复合材料工件缺陷漏检的原因分析

摘要

利用X射线数字成像技术检测复合材料工件的内部质量，在相隔90°、两次检测时有缺陷漏检情况发生。借助于X射线层析成像(CT)技术，分析产生漏检的原因。结果表明，该复合材料工件存在检测不到夹杂缺陷的四个角度范围，分别是55°～60°，120°～125°，230°～235°，305°～307°，从检测的DR图像中不能发现缺陷，只能看见标记物，将工件准确旋转90°进行第二次检测，则能够发现标记物和缺陷；如果旋转的角度小于90°(在60°～77°范围内)或者旋转的角度大于90°(在105°～115°范围内)，则从检测DR图像中观察不到缺陷，只能看见标记物，所以在进行第二次检测时，旋转角度不应为60°～77°或者105°～115°。%The use of X-ray digital imaging technology was used to detect internal quality of the composite workpieces, separated by 90°. Twicedetection had defects omission. By means of X-ray tomography (CT) technology, the undetected causes were analyzed. The results show that the inclusion defects in the composite workpieces should not be detected in four angle ranges,which are 55°~60°,120°~125°,230°~235°,305°~307°,defects can not be found from the detected image of digital radiography(DR), only to see the markers. But the workpiece is rotated 90°accurately in the second detection,markers and defects can be found . If the rotation angle is less than 90° (in the range of 60°~77°) or greater than 90° (in the range of 105°~115°),defect is not observed from the DR images except visible marker. So during the second test,the rotation angle should not be 60°~77° or 105 °~115°.