Non-Contact Ultrasound for Composites Inspection
作者单位：The Ultran Group Inc. State College Aurora Flight Sciences
会议名称：《2017远东无损检测新技术论坛》
会议日期：2017年
学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学]
关 键 词：Non-Contact Ultrasound composites inspection prepreg in-line inspection
摘 要：Uncured and continuously produced materials often cannot afford exposure to testing device via contact or be immersed in liquid *** makes conventional contact and immersion ultrasound（UT）poorly suited for ***,UT is highly desirable for inspection of uncured composite materials as amplitude and time of flight measurements often reveal vital material *** in non-contact ultrasound（NCU）now allow efficiency comparable to conventional ultrasound for certain *** at frequencies from 30 k Hz to 5 MHz,NCU can be used to relate signal measurements directly to material properties in materials such as fiber-based composite prepreg and most cured and uncured composites.A safe and non-destructive measurement process of relatively low cost,non-contact ultrasound presents opportunities to lower cost,reduce and identify waste,and improve production *** relationships exist between ultrasonic amplitude in non-contact through transmission and key material properties such as porosity,delamination,and homogeneity in *** converting amplitude and velocity measurements into material property values through characterization formulas（*** of impregnation=[ultrasonic amplitude*x]+y）,one can apply standard methods of manufacturing process control to hold production processes within desired control limits with real-time *** such measurements to webline material positions allows direct identification of sections of undesirable material,reducing waste and improving manufacturing yields by avoiding unnecessary disposal of uninspected *** multiple points of measurement（multiple channels）in the cross-web direction allows for up to 100%inspection and high accuracy of spatial identification on finished products.