Static and fatigue analysis of the transverse and longitudinal fillet welds for a cylindrical shell under bending load
Hojat, Hamidreza (2023)
Diplomityö
2023
School of Energy Systems, Konetekniikka
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Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi-fe20231002138344
https://urn.fi/URN:NBN:fi-fe20231002138344
Tiivistelmä
Cylindrical shells subjected to cyclic bending loads are commonly used in various industries, particularly in applications involving rotating machines. Cylindrical shells are often stiffened by adding transverse and longitudinal stiffeners, and these stiffeners are commonly connected to the shell using fillet welds. Reliable fatigue assessments of the welds in stiffened cylindrical shells are of importance in the design and engineering process.
The main objective of this study is to evaluate transverse and longitudinal fillet welds of a cylindrical shell, which are subjected to cyclic loads. While analytical methods and Finite Element Analysis are as a main tools for fatigue calculations, available experimental researches are also applied to develop analyses more efficiently and accurately.
For the transverse weld assessments, three approaches including nominal stress, hot spot stress and effective notch stress methods are applied, and the longitudinal welds are evaluated based on the nominal stress method. Fatigue results for different types of fillet joints, including single-side and double-side weld as well as continuous and intermittent welds are compared in this study.
The findings demonstrates efficiency of the single side fillet weld for the transverse welding of the cylindrical shell, while nominal stress method underestimate fatigue life for this joint. It also shows the importance of the automatic continuous fillet welding for longitudinal welding applications especially for the critical locations.
The main objective of this study is to evaluate transverse and longitudinal fillet welds of a cylindrical shell, which are subjected to cyclic loads. While analytical methods and Finite Element Analysis are as a main tools for fatigue calculations, available experimental researches are also applied to develop analyses more efficiently and accurately.
For the transverse weld assessments, three approaches including nominal stress, hot spot stress and effective notch stress methods are applied, and the longitudinal welds are evaluated based on the nominal stress method. Fatigue results for different types of fillet joints, including single-side and double-side weld as well as continuous and intermittent welds are compared in this study.
The findings demonstrates efficiency of the single side fillet weld for the transverse welding of the cylindrical shell, while nominal stress method underestimate fatigue life for this joint. It also shows the importance of the automatic continuous fillet welding for longitudinal welding applications especially for the critical locations.