Consideration of imperfections and support effects in the fatigue assessment of welded cruciform joints
-
Alexander Niederwanger
, Markus Ladinek and Gerhard Lener
Abstract
The strain-life approach appears to be a powerful tool to design components against fatigue failure. Given its general theoretical background, it may be applied to a wide range of cases. In the contribution at hand, its application to welded components, and especially the incorporation of size effects in the concept has been investigated. For this purpose, eight welded cruciform joints were tested for fatigue at two different load amplitudes, accompanied by supplementary investigations such as hardness measurements and tensile tests. The observed fatigue lives were compared to numerically estimated ones. Special attention was paid to the consideration of imperfections in the calculations. The weld geometries were modeled once using an idealized shape and once with a realistic representation obtained by 3D-laser scanning. Additionally, different methods to approximate cyclic material parameters were investigated. The results show an improvement in prediction accuracy if the real weld geometry is used. However, by doing so, the incorporation of size effects via a highly stressed area is open for discussion. Due to the high local stress and its steep gradients, as a result of the scanned weld surface, the calculated areas are very small, which raises the question whether this is still within the limits of its application. Regarding prediction accuracy, the fatigue lives of either one or the other load amplitudes were properly estimated. This issue may be addressed by modifying the slope of the strain-life curve for welded components, which can be achieved by a parameter fitting procedure through a large set of experiments.
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Articles in the same Issue
- Inhalt/Contents
- Contents
- Fachbeiträge/Technical Contributions
- Strain rate effect on the acoustic emission characteristics of concrete under uniaxial tension
- Characterization of thick carbon/basalt hybrid fiber polyester composites with graphene nanoplatelets
- Influence of powder nitriding on the mechanical behavior of laser-powder bed fusion processed tool steel X30CrMo7-2
- Consideration of imperfections and support effects in the fatigue assessment of welded cruciform joints
- Roll optimization via numerical modeling of stress distribution
- Submerged arc welding of Ramor 500 Steel and numerical modeling of the residual stress
- Life extension heat treatment of IN 783 bolts
- Increased load bearing capacity of mechanically joined FRP/metal joints using a pin structured auxiliary joining element
- Innovative characterization and mechanical properties of natural cellulosic Coccinia Indica fiber and its composites
- Post-weld heat treatment effects on the tensile properties of cold metal arc welded AA 6061-T6 aluminum joints
- Wear and corrosion behavior of coconut shell ash (CSA) reinforced Al6061 metal matrix composites
- Optimization of cutting parameters with respect to roughness for machining of hardened AISI 1040 steel
- Shunting effects on the resistance spot welding parameters of DP600
- Properties of P460-S355 submerged arc welds
- BEZUGSQUELLEN
- Materials Testing