| Autor: |
Andreikiv, O. É., Darchuk, O. I., Karpenko, G. V. |
| Zdroj: |
Materials Science; July 1994, Vol. 29 Issue: 4 p333-338, 6p |
| Abstrakt: |
Typical defects have been considered for large structures (isolated internal cracks, surface and subsurface defects, and defect systems), for which working formulas have been established to describe the area change on fatigue growth. When the crack edge differs little from elliptical and the stress distribution over the section of the body is close to uniform, the dependence is almost invariant with respect to the initial crack shape. This enables one to estimate the subcritical growth period simply in terms of the area. In accordance with the loading conditions and geometry, these results enable one to formulate a general equivalence criterion (from the viewpoint of working life) for different defects: they are approximately the same in effect if their integral parameters are identical (area, distance of defects from surface, and distances from other defects in a system). The criterion is important for schematizing defects on the basis of nondestructive test data and also in analyzing and extending calculations on residual service life in order to establish norms for permissible defects. |
| Databáze: |
Supplemental Index |
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