表面强化层疲劳裂纹扩展抗力的研究THE STUDY OF THE RESISTANCE OF SURFACEHARDENED LAYERS TO FAATIGUE CRACK PROPAGATION
俞德刚,郑经纮,王育烽,沈甫法
摘要(Abstract):
本文提出用带表面裂纹的试样来显示氯化及滚压试样的表面强化层的疲劳裂纹扩展抗力并解释和近似处理了半椭圆表面裂纹及其折回(Turn Back)现象。试验结果表明在裂纹扩展速率10~(-4)~10~(-5)mm/周范围内,氮化及滚压均提高弯曲载荷下的疲劳裂纹扩展抗力,且滚压效果优于氮化处理,而氮化试样表面的白层对疲劳抗力影响甚微。试验结果还表明其试验范围内(0.19<α/2c<0.38),半椭圆表面裂纹长轴端应力强度因子与短半轴无关。与传统的试验方法相比,这是显示表面强化层疲劳裂纹扩展抗力的有效方法,可以应用于其他表面强化层性能测试上去。
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作者(Author): 俞德刚,郑经纮,王育烽,沈甫法
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