Elasto-plastic finite-element study of the effect of residual stresses upon double edge-cracked plate
✍ Scribed by S.A. Meguid; J.A. Coufopanos
- Publisher
- Elsevier Science
- Year
- 1986
- Tongue
- English
- Weight
- 782 KB
- Volume
- 23
- Category
- Article
- ISSN
- 0013-7944
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✦ Synopsis
A two-dimensional elasto-plastic finite-element study is made of a double edgecracked plate subjected to boundary loading comparable to the yield load of the material. The development and spread of the plastic zone ahead of the crack tips was examined for different magnitudes of the boundary load. The spread was then compared with existing models, and was used for the determination of modified stress-intensity factors. As a result of subsequent unloading, the cracked surfaces are subjected to a nonuniform residual stress profile normal to the plane of potential crack growth in the untracked part of the body. The corresponding residual stress-intensity factors were then calculated and superimposed upon an applied stress intensity. The resulting effective stress-intensity factors and their influence on fatigue, together with the limitations of the current approach and relative advantages and disadvantages for use in engineering design, are discussed.
NOTATrON
Initial edge crack length Final edge crack length Load per unit length Irwin's estimate of plastic zone Elastic modulus of the material Con~guration factor for a point load Mode I stress-intensity factor Applied stress-intensity factor Residual stress-intensity factor Effective stress-intensity factor Model configuration factor for boundary load Plate width Yield stress of plate Length of plastic zone (finite-element model) Poisson's ratio Dugdale's extent of plastic zone Applied stress Stress normal to the plane of potential crack growth Residual stress normal to the plane of potential crack growth Effective stress normal to the plane of potential crack growth