在航空复合材料层压板机械钻孔加工中,分层损伤是影响钻孔连接装配性以及材料使用寿命最严重的一类缺陷.超声相控阵因其检测速度快、灵活性好、结果显示直观等优势被广泛应用于复合材料缺陷检测研究中.为了提高相控阵检测复合材料分层缺陷的检出率和成像质量,研究了阵元数、焦距、脉冲宽度分别对成像检测结果的影响,获得了各参数变化的影响规律及钻孔分层缺陷相控阵成像检测各参数最优设置,为后续利用相控阵技术开展航空复合材料层压板钻孔分层缺陷检测方法研究提供参考.
In the drilling machining process of aeronautical carbon fiber composite laminate,layer defect is one of the most serious detections,which effects the connection of assembly and its using life.Ultrasonic phased array is widely used in detecting aeronautical composite defects because of its efficiency,flexiblity,intuitive display and so on.Aiming at improving the detection rate and imaging quality of drilling-induced delamination in composite laminates,this article mainly studied the effects of aperture,focal length and pulse width on results of detecting imaging by controlling variate method,then obtained the regular pattern of parameter changing and the most suitable install of each parameter.When the number of elements was too small,the focus beam length was too short.So it affects the detection rate of stratified defects and makes the defect information seriously distorted.With the number of elements under the same circumstances,the maximum amplitude of defect increased and then decreased with the depth of focus increasing.When the pulse width of the element excitation was about half of the center frequency,detection effect was optimal.This paper supplies reference to the following detection and study of drilling-induced delamination in composite laminates.
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