N80Q钢的低周疲劳特性及寿命预测
Low Cycle Fatigue Characteristics and Life Prediction of N80Q Steel
摘 要
在Instron 8862型疲劳试验机上对油井套管用N80Q钢进行完全对称循环载荷（平均应变为0）和非对称循环载荷（平均应变为0.5%和1.0%）下的低周疲劳试验，研究该钢的低周疲劳特性，并讨论了考虑不同因素的低周疲劳寿命模型的预测精度。结果表明：塑性应变能随应变幅的增大呈线性增长趋势，平均应变对塑性应变能几乎无影响；在对称载荷、不同应变幅（0.5%~2.0%）下以及非对称载荷、应变幅大于1.0%下，N80Q钢均无应力松弛行为，而在非对称载荷、应变幅小于1.0%时出现明显的应力松弛行为，且初始平均应力越大，应力松弛行为越明显；考虑最大应力、应力范围、应变范围以及平均应变影响的经验模型的预测精度较高，预测寿命主要分散在1.2倍分散带内。
平均应变
应力松弛
疲劳寿命预测
low cycle fatigue characteristic
mean strain
stress relaxation
fatigue life prediction
Abstract
Low cycle fatigue tests of N80Q steel for oil well casing were carried out on Instron 8862 fatigue tester under complete symmetrical cycle loads (mean strain of 0) and non-symmetrical cycle loads (mean strain of 0.5% and 1.0%). The low cycle fatigue characteristics of the steel were studied, and the prediction accuracy of low cycle fatigue life models considering different factors was discussed. The results show that the plastic strain energy increased linearly with increasing strain amplitude, and the mean strain had little effect on the plastic strain energy. There was no stress relaxation behavior of N80Q steel under different strain amplitudes (0.5%-2.0%) and symmetric load or under strain amplitude greater than 1.0% and asymmetric load. When the strain amplitude was less than 1.0% under asymmetric load, the stress relaxation behavior was obvious; the larger the initial mean stress, the more obvious the stress relaxation behavior. The empirical model considering the influence of maximum stress, stress range, strain range and mean strain had higher prediction accuracy, and the predicted lives were mainly dispered in 1.2 time scatter band.
中图分类号 TG115.5 DOI 10.11973/jxgccl202109014
所属栏目 材料性能及应用
基金项目 国家自然科学基金资助项目（51901180）；国家重点研发计划项目（2019YFF0217504）
收稿日期 2020/7/13
修改稿日期 2021/6/2
网络出版日期
作者单位点击查看
备注崔璐(1979-),女,陕西西安人,教授,博士
引用该论文: CUI Lu,WU Peng,YANG Chenghui,KANG Wenquan,LI Zhen,WEI Wenlan,WANG Peng. Low Cycle Fatigue Characteristics and Life Prediction of N80Q Steel[J]. Materials for mechancial engineering, 2021, 45(9): 73～78
崔璐,吴鹏,杨程晖,康文泉,李臻,魏文澜,王澎. N80Q钢的低周疲劳特性及寿命预测[J]. 机械工程材料, 2021, 45(9): 73～78
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参考文献
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【2】冯耀荣, 杨龙, 李鹤林. 石油管失效分析预测预防与完整性管理[J]. 金属热处理, 2011, 36(增刊1):15-16. FENG Y R, YANG L, LI H L. Failure analysis prediction & prevention and integrity management[J]. Heat Treatment of Metals, 2011, 36(1):15-16.
【3】李鹤林, 韩礼红, 张文利.高性能油井管的需求与发展[J].钢管, 2009, 38(1):1-9. LI H L, HAN L H, ZHANG W L.Demand and development of hi-performance OCTG[J].Steel Pipe, 2009, 38(1):1-9.
【4】WEI W L, HAN L H, FENG Y R, et al. Low cycle fatigue behavior of N80Q steel under the influence of mean strains[J]. Materials Science Forum, 2019, 944:1067-1075.
【5】MORROW J. Fatigue design handbook:Advances in engineering[M]. Warrendale, PA:Society of Automotive Engineers, 1968:21-29.
【6】OHJI K, MILLER W R, MARIN J. Cumulative damage and effect of mean strain in low cycle fatigue of a 2024-T351 aluminum alloy[J]. Journal of Basic Engineering, 1966, 88(4):801-810.
【7】张孝忠, 王恭义, 程凯, 等.一种考虑平均应力松弛的汽轮机叶根低周疲劳寿命预测方法[J].材料科学与工程学报, 2019, 37(5):709-713. ZHANG X Z, WANG G Y, CHENG K, et al.LCF Life prediction method of turbine blade roots considering mean stress relaxation effect[J].Journal of Materials Science and Engineering, 2019, 37(5):709-713.
【8】DOWLING N E.Mean stress effects in strain-life fatigue[J].Fatigue and Fracture of Engineering Materials and Structures, 2009, 32(12):1004-1019.
【9】SALERNO G, MAGNABOSCO R, NETO C D M. Mean strain influence in low cycle fatigue behavior of AA7175-T1 aluminum alloy[J]. International Journal of Fatigue, 2007, 29(5):829-835.
【10】ZHU S P, LEI Q, HUANG H Z, et al. Mean stress effect correction in strain energy-based fatigue life prediction of metals[J]. International Journal of Damage Mechanics, 2016, 26(8):1219-1241.
【11】苏运来, 陆山.适用于任意应变比的应变寿命新模型[J].推进技术, 2018, 39(1):169-175. SU Y L, LU S.A new strain-life model accounting for effects of various strain ratios[J].Journal of Propulsion Technology, 2018, 39(1):169-175.
【12】ELLYIN F. Effect of tensile-mean-strain on plastic strain energy and cyclic response[J]. Journal of Engineering Materials and Technology, 1985, 107(2):119-125.
【13】TAO G, XIA Z H.Mean stress/strain effect on fatigue behavior of an epoxy resin[J].International Journal of Fatigue, 2007, 29(12):2180-2190.
【14】KOH S K, OH S J, LI C, et al. Low-cycle fatigue life of SiC-particulate-reinforced Al-Si cast alloy composites with tensile mean strain effects[J]. International Journal of Fatigue, 1999, 21:1019-1032.
【15】BEGUM S, CHEN D L, XU S, et al.Strain-controlled low-cycle fatigue properties of a newly developed extruded magnesium alloy[J].Metallurgical and Materials Transactions A, 2008, 39(12):3014-3026.
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【17】ZHUANG W Z, HALFORD G R.Investigation of residual stress relaxation under cyclic load[J].International Journal of Fatigue, 2001, 23(S1):31-37.
【18】张仕朝, 李旭东. 铸造钛合金ZTC4不同应变比下的低周疲劳行为[J]. 材料热处理学报, 2020, 41(2):142-146. ZHANG S C, LI X D.Low cycle fatigue behavior of cast titanium alloy ZTC4 at different strain ratios[J]. Transactions of Materials and Heat Treatment, 2020, 41(2):142-146.
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【21】KUN F, CARMONA H A, ANDRADE J S, et al.Universality behind basquin's law of fatigue[J].Physical Review Letters, 2008, 100(9):094301.
【22】MANSON S S.Fatigue:A complex subject-Some simple appro-ximations[J].Experimental Mechanics, 1965, 5(4):193-226.
【23】陈宏, 蒋洪德.一种镍基单晶合金高温低周疲劳寿命预测方法[J].机械强度, 2015, 37(5):857-862. CHEN H, JIANG H D. Low cycle fatigue life prediction method or single crystal nickel-bace super alloys at high temperature[J].Journal of Mechanical Strength, 2015, 37(5):857-862.
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