复合材料层压结构超声相控阵检测的缺陷定量表征

摘要

使用便携式超声相控阵设备及两个几何参数不同的线性阵列换能器对埋有ϕ6 mm和ϕ9 mm 人工缺陷的碳纤维复合材料层压板试块进行检测，分别进行了非聚焦线性扫查和聚焦线性扫查，并对 C 扫成像进行分析。结果表明：在非聚焦线性扫查情况下，其扫查缺陷尺寸的准确性与换能器晶元长度和孔径长度有紧密关系，试验结果与理论分析一致；而在聚焦线性扫查情况下，其扫查缺陷尺寸的准确性不再受孔径数过大的影响。%In this paper,a portable phased array ultrasonic device and two linear array transducers with different geometric parameters are utilized to detect the ϕ 6 mm and ϕ 9 mm defects in a carbon fiber composite laminate. Non-focusing linear scan and focusing linear scan are adopted,respectively,and C scan image is shown to study and analysis.The experiment reveals that in the case of non-focusing linear scan,the accuracy of the size of defects has a close relation with the lengths of the element and aperture.The experiment results show good agreements with theoretical analysis;but in the case of focusing linear scan,the accuracy of the defect size is not affected by the overlarge aperture.