Accession Number : ADA114072

Title :   Application of Ultrasonic 'F-Scan' to the Inspection of Composite Materials.

Descriptive Note : Final rept.,

Corporate Author : DREXEL UNIV PHILADELPHIA PA ULTRASONICS RESEARCH LAB

Personal Author(s) : Rose,Joseph L ; Nestleroth,J Bruce ; Negahban,Shahab

PDF Url : ADA114072

Report Date : 15 Apr 1982

Pagination or Media Count : 45

Abstract : Composites are now being used in high strength, low weight applications such as the aircraft industry. Difficulties arise in the nondestructive testing and evaluation of these materials because of their fibrous nature. The traditional ultrasonic C-scan technique is often found very limiting. A new technique called F-scanning (Feature scanning) was developed that examines many features (characteristics) of the ultrasonic wave form such as amplitude ratios and frequency shifts. These features can be better used to locate defects. This technique was used to evaluate a composite patch that had severe void content. Photomicrographs were used to determine defective and non-defective areas for correlation with the results obtained in the F-cap process. These results showed an overall index of performance of 87.5 percent correct decisions. (Author-PL).

Descriptors :   *COMPOSITE MATERIALS, Nondestructive testing, Ultrasonics, Scanning, Defects(Materials), Physical properties, High strength, Stiffness, Sensitivity, Photomicrography, Inspection

Subject Categories : Laminates and Composite Materials
      Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE