基于非线性超声波的疲劳损伤检测试验研究
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摘要
对完整铝板、含孔铝板以及用复合材料补片修补后的铝板分别进行疲劳试验和非线性超声波检测试验,提取三组试件不同疲劳周期下的基波幅值和二次谐波幅值,得到其相对二阶超声非线性系数,并拟合出相对二阶超声非线性系数随疲劳周期变化的曲线图,以研究相对二阶超声非线性系数与疲劳损伤过程的对应关系。结果表明:随着疲劳周期增加,三组试件的相对二阶超声非线性系数均呈现先缓慢上升,然后快速上升并到达峰值,最后下降的趋势,这与疲劳损伤过程中位错和裂纹的产生及扩展过程相一致;同时发现:孔损伤会加剧微裂纹向宏观裂纹的过渡,而用复合材料补片修补孔损伤可减缓裂纹的扩展。
The fatigue testing and nonlinear ultrasonic testing are carried out on the complete aluminum plates,the aluminum plates containing the hole and the aluminum plates repaired with the composite patches. The amplitudes of fundamental ultrasonic and the second harmonic of the three sets of specimens under different fatigue cycles areextracted. The relative second-order ultrasonic nonlinear coefficients are obtained,and the graph of the relative second-order ultrasonic nonlinear coefficient with the fatigue cycles is fitted to study the corresponding relationship between the relative second-order ultrasonic nonlinear coefficients and the fatigue damage process. The results show that with the increase of fatigue cycles,the second-order ultrasonic nonlinear coefficients of the three sets of specimens show a slow rise first,then rise rapidly and reach the peak value,and finally decrease,which is consistent with the process of dislocation and crack generation and propagation during fatigue damage. At the same time,it is found that the pore damage will aggravate the transition of microcracks to macroscopic cracks,while repairing pore damage with composite patches can slow crack propagation.
The fatigue testing and nonlinear ultrasonic testing are carried out on the complete aluminum plates,the aluminum plates containing the hole and the aluminum plates repaired with the composite patches. The amplitudes of fundamental ultrasonic and the second harmonic of the three sets of specimens under different fatigue cycles areextracted. The relative second-order ultrasonic nonlinear coefficients are obtained,and the graph of the relative second-order ultrasonic nonlinear coefficient with the fatigue cycles is fitted to study the corresponding relationship between the relative second-order ultrasonic nonlinear coefficients and the fatigue damage process. The results show that with the increase of fatigue cycles,the second-order ultrasonic nonlinear coefficients of the three sets of specimens show a slow rise first,then rise rapidly and reach the peak value,and finally decrease,which is consistent with the process of dislocation and crack generation and propagation during fatigue damage. At the same time,it is found that the pore damage will aggravate the transition of microcracks to macroscopic cracks,while repairing pore damage with composite patches can slow crack propagation.
引文
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[15]Nam T,Lee T,Kim C,et al. Harmonic generation of an obliquely incident ultrasonic wave in solid-solid contact interfaces[J]. Ultrasonics,2012,52(6):778-783.
[16]何梅洪.基于超声的复合材料构件疲劳损伤检测与评价研究[D].天津:天津工业大学,2016.
[2]汪星明,郭耀红,朱庆友,等.复合材料无损检测研究进展[J].玻璃钢/复合材料,2012(1):261-265.
[3]王宝瑞,丁新静.纤维增强复合材料的无损探伤技术探讨[J].玻璃钢/复合材料,2014(4):91-94.
[4]Punnose S,Mukhopadhyay A,Sarkar R,et al. Characterisation of microstructural damage evolution during tensile deformation of a near-αtitanium alloy:Effects of microtexture[J]. Materials Science&Engineering A,2014,607(12):476-481.
[5]Kim J,Song D G,Jhang K Y. A method to estimate the absolute ultrasonic nonlinearity parameter from relative measurements[J]. Ultrasonics,2017,77:197.
[6]Zhang M,Li X,Qu W,et al. Damage detection of fatigue cracks under nonlinear boundary condition using subharmonic resonance[J]. Ultrasonics,2017,77:152-159.
[7] Rauter N,Lammering R,Kühnrich T. On the detection of fatigue damage in composites by use of second harmonic guided waves[J].Composite Structures,2016,152:247-258.
[8]颜丙生,刘自然,张跃春,等.非线性超声检测镁合金早期疲劳的试验研究[J].机械工程学报,2013,49(4):20-24.
[9]万楚豪,刚铁,刘斌,等.高速铁路钢轨疲劳过程的超声非线性系数表征[J].中国铁道科学,2015,36(5):75-79.
[10]Valluri J S,Balasubramaniam K,Prakash R V. Creep damage characterization using non-linear ultrasonic techniques[J]. Acta Materialia,2010,58(6):2079-2090.
[11]Masurkar F A,Yelve N P. Optimizing location of damage within an enclosed area defined by an algorithm based on the Lamb wave response data[J]. Applied Acoustics,2017,120(C):98-110.
[12]Yun D,Kim J,Jhang K Y. Imaging of contact acoustic nonlinearity using synthetic aperture technique[J]. Ultrasonics,2013,53(7):1349-1354.
[13]阎红娟.金属构件疲劳损伤非线性超声检测方法研究[D].北京:北京理工大学,2015.
[14]胡海峰.板状金属结构健康监测的非线性超声理论与关键技术研究[D].长沙:国防科学技术大学,2011.
[15]Nam T,Lee T,Kim C,et al. Harmonic generation of an obliquely incident ultrasonic wave in solid-solid contact interfaces[J]. Ultrasonics,2012,52(6):778-783.
[16]何梅洪.基于超声的复合材料构件疲劳损伤检测与评价研究[D].天津:天津工业大学,2016.