Abstract
Halford's plastic-energy concept for lowcycle fatigue is extended to the medium- and high-cycle ranges. The resulting equations are compared with 74 sets of data in the medium- and high-cycle ranges. The difference in stress between theory and experimental data is less than ±5 percent.
The plastic-hysteresis-energy analysis for fatigue is shown to be consistent with the octahedral shear-stress theory. In addition, an improvement is presented for Manson's correlation for the total strain amplitude at 104 cycles.
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Abbreviations
- c :
-
Coffin-Manson constant (fatigue ductility exponent)
- N :
-
number of cycles to failure
- n′:
-
strain-hardening exponent
- W f :
-
fatigue toughness, in.-lb/in.3
- ΔW :
-
plastic hysteresis energy per cycle, in.-lb/in.3
- ΔW o :
-
endurance hysteresis energy per cycle, in.-lb/in.3
- ε f :
-
true fracture ductility
- ε p :
-
true plastic-strain amplitude
- ε T :
-
total-strain amplitude
- σ a :
-
true-stress amplitude, psi
- σ f :
-
true fracture stress, psi
- σ o :
-
endurance limit, psi
- σ μ :
-
ultimate tensile strength, psi
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Consultant, IBM Corp.
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Chang, C.S., Pimbley, W.T. & Conway, H.D. An analysis of metal fatigue based on hysteresis energy. Experimental Mechanics 8, 133–137 (1968). https://doi.org/10.1007/BF02326108
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DOI: https://doi.org/10.1007/BF02326108