| 应力梯形波加载下的循环蠕变曲线函数 |
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| 引用本文： | 于强.应力梯形波加载下的循环蠕变曲线函数[J].四川理工学院学报(自然科学版),2013,26(3):80-86. |
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| 作者姓名： | 于强 |
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| 作者单位： | 四川理工学院理学院,四川自贡,643000 |
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| 摘 要： | 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870oC、梯形应力波加载下蠕变实验数据的支持。
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| 关 键 词： | 蠕变实验 循环蠕变曲线 应力梯形波 高温合金 |
Ascertainment of Cycle Creeping Function Under Stress Control of Trapezium Waveforms |
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| YU Qiang.Ascertainment of Cycle Creeping Function Under Stress Control of Trapezium Waveforms[J].Journal of Sichuan University of Science & Engineering:Natural Science Editton,2013,26(3):80-86. |
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| Authors: | YU Qiang |
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| Affiliation: | YU Qiang(School of Science,Sichuan University of Science & Engineering,Zigong 643000,China) |
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| Abstract: | 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. |
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| Keywords: | creep test cycle-creep curve stress trapezium waveform superalloy |
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