Abstract
A cumulative-damage approach for predicting fatigue-crack initiation in engineering structures subjected to random loading is outlined. This procedure is based on the assumption that if the stresses and strains at the critical location in a structure can be related to the cyclic stress-strain properties of smooth laboratory specimens, the crack-initiation life in the structure will be the same as the specimen. A flow diagram, indicating the steps required for implementing this procedure on a high-speed digital computer, is discussed in detail.
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Abbreviations
- E :
-
elastic modulus
- K′ :
-
cyclic-strength coefficient
- K f :
-
fatigue-notch factor
- 2N f :
-
reversals to failure
- ΔS :
-
nominal stress range
- b :
-
fatigue-strength exponent
- c :
-
fatigue-ductility exponent
- Δe :
-
nominal strain range
- n′ :
-
cyclic strain-hardening exponent
- Δ∈:
-
local strain range
- ∈f′ :
-
fatigue-ductility coefficient
- Δσ:
-
local stress range
- σ o :
-
mean stress
- σƒ′:
-
fatigue-strength coefficient
References
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Socie, D.F. Fatigue-life prediction using local stress-strain concepts. Experimental Mechanics 17, 50–56 (1977). https://doi.org/10.1007/BF02326426
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DOI: https://doi.org/10.1007/BF02326426