蜂窝共固化结构高分辨率超声C扫描方法及应用
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摘要
针对复合材料蜂窝夹芯共固化结构穿透法超声检测信号衰减严重、难以确定检出缺陷的性质和深度位置等问题,基于超声反射原理,研究了一种宽带窄脉冲高分辨率超声C扫描检测方法,并进行了检测试验。试验结果表明,该方法可以获取高质量的时域可分辨的回波信号,蒙皮-芯脱粘和好区的回波信号相差达11dB,膜上和膜下脱粘呈现不同的图像灰度分布特征,检出的脱粘大小与其设计值的差值不大于蜂窝芯格边长,可有效检测此类结构,并得到了较好的实际检测应用。
The main problems of transmission ultrasonic method for co-cured composite sandwich honeycomb structure(CCSHS)are of signal dramatic attenuation and difficulty in determination of detected defect depthlocation in skin or skin-core interface of CCSHS.In view of these problems,a high-resolution ultrasonic C-scan method,which was based on wide-band narrow-pulse ultrasonic reflection technique,was developed and used to NDT&E of CCSHS sandwiched defect quantitative evaluation.Testing and application results have demonstrated that high-quality time-resolved echo signals resulted from ultrasonic reflections in body of CCSHSs can be obtained.The signal amplitude difference between disbond and good-bonding zones is up to 11 dB approximately.The distribution characterization of imaging grey resulted from disbonds,located in upper and lower adhesive film interfaces between skin-core,is obvious different from each other.Maximum deviation of detected disbond sizes by the C-scan is not larger than a single side length of the honeycomb.It provides an efficient and powerful quantitative NDT&E method for CCSHSs.A good practical application has been obtained.
The main problems of transmission ultrasonic method for co-cured composite sandwich honeycomb structure(CCSHS)are of signal dramatic attenuation and difficulty in determination of detected defect depthlocation in skin or skin-core interface of CCSHS.In view of these problems,a high-resolution ultrasonic C-scan method,which was based on wide-band narrow-pulse ultrasonic reflection technique,was developed and used to NDT&E of CCSHS sandwiched defect quantitative evaluation.Testing and application results have demonstrated that high-quality time-resolved echo signals resulted from ultrasonic reflections in body of CCSHSs can be obtained.The signal amplitude difference between disbond and good-bonding zones is up to 11 dB approximately.The distribution characterization of imaging grey resulted from disbonds,located in upper and lower adhesive film interfaces between skin-core,is obvious different from each other.Maximum deviation of detected disbond sizes by the C-scan is not larger than a single side length of the honeycomb.It provides an efficient and powerful quantitative NDT&E method for CCSHSs.A good practical application has been obtained.
引文
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[2]刘松平.ZJJ-1智能胶接检测仪地研制[J].航空工艺技术,1991(5):26-28.
[3]刘松平,刘菲菲.先进复合材料无损检测技术[M].北京:航空工业出版社,2017.
[4]HSU D K,PETERS J J,FEI D,et al.Imaging of flaws in composite honeycomb aircraft structures using instrumented tap test[C]∥Proceedings of SPIE on Nondestructive Evaluation of Aging Materials and Composites III.Newport Beach:SPIE,1999:236-245.
[5]JONES T S,HAROLD B.Application of nondestructive inspection methods to composites[J].Materials Evaluation,1989,47(4):390-398.
[6]AYMERICH F,MEILI S.Ultrasonic evaluation of matrix damage in impacted composite laminates[J].Composites Part B:engineering,2000,31(1):1-6.
[7]JONES T S.Inspection of composites using the automated ultrasonic scanning system[J].Materials Evaluation,1985,43(5):746-753.
[8]余小毛.复合材料层板及蜂窝夹层结构的自动喷水超声穿透扫描检测[J].材料工程,1992(S1):268-270.
[9]史俊伟,刘松平,程文礼.复合材料蜂窝夹层结构制件的超声可视化无损检测[J].无损检测,2015,37(3):39-43.
[10]唐桂云,王云飞,王宝瑞.碳纤维复合材料蜂窝夹层结构的无损检测方法研究[J].纤维复合材料,2011(1):30-32.