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Consideration of runouts by the evaluation of fatigue experiments
In EC3, the fatigue life of a steel structure subjected to a cyclic load is estimated by its detail category. This category is based on the S-N, curves which are obtained by applying the Basquin model. Statistically, this model does not allow extrapolating the S-N curves in the HCF region, neither does it consider the runouts. This affects the fatigue life estimation when a structure bears loading in HCF. To overcome these deficiencies, a new method based on a Weibull distribution is applied.
Fatigue and Fracture of Materials and Structures
This book presents selected contributions from ICMFM XX and the Polish National Conference—KKMP. The XX International Colloquium on Mechanical Fatigue of Metals (ICMFM XX) was organized on 15–17 September 2021, in the Faculty of Mechanical Engineering of the Wroclaw University of Science and Technology, in Wrocław City, Poland, in a remote form. Its aim was to facilitate and encourage the exchange of knowledge and experiences among the different communities involved in both basic and applied research in the field of fatigue of metals, looking at the problem of fatigue from a multiscale perspective, and exploring analytical and numerical simulative approaches, without losing the perspectives of the application. The Polish National Conference—KKMP 2021—was organized remotely with 50–80 prominent international participants from the fracture mechanics community.
Analysis of a Rotatable Wind Turbine Tower by means of Aero-Servo-Elastic Load Simulations
This work highlights how the costs and CO2-emissions of land-based wind turbines can be reduced by means of an innovative and material efficient support structure concept. Thereby the yaw system is placed at the tower base, allowing the whole wind turbine tower to be rotated. The potential of a rotatable inclined lattice tower concept was analysed by means of aero-servo-elastic load simulations in the FAST environment. A balance between different cost aspects revealed significant savings.
Finite Element Simulation of Residual Stresses from Welding and High Frequency Hammer Peening
Research goal of the present monograph is the establishment of an efficient engineering approach, which will include straightforward but accurate simulation models, in order to estimate the residual stress fields of welded joints introduced during welding and their post-weld treatment with High Frequency Hammer Peening. The present subject lies on the intersection of structural engineering, material science and computational mechanics.
Design of Cast Steel Components under Cyclic Loading
This work presents a design approach that links fatigue resistance of cast steel component to permissible defect sizes. It is based on fractures mechanics, is in line with experiences of the last 60 years and validated by extensive experimental as well as numerical investigations on different scales and under consideration of real casting defects. By following established assessment methods, the design concept is adapted to practical building applications.
Auslegung von Verstärkungen ermüdungsgeschädigter Stahlbauteile mit aufgeklebten Faserverbundwerkstoffen
Im Rahmen der Arbeit werden umfangreiche experimentelle und numerische Untersuchungen zum Rissfortschrittsverhalten in Stahlblechen unter zyklischer Beanspruchung, welche mit aufgeklebten CFK-Lamellen verstärkt wurden, sowie zum Trag- und Versagensverhalten geklebter CFK-Stahl-Überlappverbindungen durchgeführt. Anhand der Untersuchungsergebnisse wird ein ingenieurmäßiges bruchmechanisches Verfahren zur Abschätzung der Restlebensdauer CFK-verstärkter Stahlbleche abgeleitet und validiert. - Within the scope of the present work, extensive experimental and numerical investigations are carried out on the crack propagation behaviour in steel plates under cyclic loading, which have been reinforced with adhesively bonded CFRP lamellas, as well as on the load-bearing and failure behaviour of CFRP-steel double-lap joints. Based on the results, a fracture mechanics engineering procedure for estimating the remaining service life of CFRP-reinforced steel plates is developed and validated.
Zum Dämpfungsverhalten viskoelastischer Klebverbindungen im Stahlbau
Baukonstruktionen sind häufig dynamischen Belastungen ausgesetzt. Hierdurch hervorgerufene Strukturschwingungen, die sowohl die Tragfähigkeit als auch die Gebrauchstauglichkeit negativ beeinflussen, müssen häufig durch dämpfende Maßnahmen begrenzt werden. In dieser Arbeit werden numerische, experimentelle und analytische Untersuchungen zum Dämpfungsverhalten geklebter Überlapp- und Kreishohlprofilsteckverbindungen unter Berücksichtigung spezifischer Randbedingungen des Bauwesens vorgestellt. - In this work, the damping properties of adhesively bonded joints are investigated numerically, experimentally and analytically. In numerical investigations on steel structures, the potential of bonded joints to optimise the structural dynamics is demonstrated. The damping properties of bonded joints are determined in experimental investigations. The development of a methodology for the analytical identification of functional relationships between the test results is a further focus of the work.
Ein Beitrag zur Auslegung tragender Klebverbindungen im Fassadenbau
In der vorliegenden Arbeit werden Untersuchungen zur Auslegung tragender Klebverbindungen im Fassadenbau beschrieben. Das Kernelement ist hierbei die Analyse des zeit- und temperaturabhängigen Tragverhaltens der Klebverbindungen. Dazu sind Einwirkungsvorgänge analysiert, das zeit- und temperaturabhängige Verhalten verschiedener Klebstoffe experimentell untersucht und theoretische Betrachtungen zum Tragverhalten durchgeführt. - This work describes investigations into the design of load-bearing bonded joints facade construction. The core element is the analysis of the time- and temperature-dependent load-bearing behavior of bonded joints. For this purpose, actions are analyzed, the time- and temperature-dependent behavior of various adhesives is investigated experimentally and theoretical considerations of the load-bearing behavior are carried out.
