Fatigue crack propagation rates and threshold stress intensity factors for welded joints of HT80 steel at several stress ratios |
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Authors: | A Ohta E Sasaki MNihei M Kosuge M Kanao M Inagaki |
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Affiliation: | National Research Institute for Metals, Tokyo, Japan |
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Abstract: | Fatigue crack propagation rates and threshold stress intensity factors were measured for welded joints and base metal by using 200 mm wide centre-cracked specimens. The fatigue crack propagation properties of welded joints were similar in spite of the different zones in which the cracks propagated (ie, in the heat-affected zone and in the weld metal) and the different welding process used (submerged arc welding and gas metal arc welding). They were, however, inferior to those of the base metal. It was revealed by observation of the crack closure that the fatigue cracks were fully open during the whole range of loading, due to the tensile residual stress distribution in the middle part of the welded joints. This observation also explains the lack of a stress ratio effect on the fatigue crack propagation properties of welded joints, and their inferiority to those of the base metal. |
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Keywords: | fatigue fatigue crack growth welded joints alloy steels threshold stress intensities stress ratio effect HT80 steel |
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