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从压力容器的实际工况和抗震安全性设计出发,研究了压力容器用钢16MnR钢的高应变超低周疲劳性能。采用横向应变控制方法,在MTS809拉扭复合疲劳试验机上测定了试验钢应变疲劳过程中的循环应力响应特征及循环应力与应变的关系等超低周疲劳行为;通过拟合Basquin公式和Coffin-Manson公式,获得了试验钢的高应变超低周疲劳寿命预测公式。断口扫描发现,超低周疲劳下,多处裂纹萌生于试件表面,然后裂纹共同向内扩展,直到最后快速断裂。
Based on the actual condition of the pressure vessel and the design of seismic safety, the high strain and low cycle fatigue performance of 16MnR steel for pressure vessels was studied. The transverse strain control method was used to measure the ultra-low cycle fatigue behavior of the test steel during strain fatigue, such as the relationship between cyclic stress and strain, on the MTS809 tensile and torsion fatigue tester. By fitting the Basquin formula and Coffin-Manson Formula, obtained the test steel high strain ultra-low cycle fatigue life prediction formula. Fracture scanning found that under the condition of ultra-low cycle fatigue, multiple cracks were initiated on the surface of the specimen, and then the cracks extended inward together until the final rapid fracture.