GH4169高温合金疲劳寿命非线性超声检测研究
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摘要
基于超声无损检测理论,研究金属板材弯曲疲劳引起的超声非线性波动规律,建立相对非线性超声系数β′、δ′与基波、谐波幅值定量关系。利用位错模型解释了金属材料存在晶格微缺陷或应力时,超声二阶与三阶非线性系数β、δ的变化趋势。建立非线性超声检测系统,测量GH4169高温合金板材疲劳弯曲试验过程中超声相对非线性系数β′、δ′的变化趋势。实验结果表明:随着疲劳寿命的增加,相对非线性系数单调增加。二阶与三阶相对非线性系数与疲劳寿命关系转折点分别出现在疲劳寿命80%左右和60%左右。在第一阶段相对非线性系数随着疲劳寿命单调增大,在第二阶段相对非线性系数随着疲劳寿命增加出现波动或保持不变,甚至出现下降现象。对于二阶相对非线性系数,实验曲线与位错综合模型预测数据具有较好的一致性。对于三阶相对非线性系数,实验曲线与位错偶模型预测数据具有较好的一致性。
Based on theory of ultrasonic nondestructive testing of fatigue damage in metal components,the wave rules of ultrasonic nonlinearity by fatigue are studied. The relationships of relative nonlinear coefficients β′、δ′ versus fundamental and harmonic amplitudes are determined. The dislocation models are used to expound that micro defects in metal materials cause the changes of the second and third order nonlinear coefficients. The nonlinear ultrasonic testing system is used to detect the changes of the second and third order relative nonlinear coefficients with the fatigue life of GH4169 superalloy. The results shows the relative nonlinear coefficients increase with the fatigue life. There are turning points in curves. In first stage,the relative nonlinear coefficients monotonically increase with the fatigue life. In second stage,the relative nonlinear coefficients change slowly or barely with the fatigue life. For the second order relative nonlinear coefficient,the experimental data is approximately coincident with the data predicted by the dislocation comprehensive models. For the third order relative nonlinear coefficient,the experimental data is approximately coincident with the data predicted by the dislocation dipole models.
Based on theory of ultrasonic nondestructive testing of fatigue damage in metal components,the wave rules of ultrasonic nonlinearity by fatigue are studied. The relationships of relative nonlinear coefficients β′、δ′ versus fundamental and harmonic amplitudes are determined. The dislocation models are used to expound that micro defects in metal materials cause the changes of the second and third order nonlinear coefficients. The nonlinear ultrasonic testing system is used to detect the changes of the second and third order relative nonlinear coefficients with the fatigue life of GH4169 superalloy. The results shows the relative nonlinear coefficients increase with the fatigue life. There are turning points in curves. In first stage,the relative nonlinear coefficients monotonically increase with the fatigue life. In second stage,the relative nonlinear coefficients change slowly or barely with the fatigue life. For the second order relative nonlinear coefficient,the experimental data is approximately coincident with the data predicted by the dislocation comprehensive models. For the third order relative nonlinear coefficient,the experimental data is approximately coincident with the data predicted by the dislocation dipole models.
引文
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[10]A.A.Shah,Y.Ribakov,Ch.Zhang.Efficiency and sensitivity of linear and non-linear ultrasonics to identifying micro and macro-scale defects in concrete.Materials and Design,2013(50):905-916.
[11]H.J.Yan,C.G.Xu,D.G.Xiao,H.C.Cai.Properties of GH4169 Superalloy Characterized by Nonlinear Ultrasonic.Advances in Materials Science and Engineering,2015,2015:457384.
[2]阎红娟,徐春广,肖定国.金属材料拉伸应力非线性超声特性研究[J].机械工程学报,2016,52(6):22-29.(Yan Hong-juan,Xu Chun-guang,Xiao Ding-guo.Research on nonlinear ultrasonic properties of tension stress in metal materials[J].Journal of Mechanical Engineering,2016,52(6):22-29.)
[3]T.Ohtani,K.Nishiyama,S.Yoshikawa,H.Ogic,M.Hirao.Ultrasonic attenuation and microstructural evolution throughout tension-compression fatigue of a low-carbon steel[J].Materials Science and Engineering A,2006(442):466-470.
[4]T.Kang,H.Kim,S.Song,H.K。Characterization of fatigue damage of Al6061-T6 with ultrasound,NDT&E International,2012(52):51-56.
[5]S.Vanlanduit,P.Guillaume,G.V.Linder.On-line Monitoring of fatigue cracks using ultrasonic surface waves.NDT&E International,2003(36):601-607.
[6]A.Hikata,B.B.Chick,C.Elbaum.Dislocation contribution to the second harmonic generation of ultrasonic waves[J].J.Appl.Phys,1965,36(1):229-236.
[7]W.D.Cash,W.Cai.Contribution of dislocation dipole structures to the acoustic nonlinearity[J].Journal of Applied Physics,2012(111):074906.
[8]Jianfeng Zhang,Fu-Zhen Xuan.Fatigue damage evaluation of austenitic stainless steel using nonlinear ultrasonic waves in low cycle regime[J].Journal of Applied Physics,2014(115):204906.
[9]J.H.Cantrell.Quantitative assessment of fatigue damage accumulation in wavy slip metals from acoustic harmonic generation[J].Philos.Mag.2006,86(11):1539-1554.
[10]A.A.Shah,Y.Ribakov,Ch.Zhang.Efficiency and sensitivity of linear and non-linear ultrasonics to identifying micro and macro-scale defects in concrete.Materials and Design,2013(50):905-916.
[11]H.J.Yan,C.G.Xu,D.G.Xiao,H.C.Cai.Properties of GH4169 Superalloy Characterized by Nonlinear Ultrasonic.Advances in Materials Science and Engineering,2015,2015:457384.