论文部分内容阅读
采用GB6359-86规定的方法,运用数理坑计方法回归处理数据,归纳得出了15MnVNq桥梁钢的疲劳裂纹扩展中速区母材、焊缝和热影响区金属的Paris公式表达式,以及疲劳裂纹不扩展门槛值回归曲线△K_(th)(R)。并在疲劳断口微观形貌的研究方面进行了尝试,得到了二次裂纹影响疲劳裂纹扩展的证据。在残余应力影响紧凑拉伸(CT)试样疲劳裂纹扩展的研究方面也取得了进展。
The method of GB6359-86 was used to regress the data by using the mathematical pit-meter method and the Paris formula of the base metal, weld metal and heat-affected zone in the fatigue crack growth medium speed zone of the bridge was summarized. And the fatigue crack Do not extend the threshold regression curve △ K_ (th) (R). At the same time, some attempts have been made to study the microstructure of fatigue fracture, and the evidence of secondary cracks affecting fatigue crack growth has been obtained. Progress has also been made in the study of residual stress affecting the fatigue crack growth of compact tensile (CT) specimens.