Structural features of growth of short cracks in a high-strength steel
- All-Union Institute of Aviation Materials, Moscow (Russian Federation)
Differences in the relationships governing the propagation of short and long cracks can, as reported by a large number of investigators, be associated with different conditions of their opening, the effect of the microstructure of the metal, and a large plastic zone, if failure process takes place at high stresses. Therefore, various approaches are used to obtain a single diagram of fatigue failure, namely: determination of the rate of crack growth as a function of the stress intensity factor (SIF) with a correction which takes into account closure of the short crack determined by the roughness of the microrelief on its surfaces; introduction of a formal addition to the length of a real short crack; restriction of the region of application of the linear fracture mechanics by the condition {delta}{sub min} < (2/3){delta}{sub y.c} ({delta}{sub y.c} is the cyclic yield limit) at a crack length of {ell} > 599 {mu}m. 5 refs., 6 figs., 2 tabs.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 159580
- Journal Information:
- Materials Science, Vol. 27, Issue 5; Other Information: PBD: Mar 1992; TN: Translated from Fiziko-Khimicheskaya Mekhanika Materialov; 27: No. 5, 48-53(Sep-Oct 1991)
- Country of Publication:
- United States
- Language:
- English
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