The present paper summarises the application of NSIF approach to stress analysis and high cycle fatigue assessment of welded joints. This approach is based on linear elastic stress analysis of the open sharp corner defined at the weld toe; in that corner the NSIFs evaluate the intensity of the stress singularity similarly to the evaluation of the stress field ahead of the tip of the cracks by means of SIFs. When the opening angle at the weld toe, as usual in fillet weldments, is equal to 135°, the high cycle fatigue strength of welded joints has been demonstrated to be strongly related to the range of mode I NSIF, if the fatigue loading is mainly perpendicular to the weld bead. The paper summarises also the most efficient methods for NSIF evaluation and the main topics under investigation concerning fatigue strength assessments of geometrically complex welded joints under uniaxial and multi-axial loads.
High Cycle Fatigue behaviour of welded joints based on Notch Stress Intensity Factors
TOVO, Roberto
2005
Abstract
The present paper summarises the application of NSIF approach to stress analysis and high cycle fatigue assessment of welded joints. This approach is based on linear elastic stress analysis of the open sharp corner defined at the weld toe; in that corner the NSIFs evaluate the intensity of the stress singularity similarly to the evaluation of the stress field ahead of the tip of the cracks by means of SIFs. When the opening angle at the weld toe, as usual in fillet weldments, is equal to 135°, the high cycle fatigue strength of welded joints has been demonstrated to be strongly related to the range of mode I NSIF, if the fatigue loading is mainly perpendicular to the weld bead. The paper summarises also the most efficient methods for NSIF evaluation and the main topics under investigation concerning fatigue strength assessments of geometrically complex welded joints under uniaxial and multi-axial loads.I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
