通过考察碳素工具钢的表面滑移、疲劳破坏及表面裂纹的扩展条件,以统一的局部应力讨论了光滑试样和裂纹试样的疲劳特征分析和实验结果表明,在裂纹试样的名义应力小于光滑试样表面滑移门槛应力的范围内,线弹性断裂力学是有效的、对应裂纹扩展门槛值的裂尖塑性区为一常数
By investigating the criteria of slip initiation,fatigue fracture and surfacecrack propagation in a carbon tool steel under combined stresses, fatigue features of smoothand cracked specimens are discussed from the point of view of local stress. Results show that,for short cracks, linear elastic fracture mechanics is applicable provided that the nominalstress is smaller than the slip initiation threshold stress of the material, and the size of plasticzone around a crack tip is almost a constant regardless of the crack length and deformationmode under threshold condition.
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