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Ralf Glienke Filip Wegener Andreas Gericke Adolf F. Hobbacher Knuth‐Michael Henkel Frithjof Marten Hans‐Peter Günther 《Stahlbau》2019,88(10):968-987
Experimental and numerical investigations on the fatigue strength of welding details in tubular steel towers for wind turbines At low‐wind locations, economic operation of wind turbines is usually only possible with large rotor diameters and hub heights. Large hub heights present great challenges to the ultimate and fatigue limit state of the towers, which must meet certain static and dynamic requirements for the safe operation of the turbine. For material‐efficient tubular steel tower structures, higher requirements are therefore necessary for the fatigue strength of welded notch details. This article deals with investigations to evaluate the fatigue strength of a typical design detail, the weld bushing. In addition, alternative concepts with the aim of increasing the fatigue strength are presented and evaluated, which on the one hand focus on the reduction of heat input and on the other hand on the surface layer hardening. In addition to experimental investigations on the influence of plate thickness and mean stress, the newly published standard DIN 18088‐3 [1] will be used to examine the possibilities of a practical application of numerically based verification concepts for fatigue strength and compare them with the test results. 相似文献
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Large amounts of lubricants having strong environmental effects are released into the environment. This has led to the development of so‐called ‘environmentally acceptable’ lubricants based on synthetic and/or native esters. The aquatic toxicity of these lubricants is low and they are readily biodegradable. However, the biodegradation rate can be reduced after application. The aim of this study is to understand the lower biodegradation rate and the processes occurring during application. The changes are quantified using elemental analyses, high performance liquid chromatography with evaporative light scattering detector and mass spectrometer, as well as a combined screening method consisting of Fourier transform infrared spectroscopy, nuclear magnetic resonance spectroscopy and electrospray ionization mass spectrometry. The results of chemical analyses indicate that the main components are cracked, and double bonds of the main components are eliminated by oxidation causing polymerization effects. The intensity of these effects is dependent on the kind of use and the presence of additives. These modifications are responsible for the changes in the ecological and technical characteristics. Copyright © 2006 John Wiley & Sons, Ltd. 相似文献
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Ohne Zusammenfassung
Mitteilung aus dem Institut für Holzforschung der Universit?t München 相似文献
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