Abstract
The aim of this scientific work was to investigate the behaviour of cruciform welded joints under static loading using a full-field technique: Digital Image Correlation. The material curves, relative to different zones (base material, heat affected zone, weld), were obtained by hardness measurements, which were done by means of a fully automated hardness scanner with high resolution. This innovative technique, based on the UCI method, allowed to identify the different zones and to assess their different mechanical properties, which were considered in the finite element model. Finally the finite element model was validated experimentally, comparing the results with the measurements obtained using the Digital Image Correlation technique.
Highlights
W elds sometimes represent a weak point, due to the presence of possible crack-like defects along with high stress concentration effects and tensile residual stresses caused by the thermal welding process itself
The aim of this scientific work was to investigate the behaviour of cruciform welded joints under static loading using a full-field technique: Digital Image Correlation
Local approaches are applied in these cases and are mainly based on local displacement and strain measurements by strain gauges. The aim of this scientific work was to investigate the behaviour of cruciform welded joints under static loading, considering the different material properties of base material (BM), heat affected zone (HAZ) and weld metal (WM)
Summary
W elds sometimes represent a weak point, due to the presence of possible crack-like defects along with high stress concentration effects and tensile residual stresses caused by the thermal welding process itself. The strength of welded structures reduces in presence of fatigue loading. The fatigue strength of welded joints in high cycle fatigue (HCF) [4] and low cycle fatigue (LCF) [5] regimes was already investigated by the authors. Local approaches are applied in these cases and are mainly based on local displacement and strain measurements by strain gauges. The aim of this scientific work was to investigate the behaviour of cruciform welded joints under static loading, considering the different material properties of base material (BM), heat affected zone (HAZ) and weld metal (WM). The material curves, relative to the different zones were obtained by hardness measurements, which were done by means of a. The FE model was validated by means of the results obtained using a full-field technique: Digital Image Correlation (DIC)
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