国产钢材LYP225的低周疲劳试验研究

发布时间：2018-08-23 08:40

【摘要】：目前,对于低屈服点钢材的低周疲劳性能试验的研究不多。对两组不同尺寸的国产低屈服点LYP225钢材进行低周循环加载试验,研究其循环骨架曲线、滞回环特点、低周疲劳寿命等特性;同时探讨长细比对低屈服点钢材疲劳寿命的影响。通过Ramberg-Osgood模型对不同应变幅加载下的滞回环进行拟合,得出钢材循环骨架曲线;通过Coffin-Manson模型拟合得到钢材的低周疲劳寿命S-N(应变-寿命)曲线;通过试验数据确立了混合强化参数并将其输入ABAQUS软件中,所得结果能很好地模拟LYP225钢材的滞回曲线。试验结果表明:国产LYP225钢材滞回环饱满,表现出良好的延性,低周疲劳特性好于国外相同试样尺寸的同等级钢材;国产LYP225钢材低周疲劳寿命受试样长细比的影响较大,相同应变幅下,长细比越大其低周疲劳寿命越低;通过试验数据拟合得到的强化参数可用于构件在整体结构中的地震反应分析。
[Abstract]:At present, there are few researches on low cycle fatigue properties of low yield point steels. Two groups of domestic low yield point LYP225 steels with different sizes were tested under low cycle loading. The cyclic skeleton curve, hysteresis loop characteristics, low cycle fatigue life and so on were studied, and the effect of aspect ratio on fatigue life of low yield point steel was also discussed. The cyclic skeleton curve of steel was obtained by fitting the hysteresis loop under different strain amplitudes by Ramberg-Osgood model, S-N (strain life) curve of steel under low cycle fatigue life was obtained by Coffin-Manson model. The mixed strengthening parameters are established by experimental data and input into ABAQUS software. The results can well simulate the hysteretic curves of LYP225 steels. The test results show that domestic LYP225 steel has good ductility and good ductility, and its low cycle fatigue characteristic is better than the same grade steel of the same specimen size in foreign countries, and the low cycle fatigue life of domestic LYP225 steel is greatly affected by the aspect ratio of sample. At the same strain amplitude, the lower cycle fatigue life is with the increase of slenderness ratio, and the strengthening parameters obtained by fitting the experimental data can be used to analyze the seismic response of members in the whole structure.
【作者单位】：南京工业大学;中国建筑科学研究院;
【基金】：“十二五”国家科技支撑计划(2012BAJ07B02)
【分类号】：TU511.3

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