摘要
近来的研究表明［１，２］，Ｃｏｒｔｅｎ－Ｄｏｌａｎ损伤公式中的指数ｄ可能不简单地是一个材料常数，它不但与材料有关，而且还与载荷谱的水平有关，不同的载荷谱将对应不同的ｄ值。ｄ值可由二级循环载荷的程序疲劳试验来确定。本文依据Ｃｏｒｔｅｎ－Ｄｏｌａｎ公式的导出原理，探讨了应用二级循环载荷的程序疲劳试验确定ｄ值的具体方法，提出了确定二级循环载荷参数的原则。最后给出应用二级载荷程序试验法确定ｄ值的具体实例。结果表明，应用本文方法求得的ｄ值及估算的疲劳寿命与试验结果符合的很好。
Recent researchs shown that the exponent'd'of the Corten-Dolan's formular is not simply a materialconstant.It depends not only upon the materials,but also upon the levels of the load spetrum,and its value can bedetermined through a two-level-load programed test.In this paper,the particular details of the test have been discussedbased on the deduction of the Corten-Dolan's formular and the principles of determining the test parameters porposed.Finaly,several examples using the programed test to determine the exponent'd' have been given.The results shown thatthe fatigue lives predicted using the Corten-Dolan's formular and the'd' value obtained by the present method agreed wellwith the experimented ones.
出处
《机械强度》
CAS
CSCD
北大核心
1996年第1期21-24,共4页
Journal of Mechanical Strength
关键词
疲劳
疲劳试验
寿命估算
fatigue,fatigue test,life estimation
