Topic
Fatigue limit
About: Fatigue limit is a research topic. Over the lifetime, 20489 publications have been published within this topic receiving 305744 citations. The topic is also known as: endurance limit & fatigue strength.
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TL;DR: In this paper, a nanostructured surface layer was formed on a carbon steel by means of surface mechanical attrition treatment (SMAT), and the microstructure of the surface layer of the SMATed sample was characterized by using scanning electron microscopy (SEM) and TEM.
92 citations
TL;DR: In this article, the effects of mean stress on the cyclic deformation and fatigue life of smooth uniaxial fatigue specimens made from SAE 1045 steel hardened to 55 HRC were investigated.
92 citations
TL;DR: In this article, the structure and fatigue properties of Ck45 steel were evaluated and compared with a standard nitriding steel, and it was found that thermochemical processing significantly increased the microhardness and fatigue limit.
Abstract: In this research the structure and fatigue properties of plasma and gas nitrided Ck45 steel were evaluated and compared with a standard nitriding steel. Plasma treatments were carried out using a semi-industrial size furnace in appropriate nitrogen–hydrogen mixtures and a rotating–bending fatigue machine was employed to obtain the fatigue limits. The microhardness profiles were obtained and used to demonstrate the case depth. The structures of surface layers and diffusion zone were examined by optical and scanning electron microscopy and X-ray diffraction. It was found that thermochemical processing significantly increased the microhardness and fatigue limit of Ck45 steel; increasing the fatigue limit to more than 50% was noticed after 70-h gas nitriding, similar improvements were achieved using plasma treatment in a 5-h cycle. XRD results indicated that the compound layer formed in plasma nitriding was mono-phased and thinner than the two-phase layer formed by the gaseous method which also contained iron oxide.
92 citations
TL;DR: In this paper, a number of fatigue cracks were found in many butt welds in the longitudinal ribs of the orthotropic deck of the Kinuura Bridge (Japan) in June 2003.
92 citations
15 Feb 2012-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: In this article, the authors investigated the whole-life transformation ratchetting and fatigue failure (including functional fatigue and structural fatigue) of super-elastic NiTi shape memory alloy by uniaxial stress-controlled cyclic loading tests and at room temperature.
Abstract: The whole-life transformation ratchetting and fatigue failure (including functional fatigue and structural fatigue) of super-elastic NiTi shape memory alloy were observed by uniaxial stress-controlled cyclic loading tests and at room temperature. The effects of peak stress, mean stress and stress amplitude were discussed, and then the interaction of transformation ratchetting and fatigue was then investigated. It is concluded that the whole-life transformation ratchetting of super-elastic NiTi shape memory alloy depends greatly on the stress levels and loading modes, and the dissipated energy in each cycle progressively decreases with the increasing number of cycles, which represents a functional degradation. The results also show that the structural fatigue life of the NiTi alloy presented under the stress-controlled cyclic loading is dependent on the peak stress, mean stress and stress amplitude, and the transformation ratchetting shortens the fatigue life apparently. The fatigue life decreases with the increasing dissipated energy, and a balance between dissipated energy and structural fatigue life should be reasonably considered in the design of damping devices of the NiTi alloy.
92 citations