两级复合载荷下铝合金疲劳寿命预估
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摘要
高低周或低高周复合载荷作用下的疲劳破坏广泛存在于飞机发动机等结构中。基于多机制损伤耦合模型,分别建立了高低周、低高周两级加载下金属疲劳寿命预估模型。通过LY12CZ铝合金两级加载疲劳试验对提出的低高周复合疲劳寿命预估模型进行了验证,并将其与Miner线性模型进行了对比。结果表明:提出的低高周复合疲劳寿命预估模型预测结果更为准确。
Fatigue failure under two-stage combined cycle loading is widely found in aircraft engines and other structures. Based on multi-mechanism damage coupling model,life prediction models of metal fatigue life under two-stage combined loading were established. The proposed model for low and high combined cycle fatigue was verified by experimental data on LY12CZ aluminum alloy under combined cycle loading. Comparison of the proposed model with the model based on Miner theory was also made. The results showed that the predicted life of the proposed model was better correlated with experimental data.
Fatigue failure under two-stage combined cycle loading is widely found in aircraft engines and other structures. Based on multi-mechanism damage coupling model,life prediction models of metal fatigue life under two-stage combined loading were established. The proposed model for low and high combined cycle fatigue was verified by experimental data on LY12CZ aluminum alloy under combined cycle loading. Comparison of the proposed model with the model based on Miner theory was also made. The results showed that the predicted life of the proposed model was better correlated with experimental data.
引文
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3 Jelaska D.Closed form expression for fatigue life prediction at combined HCF/LCF loading.Mechanics,Automatic Control and Robotics,2003;3(13):635-664
4赵振华,陈伟,吴铁鹰.高低周复合载荷下的钛合金疲劳寿命估算.机械强度,2011;34(4):629-632Zhao Zhenhua,Chen Wei,Wu Tieying.Fatigue life predictions of titanium alloy under high and low combined cycle loading.Journal of Mechanical Strength,2011;33(4):629-632
5幸杰,韩永典,徐连勇,等.基于连续损伤力学的高低周复合疲劳损伤.焊接学报,2017;38(7):63-66Xing Jie,Han Yongdian,Xu Lianyong,et al.High cycle and low cycle hybrid fatigue damage based on continuum damage mechanics.Transactions of the China Welding Institution,2017;38(7):63-66
6苏少普,董登科,张海英.基于Abaqus/Python的疲劳裂纹扩展分析研究.科学技术与工程,2015;15(27):193-197Su Shaopu,Dong Dengke,Zhang Haiying.Fatigue crack growth analysis based on Abaqus/Python.Science Technology and Engineering,2015;15(27):193-197
7黄博.基于FBG的结构疲劳损伤监测及损伤力学模型研究.西安:中国飞机强度研究所,2010Huang Bo.Study on structural fatigue damage monitoring based on FBG and damage mechanics model.Xi'an:Aircraft Strength Research Institute of China,2010
8 Miner M A.Cumulative damage in fatigue.Journal of Applied Mechanics,1945;12(3):A159-164
9 Xiao Y C.A multi-mechanism damage coupling model.International Journal of Fatigue,2004;26:1241-1250
10 Xiao Y C,Li S,Gao Z.A continuum damage mechanics model for high cycle fatigue.International Journal of Fatigue,1998;20(7):495-501
11高镇同.疲劳性能试验设计和数据处理.北京:北京航空航天大学出版社,1999Gao Zhentong.Experimental design for fatigue properties and data processing.Beijing:Beihang University Press,1999
2李睿,鲍蕊,费斌军.2024-T3铝合金孔板高低周复合疲劳试验研究.飞机设计,2010;30(3):18-22Li Rui,Bao Rui,Fei Binjun.Experimental investigation on combined high and low cycle fatigue performance of 2024-T3 aluminum alloy plate with hole.Aircraft Design,2010;30(3):18-22
3 Jelaska D.Closed form expression for fatigue life prediction at combined HCF/LCF loading.Mechanics,Automatic Control and Robotics,2003;3(13):635-664
4赵振华,陈伟,吴铁鹰.高低周复合载荷下的钛合金疲劳寿命估算.机械强度,2011;34(4):629-632Zhao Zhenhua,Chen Wei,Wu Tieying.Fatigue life predictions of titanium alloy under high and low combined cycle loading.Journal of Mechanical Strength,2011;33(4):629-632
5幸杰,韩永典,徐连勇,等.基于连续损伤力学的高低周复合疲劳损伤.焊接学报,2017;38(7):63-66Xing Jie,Han Yongdian,Xu Lianyong,et al.High cycle and low cycle hybrid fatigue damage based on continuum damage mechanics.Transactions of the China Welding Institution,2017;38(7):63-66
6苏少普,董登科,张海英.基于Abaqus/Python的疲劳裂纹扩展分析研究.科学技术与工程,2015;15(27):193-197Su Shaopu,Dong Dengke,Zhang Haiying.Fatigue crack growth analysis based on Abaqus/Python.Science Technology and Engineering,2015;15(27):193-197
7黄博.基于FBG的结构疲劳损伤监测及损伤力学模型研究.西安:中国飞机强度研究所,2010Huang Bo.Study on structural fatigue damage monitoring based on FBG and damage mechanics model.Xi'an:Aircraft Strength Research Institute of China,2010
8 Miner M A.Cumulative damage in fatigue.Journal of Applied Mechanics,1945;12(3):A159-164
9 Xiao Y C.A multi-mechanism damage coupling model.International Journal of Fatigue,2004;26:1241-1250
10 Xiao Y C,Li S,Gao Z.A continuum damage mechanics model for high cycle fatigue.International Journal of Fatigue,1998;20(7):495-501
11高镇同.疲劳性能试验设计和数据处理.北京:北京航空航天大学出版社,1999Gao Zhentong.Experimental design for fatigue properties and data processing.Beijing:Beihang University Press,1999