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材料导报  2018, Vol. 32 Issue (16): 2837-2841    https://doi.org/10.11896/j.issn.1005-023X.2018.16.025
  金属与金属基复合材料 |
不同加载频率下FV520B-I的疲劳行为与疲劳寿命
赵清晨, 王金龙, 张元良, 沈毅鸿, 刘淑杰
大连理工大学机械工程学院,大连 116023
Fatigue Behavior and Fatigue Life for FV520B-I at Different Loading Frequencies
ZHAO Qingchen, WANG Jinlong, ZHANG Yuanliang, SHEN Yihong, LIU Shujie
School of Mechanical Engineering, Dalian University of Technology, Dalian 116023
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摘要 针对高强度钢FV520B-I分别进行了140 Hz和20 kHz两种加载频率下的疲劳实验。实验数据表明,20 kHz加载频率下的疲劳寿命值均高于同应力幅值140 Hz加载频率下的疲劳寿命值,而20 kHz加载频率下材料的疲劳强度(450 MPa)低于140 Hz加载频率下的疲劳强度(500 MPa)。试件断口分析表明,加载频率的大幅提高使得疲劳失效由表面粗糙度缺陷引起的表面疲劳失效转变为内部非金属夹杂物引起的内部疲劳失效。基于三参数模型对实验数据进行拟合,建立了FV520B-I在不同加载频率下的疲劳寿命转换模型,提出了FV520B-I的疲劳寿命转换系数S'0,并发现转换系数S'0随着加载应力幅值的增大而增大,即加载频率对疲劳寿命的影响随着应力幅值的增大而增强。研究结果表明,疲劳寿命转换模型可以将超高加载频率下的疲劳寿命转换为传统加载频率下的疲劳寿命,且可以应用于FV520B-I的再制造工程疲劳分析。
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赵清晨
王金龙
张元良
沈毅鸿
刘淑杰
关键词:  超高周疲劳  FV520B-I  加载频率  疲劳寿命转换  三参数模型    
Abstract: Fatigue tests for FV520B-I were carried out at two frequencies: the conventional frequency (140 Hz) and the ultrasonic frequency (20 kHz). The experiment data indicated that fatigue life at the ultrahigh loading frequency was higher than the one under the low loading frequency at the same stress amplitude, but the fatigue strength (450 MPa) at the ultrahigh loading frequency was lower than the one (500 MPa) under the low loading frequency. By analyzing the fracture of the specimen using scanning electron microscope, it was shown that with the dramatic increase of loading frequency, cause of fatigue failure changed from surface roughness defect to internal non-metallic inclusions. Fatigue life conversion model for FV520B-I were established with comprehensive use of a fitting algorithm based on the combination of experimental data and classic three-parameter-model. The fatigue life conversion coefficient for FV520B-I was proposed, whose value increased with the increasing of stress amplitude. A clear understand of the effect of loading frequency on the fatigue property of FV520B-I was given, which has a great significance in guaranteeing the accuracy of the actual fatigue analysis of FV520B-I in the remanufacturing engineering.
Key words:  ultra-high cycle fatigue    FV520B-I    loading frequency    fatigue life conversion    three-parameter-model
               出版日期:  2018-08-25      发布日期:  2018-09-18
ZTFLH:  O346.2+3  
  U467.4+97  
  TH11  
基金资助: 国家自然科学基金(51375074);中央高校基本科研业务费资助(DUT17ZD230;DUT17GF214)
通讯作者:  张元良:通信作者,男,1959年生,博士,教授,博士研究生导师,主要研究方向为可持续设计、疲劳寿命预测 E-mail:zylgzh@dlut.edu.cn   
作者简介:  赵清晨:男,1992年生,硕士,研究方向为疲劳寿命预测、可再制造性判断 E-mail:542864830@qq.com
引用本文:    
赵清晨, 王金龙, 张元良, 沈毅鸿, 刘淑杰. 不同加载频率下FV520B-I的疲劳行为与疲劳寿命[J]. 材料导报, 2018, 32(16): 2837-2841.
ZHAO Qingchen, WANG Jinlong, ZHANG Yuanliang, SHEN Yihong, LIU Shujie. Fatigue Behavior and Fatigue Life for FV520B-I at Different Loading Frequencies. Materials Reports, 2018, 32(16): 2837-2841.
链接本文:  
http://www.mater-rep.com/CN/10.11896/j.issn.1005-023X.2018.16.025  或          http://www.mater-rep.com/CN/Y2018/V32/I16/2837
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