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1)  fatigue crack threshold
疲劳裂纹门槛值
2)  FCP threshold
疲劳裂纹扩展门槛值
3)  fatigue crack/near-threshold value
疲劳裂纹/近门槛值
4)  fatigue initiation threshold
疲劳启裂门槛值
1.
In this paper,the experimental results of fatigue initiation threshold at sharp notch are reported for two groups of Q 235 steel under plane stress and plane strain conditions.
文章报告了两组 Q2 3 5钢小缺口试件在平面应力与平面应变条件下的疲劳启裂门槛值的测定结果。
5)  crack growth theory/fratigue threshold value
裂纹扩展理论/疲劳门槛值
6)  fatigue threshold
疲劳门槛值
1.
The fatigue threshold ofⅠ,Ⅰ+Ⅱ,Ⅰ-Ⅲmixed-mode cracks in 35CrMo steel quenched at 860℃,then tempered at 200,300,400,550,650℃respectively was studied.
研究了35CrMo钢试样在860℃淬火+不同温度回火态的复合型裂纹疲劳门槛值。
2.
According to the analysis of some theoretical models for predicting fatigue threshold of a cracked body, it is held that the tensile properties of structural steels and the stress ratio under recycle loading are main dominant factors of the fatigue threshold.
通过对各种疲劳门槛值的理论模型的分析 ,认为结构钢的拉伸性能指标和循环加载条件是裂纹体疲劳门槛值的决定因素 。
3.
The As-cast ferrite ductile iron specimens with the same chemical composition but the differ-ent graphite nodule sizes and numbers are obtained,through controlling reasonably inoculation condi-tion and cooling rate,The fatigue threshold △K_(th) and the metallographic structure near the crack are de-tected.
通过合理地控制孕育条件和冷却速度,获得了化学成分基本相同,而石墨大小、数量互异的铸态铁素体球铁试样,测定了它们的疲劳门槛值△K_(th)。
补充资料:疲劳裂纹生长
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性质:材料在连续交变应力作用下,会在其表面逐渐生成裂纹,并随着作用时间而逐渐向纵深发展,使裂纹扩展,试件的力学性能下降,最终导致完全断裂。应该指出,有些材料耐初始裂纹生长的性能很好,但一旦生成却发展很快。而另一些材料就正好相反。所以对疲劳裂纹的生成和发展是疲劳试验中最关心的性状之一。

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