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Long-LVe Multiaxial Fatigue of a Nodular Gmphite Cast Iron 121

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NOMENCLATURE
Jarea square root area of a defect projected onto maximum normal stress plane, pm

b Basquin exponent
BHN Brinell hardness
C Coffin-Manson exponent
E elastic moduus (MPa)
HV Vicker's hardness, kgf/mm2
k normal stress sensitivity coefficient, Findley parameter
Nf cycles to failure
Prank cumulative defect size probability based on rank probability analysis
R stress ratio, Cmin / Omax

Rpo.2 0.2% offset yield strength
Rm ultimate tensile strength
AW total virtual stain energy on a plane (VSE model)
AWI virtual tensile stain energy on a plane (VSE model)
Awn virtual shear stain energy on a plane (VSE model)
Awe elastic work during a proportional cycle (VSE model)
AWp approximate plastic work during a proportional cycle (VSE model)
fatigue ductility coefficient
Et
1 range of maximum principal normal strain
AEP range of normal plastic strain for proportional loading
AY shear strain range
h biaxial stress ratio, a2 / 01