Page 230 - Biaxial Multiaxial Fatigue and Fracture
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214 A. VARVANI-FARAHANI
numerically obtained at 83d6O" and 84=620" angles, and finally at the third 61 cycle, the
largest Mohr's circles were obtained at 8~=800" and 86=lOOO" angles (see Fig. 6).
Stress Mohr's circles Strain Mohr's circles
YQ
Fig. 6. Out-of-phase biaxial fatigue stressing (history C3) where two axes are at different
frequencies (a=3).
The proposed fatigue parameter for the first 01 cycle is expressed as:
The proposed fatigue parameter for the second 61 cycle is expressed as:
The proposed fatigue parameter for the third o1 cycle is expressed as:
