different load levels.

TL;DR: In this paper, the effect of the stress ratio on fatigue properties of a bearing steel (JIS:SUJ2) in the long life regime was experimentally examined under axial loading.

TL;DR: In this paper, a multiaxial high-cycle fatigue initiation life prediction model for railroad wheels is proposed, and the effects of wheel diameter, vertical loading, material hardness and material fatigue properties on fatigue crack initiation life are investigated using the proposed model.

TL;DR: In this article, the authors highlight some fatigue and lifetime aspects on wind turbine rotor blades made of composite materials, including an historical part in connection with glider technology, the presentation of relevant S-N curves not only for the 0°-orientated fibres representing the spar cap but also for ±45°-layups in shear web and shell, the influence of fibre content and architecture, of environmental effects, a view on lifetime prediction on structural elements as well as on present and future work.

TL;DR: In this paper, the authors investigated two thermographic testing techniques with the aim of providing an in situ characterization technique of damage during fatigue testing of the mentioned carbon fiber reinforced polymer (CFRP) specimens.

TL;DR: In this paper, the effects of microstructure and temperature on the fatigue behavior of a commercial AlSi-Cu alloy used in automotive engine components were investigated for lifetimes as long as 109 cycles using ultrasonic fatigue instrumentation operating at 20 kHz.

TL;DR: In this paper, the authors performed ultrasonic fatigue tests with smooth and notched bearing steel of two batches (JIS SUJ2-A and SUJ 2-B) and found that the S-N curves obtained from the smooth specimens were different and both did not show a distinct two-step.

TL;DR: In this article, the effects of the process-induced residual stress profile and the white layer on rolling contact fatigue (RCF) are poorly understood, and a series of RCF tests were conducted for hard turned AISI 52100 steel components.

TL;DR: In this article, the effect of hydrogen on the fatigue properties of alloys which are used in fuel cell (FC) systems has been investigated, and the results showed that there was a degradation in fatigue crack growth resistance due to hydrogen in the case of SUS304 and SUS316 austenitic stainless steels.

TL;DR: In this paper, very high cycle fatigue tests have been performed for two, two-phase steel grades, one martensitic-ferritic low-alloyed steel and one martinsitic-austenitic stainless steel, in order to investigate the formation of subsurface non-defect fatigue crack origins (SNDFCO).

TL;DR: In this paper, the authors deal with the fatigue crack initiation under multiaxial non-proportional loadings in a natural rubber and propose two fatigue crack criteria, the first based on the first and second invariant of the Cauchy stress tensor, the second, based on micromechanisms of crack initiation, consist of a critical plane approach under large strain conditions using a micro to macro approach.

TL;DR: In this paper, different alloys, failed under high frequency fatigue conditions, used in the automotive industry, were studied: steels, heat treated at different conditions, cast iron and cast aluminium with different tensile strength ranging from 220 to 2350 MPa.

TL;DR: In this article, the multi-axial fatigue strength of notched specimens made of C40 carbon steel (normalised state), subjected to combined tension and torsion loading, both in-phase and out-of-phase, was investigated.

TL;DR: In this article, a numerical micro-mechanical crack-propagation model has been developed, which accounts for the abnormal propagation behavior of short cracks as compared to long cracks in a two-phase austenitic-ferritic duplex steel.

TL;DR: In this article, a plastic ratcheting based fatigue failure model for HSLA steels was developed from a combination of results from experiments and finite element simulations using crystal plasticity constitutive relations.

TL;DR: In this article, a total fatigue life model for delaminated composite structures is presented, which includes the delamination growth in three domains, namely subcritical, linear, and final fracture.

TL;DR: In this article, the authors used ultrasonic equipment to perform cyclic torsion and cyclic tension-compression fatigue experiments with the aluminium alloy 2024-T351 in the high and very high cycle fatigue regime.

TL;DR: In this paper, experimental investigations on both mixed mode overloads, which are interspersed into a Mode I baseline level loading, and mixed mode block loadings are presented, and it is shown that the retardation effect decreases with an increasing amount of Mode II of the overload.

TL;DR: In this paper, a fatigue crack initiation micro-mechanisms and their link to the local stress and/or strain history is investigated. Butt et al. showed that if large strain conditions are correctly taken into account, cracks are found to propagate systematically in the direction given by the maximal first principal stress reached during a cycle.

TL;DR: In this article, the upper and lower limits of life are estimated using the proposed life equations, where the upper life limit is obtained by assuming that the dominant cracking mechanism is Case A and the lower life limit, which is the case B, is derived from the amount of dissipated energy over life cycles.