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偏心旋转低周疲劳下料的声发射特性实验
英文标题:Experiment of acoustic emission characteristics for eccentric rotating low cycle fatigue cutting
作者:金东 李靖祥 任芋见 赵升吨 杜威 
单位:西安交通大学 
关键词:偏心旋转 疲劳下料 声发射 偏心位移 断裂监测 
分类号:TG386.43
出版年,卷(期):页码:2019,44(6):168-172
摘要:

采用偏心旋转低周疲劳下料工艺,对304不锈钢和16Mn钢两种材料进行了下料实验,通过施加偏心位移的方式施加疲劳载荷,并采集了管料断裂过程中的声发射信号,提取了声发射信号的峭度、幅值、振铃累积计数和频谱。发现这些特征值与断裂过程吻合度比较高,能够比较准确地反映下料过程中的断裂各阶段变化,这是由于声发射信号检测到的是材料的应变能的释放,正好与断裂过程中的能量释放相吻合。对304不锈钢和16Mn钢断裂过程中的声发射信号进行了对比,发现了不同材料的声发射各参数的具体数值有所不同,这是由于材料本身属性的差异造成的。实验结果表明,管料在偏心旋转低周疲劳下料过程中的断裂变化可以通过声发射信号检测,并通过一些特征参数明确地表征出来,声发射可以用于偏心旋转低周疲劳下料的监测。

The cutting experiments of 304 stainless steel and 16Mn steel were conducted by eccentric rotation low cycle fatigue cutting process, and the fatigue load was applied by applying eccentric displacement. Furthermore, the acoustic emission signal during the fracture process of tube was collected, and the kurtosis, amplitude, ringing cumulative count and spectrum of the acoustic emission signal were extracted. It is found that these eigenvalues are highly consistent with the fracture process to accurately reflect the changes of various fracture stages in the cutting process, and this is because the acoustic emission signal detects the release of the strain energy of material, which coincides with the energy release during the fracture process. Comparing the acoustic emission signals during the fracture process of 304 stainless steel and 16Mn steel, it is found that the specific values of various parameters for the acoustic emission of different materials are different, which are caused by the difference in the properties of the material itself. The experimental results show that the fracture change of tube during the cutting process of eccentric rotation low cycle fatigue cutting is detected by the acoustic emission signal and clearly featured by some characteristic parameters, and the acoustic emission is used to monitor in the process of the eccentric rotation low cycle fatigue cutting.

基金项目:
国家重点研发计划“智能农机装备”重点专项(2017 YFD0700200);国家自然科学基金面上项目(51675414);陕西省科学技术研究发展计划工业攻关计划(2015GY125)
作者简介:
金东(1996-),男,硕士研究生 E-mail:525053923@qq.com 通讯作者:李靖祥(1984-),男,博士,副教授 E-mail:jxli.xjtu@xjtu.edu.cn
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