超声疲劳试验中载荷频率对材料疲劳性能的影响  

EFFECT OF LOAD FREQUENCY ON FATIGUE BEHAVIOR OF MATERIAL IN ULTRASONIC FATIGUE TESTING

作　　者：王弘[1] 高庆[1] 

机构地区：[1]西南交通大学应用力学与工程系,成都610031

出　　处：《理化检验（物理分册）》2005年第9期433-435,455,共4页Physical Testing and Chemical Analysis(Part A:Physical Testing)

基　　金：四川省应用基础项目基金(02GY029-028);西南交通大学科学研究项目基金(2003B19)

摘　　要：用超声高频疲劳试验方法获得的40Cr钢和50车轴钢的疲劳性能大于常规低频疲劳试验结果,表明超声加载频率对疲劳性能存在影响,这种影响可归因于应变速率的影响。采用一个超声加载频率修正系数对超声疲劳性能试验中载荷频率对疲劳性能的影响进行修正。超声加载频率修正系数近似等于常规低频疲劳条件下的疲劳强度系数与超声高频疲劳条件下的疲劳强度系数的比值,该修正系数也可通过不同应变速率下材料的断裂强度的比值来近似地确定。Fatigue behavior of 40Cr steel obtained by ultrasonic high-frequency fatigue testing method is usually larger than that by conventional low frequency testing. The effect of load frequency on fatigue behavior of the material can be ascribed to the effect of load strain rate. A modifying coefficient of load frequency is used to describe the effect of load frequency on fatigue behavior in ultrasonic fatigue testing. The modifying coefficient equals the ratio of fatigue strength coefficient of lower frequency load and high frequency load. And it can be determined approximately by the ratio of the tensile strength of the material at various high strain rates.

关 键 词：超声疲劳 疲劳性能 载荷频率 频率修正系数 

分 类 号：TG115.9[金属学及工艺—物理冶金]