4130X钢非对称非比例载荷下双轴低周疲劳行为  

Biaxial low cycle fatigue characteristics of 4130X steel under asymmetric and non-proportional loading

作　　者：秦晨 晁龙 陈凡 曹文红 黄国明 夏明 周昌玉[1] 贺小华[1] QIN Chen;CHAO Long;CHEN Fan;CAO Wenhong;HUANG Guoming;XIA Ming;ZHOU Changyu;HE Xiaohua(School of Mechanical and Power Engineering,Nanjing Tech University,Nanjing 211816,China;Zhejiang Rein Gas Equipment Co.,Ltd.,Shaoxing 312369,China)

机构地区：[1]南京工业大学机械与动力工程学院,南京211816 [2]浙江蓝能氢能科技股份有限公司,浙江绍兴312369

出　　处：《压力容器》2024年第8期9-20,共12页Pressure Vessel Technology

基　　金：江苏省研究生科研与实践创新计划项目(院级)(JXSS-029)。

摘　　要：为研究4130X钢在双轴疲劳载荷下的应力应变状态以及疲劳损伤行为,对4130X钢开展了双轴非对称比例与非比例循环载荷作用下的疲劳试验研究。从双轴循环应变幅、双轴棘轮应变、断口形貌和疲劳寿命等方面,系统分析了不同双轴加载条件下4130X钢的低周疲劳与棘轮行为。结果表明,随着双轴载荷比的减小或相位差的增大,双轴均表现出显著的循环软化现象,并且棘轮应变显著增加,双轴棘轮效应更加明显,导致其疲劳寿命减小。与其他加载情况相比,等双轴载荷比下相位差对疲劳寿命和等效应变的影响更加显著,在双轴相位差ΔФ由0°变为90°时,疲劳寿命下降90%。断口特征表明,随着双轴非比例程度的增大,韧窝由等轴韧窝逐渐转变为剪切韧窝,数量显著增加。In order to study the stress-strain state and fatigue damage behavior of 4130X steel under biaxial fatigue loading,fatigue test of 4130X steel under biaxial asymmetric,proportional and non-proportional cyclic loading was studied.The low cycle fatigue and ratcheting behavior of 4130X steel were systematically analyzed under different biaxial loading conditions from aspects of biaxial cyclic strain amplitude,biaxial ratcheting strain,fracture morphology and fatigue life.The results show that with the decrease of biaxial load ratio or the increase of phase difference,the both axes show significant cyclic softening phenomenon,and the biaxial ratcheting effect is more obvious,leading to the decrease of its fatigue life.The effect of load phase difference on fatigue life and equivalent strain is more significant for equal biaxial load ratios than that for other loading cases,and fatigue life decreases by 90%when the biaxial phase differenceΔФchanges from 0°to 90°.Fracture characteristics show that with the increase of biaxial non-proportionality degree,the number of dimples increases significantly as the dimples gradually change from isometric dimples to shear dimples.

关 键 词：4130X钢 双轴低周疲劳 非对称循环载荷 非比例循环载荷 循环软化 棘轮行为 

分 类 号：TH142[一般工业技术—材料科学与工程] TH49[机械工程—机械制造及自动化] O346.23[理学—固体力学]