Abstract: Suggests some calculating
formulas and methods with respect to the damage evolving rate da/dN|i and the fatigue life
ΣNoi and ΣNpi in varied history from
uncrack to microcrack initiation until fracture for a
crankshaft, which are suitable to stress concentration positions
about its journal fillets and oil holes on a crankshaft, that it
is undergone to bending, twisting and shearing loading and
subjected to unsymmetric cyclic cyclic many-stage loading. Last
the total life in whole process is estimated by ΣN=ΣNoi+ΣNpi.
Key words:
Crankshaft Many-stage loading Damage evolving rate Fatigue crack Life estimation
Manuscript received on January 3, 1994
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