Fatigue assessment of metallic components under uniaxial and multiaxial variable amplitude loading

2018 ◽  
Vol 41 (6) ◽  
pp. 1306-1317 ◽  
Author(s):  
A. Carpinteri ◽  
S. Vantadori ◽  
T. Łagoda ◽  
A. Karolczuk ◽  
M. Kurek ◽  
...  
Keyword(s):  
Variable Amplitude Loading ◽  
Fatigue Assessment ◽  
Variable Amplitude

scholarly journals Integral treatment of butt joints for the fatigue life assessment in the low cycle fatigue regime

2020 ◽  
Author(s):  
Benjamin Möller
Keyword(s):  
Fatigue Life ◽  
Life Assessment ◽  
Cyclic Behavior ◽  
Cycle Fatigue ◽  
Stress Strain ◽  
Butt Joints ◽  
Variable Amplitude Loading ◽  
Fatigue Assessment ◽  
Variable Amplitude ◽  
Integral Treatment

Abstract The framework for a fatigue assessment of welded joints under service loading conditions of crane structures from the low cycle to the high cycle fatigue regime includes the consideration of elastic-plastic material behavior, variable amplitude loading, and acceptable calculation times. Therefore, an integral treatment of butt joints has been developed for fatigue life estimation. The butt weld is considered in its entirety, so that it can be described by its cyclic behavior. The evaluation of the cyclic stress-strain behavior and tri-linear strain-life curves of butt joints for different high-strength, fine-grained structural steels, derived by strain-controlled fatigue tests, is the basis for this description. This procedure is not limited to conventionally applied gas metal arc welding only, but also the fatigue assessment of laser beam welding is possible, for example. Cyclic transient effects have been analyzed and a distinctive cyclic softening is described by linearization of Ramberg-Osgood parameters, depending on the damage content of each cycle derived from constant amplitude, strain-controlled tests. On the basis of the cyclic behavior in combination with memory and Masing behavior, a simulation of the stress-strain paths of investigated butt welds, under constant and variable amplitude loading, has been performed. Damage parameters are used to accumulate the damage cycle by cycle in order to derive the fatigue lifetime. Finally, calculated fatigue lives were compared with experimentally determined lives, showing the impact of this procedure.

Multiaxial fatigue assessment of welded connections in railway steel bridge under constant and variable amplitude loading

2018 ◽  
Vol 14 (1) ◽  
pp. 21-33 ◽  
Author(s):  
K.R. Praveen ◽  
S.S. Mishra ◽  
Prasad Babu ◽  
Andrea Spagnoli ◽  
Andrea Carpinteri
Keyword(s):  
Multiaxial Fatigue ◽  
Steel Bridge ◽  
Variable Amplitude Loading ◽  
Fatigue Assessment ◽  
Variable Amplitude
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