A fracture model for surface flaws and certain types of weld defects in ductile materials
✍ Scribed by A.Janne Carlsson
- Publisher
- Elsevier Science
- Year
- 1973
- Tongue
- English
- Weight
- 675 KB
- Volume
- 5
- Category
- Article
- ISSN
- 0013-7944
No coin nor oath required. For personal study only.
✦ Synopsis
A model is proposed for prediction of fracture initiation from surface flaws, bands of slag inclusions and zones with low yield strength in thin-walled structures. The mod del applies to cases where the whole ligament or defect zone is plasticized. Application of the model to, esign cases requires information from stress and elongation measurements on tensile specimens cut perpendicular to defect regions of the actual type. Predictions by the model of critical stresses are compared to results from burst tests on pipes with surface flaws.
The correlation is found to be good and existing deviations between experiment and theory can be given a rational explanation within the framework of the model. This suggests that bulging and out of plane loading effects which are not taken into account in the model are not significant in these problems. The model thus makes a "limit" analysis possible for "two-dimensional" structures containing defects of the types mentioned above.