应力梯形波加载下的循环蠕变曲线函数

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In order to ascertain the relationships between cycle-creep strain and on-load time, by analysis of the high temperature alloy-creep curve, the life percentage of creep curve has been found to obey the rule that it is irrelevant to on-load stress and curve of cycle-creep percentage of life are almost superposed. The rule has demonstrated one of the creeping properties of material in cycle creeping behavior. Based on it, an equation of a function about creep strain curve and cycle-creep curve can be derived. Therefore, a method of ascertaining cycle-creep function by creep strain function is found. It is supported by cycle-creep test data of superalloy steel DZ417G at 870 ℃ under stress control of trapezium waveforms.为了确定循环蠕变应变与有载时间的函数关系式，通过对高温合金蠕变试验曲线的分析，发现静蠕变寿命分数曲线遵循与加载应力的大小无关，与循环蠕变寿命分数曲线基本重合的规律，这规律显示了材料本身的蠕变特性。由这规律导出了静蠕变应变与循环蠕变应变之间的关系式，找到了由静蠕变函数确定循环蠕变函数的方法，该方法得到了DZ417G高温合金钢在870℃、梯形应力波加载下蠕变实验数据的支持。