Residual stresses at a longitudinal stiffener — Web frame intersection and their effects on crack growth
✍ Scribed by Rutger T. Ogeman; B.Lennart Josefson; Anders Ulfvarson
- Publisher
- Elsevier Science
- Year
- 1995
- Tongue
- English
- Weight
- 662 KB
- Volume
- 8
- Category
- Article
- ISSN
- 0951-8339
No coin nor oath required. For personal study only.
✦ Synopsis
Stress coining at geometrical discontinuities may introduce compressive residual stresses which will lower the propagation of surface cracks and thus increase the fatigue life. In a non-linear finite element analysis, the residual stresses after welding of a transverse web-frame to a ship hull plating is first estimated. Stress coining of one corner of a longitudinal cut-ouJ! in a transverse web-frame is then simulated in detail. The calculated residual compressive tangential stresses in the corner of the cut-out is seen to lower the propagation of edge cracks. Experiments performed on webframes taken from a shipyard after manufacturing show indeed that large tensile residual stresses exist in the web-frame after welding. Stress coining is therefore believed to have a beneficial effect on the fatigue life.