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Abstract:
In the present paper, the overloading effect on the impact fatigue
crack initiation life (IFGIL) of 300M ultra-high strength steel was
investigated. The results show that , in a certain limit, the tensile
overlonding increases IFCIL. The compressive residual stress induced by
overloading is a main mechanism of the effect of overloading on IFCIL,
and the varing of material properties which induced by overloading has
no significant effect on it. After tensile overloading, the compressive
residual strain εR, at the notch root of specimen is related to IFCIL,
Ni, by a relation as: NI=N0·exp（λεR）, where No and λ are constants.
Key words:
高强度钢 疲劳裂纹
Received 199004, received in revised form 199009
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