Selaus avainsanan mukaan kokoelmassa "fatigue"Väitöskirjat
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Applications of the 4R method for the fatigue assessment of welded joints considering different steels, joint types, post-weld treatments, and load conditions
Acta Universitatis Lappeenrantaensis : 1172 (Lappeenranta-Lahti University of Technology LUT, 10.12.2024)The use of high-strength steels (HSS) and ultra-high-strength steels (UHSS) is a way to reduce the mass of a structure while increasing mechanical performance. However, a high strength-to-weight ratio does not guarantee ... -
Assessment of weld root fatigue strength of load-carrying fillet welded joints using notch stress approaches and finite element analysis
Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 21.11.2023)This thesis uses nominal and notch stress concepts to evaluate the fatigue strength of loadcarrying fillet welded joints (LCFWJs) made of high-strength steel. The study investigates the effect of different reference radii ... -
Finite element simulation-based fatigue assessment of welded high-strength steel joints
Acta Universitatis Lappeenrantaensis : 1287 (Lappeenranta-Lahti University of Technology LUT, 02.06.2026)The fatigue performance of welded high-strength steels (HSSs) does not improve to the same extent as in quasi-static strength. To reduce this gap, HSSs require more detailed fatigue design methods, for which finite element ... -
Laser powder bed fusion of steels : case studies on microstructures, mechanical properties, and notch-load interactions
Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 10.11.2022)Additive manufacturing has evolved over the last few decades from utilising a prototyping approach to favouring a fabrication method. Consequently, this technology has become recognised as a potential replacement for ... -
Methods for lifecycle support of hydraulically actuated mobile working machines using IoT and digital twin concepts
Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 25.10.2019)The Internet of Things and Digital Twins are popular but quite distant concepts nowadays. Many problems arise along the efforts of combining these concepts. This research work focuses on these problems and considers the ... -
Screening the critical locations of a fatigue-loaded welded structure using the energy-based approach
Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 04.06.2021)Fatigue analysis is a very important part of the design process of a welded structure. Several different methods are available, but the principal challenge is the very large number of potential critical points in a complex ... -
Stress components and local effects in the fatigue strength assessment of fillet weld joints made of ultra-high-strength steels
Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 04.12.2020)Ultra-high-strength steels (UHSSs) enable a significant reduction in material usage compared to mild steels and, thus, provide energy-efficient solutions for structural applications. In welded steel components, an increase ... -
The efficiency and damage control of a recovery boiler
Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 16.12.2019)Recovery boilers are needed to produce sustainable energy from sideline by-products of the biomass processing industry. Customers need boilers which have a reliable, long operation time without unnecessary shutdowns and ...
