Linear elastic fracture mechanics relates fatigue crack growth with the stress intensity factor at the crack tip. Presence of residual deformations at the tip of a fatigue crack reduces the crack tip stress intensification such that effective stress intensity range AK~ = U-AK. In this paper use of e
Some formulas for the crack opening stress level
โ Scribed by J. Schijve
- Publisher
- Elsevier Science
- Year
- 1981
- Tongue
- English
- Weight
- 337 KB
- Volume
- 14
- Category
- Article
- ISSN
- 0013-7944
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โฆ Synopsis
Crack growth data for 2024-T3 sheet material were analysed with different formo~as for A&, as a function fo the stress ratio R. The data covered R values from -LO to 0.54. A good correlation was obtained for AK&AK = 0.55 + 0.33R + 0.12R2. The relation between log daldn and log A& was nonlinear for high crack rates (> 1 pm/c).
๐ SIMILAR VOLUMES
When these data are applied to the formula derived by M. A. Schroedl and C. W. Smith, the stress intensity factor K, can be calculated. Comparing this computed K, with that given by theoretical formula, we have found the error to be within t 5.20%. It is believed that the result of this test has met
## An elementary approximate formula for the stress intensity factor for the pressurized star crack is established. The formula is sufficiently accurate to be used in practical applications in place of the more complex formulas derived by Westmann [l] and Williams [2]. Science Ltd. All rights rese