Accession Number : ADA119996

Title :   Nondestructive Evaluation of Metal Matrix Composites.

Descriptive Note : Final rept. 1 Oct 80-31 Dec 81,


Personal Author(s) : Schramm,Scott W ; Daniel,I M

PDF Url : ADA119996

Report Date : May 1982

Pagination or Media Count : 141

Abstract : The objective of the program was to apply nondestructive evaluation (NDE) methods to assess the integrity of FP/magnesium composites. The material investigated was ZE41A magnesium alloy reinforced with FP (aluminum oxide) fibers. The 21 specimens were evaluated using ultrasonic scanning, wave propagation velocity, wave attenuation, and X-ray radiograph inspection techniques. After the NDE inspections were completed, a representative specimen from each of the seven groups was sectioned and micrographs were made for comparison with the NDE records. It was found that ultrasonic scanning using a 15 MHz compression wave, focused transducer operated in the pulse-echo mode generating an analog C-scan gave the best results. The wave attenuation and wave propagation velocity measurements were found to be very consistent with the ultrasonic C-scans, but X-ray radiography was useful only at locations of gross material defect. (Author)

Descriptors :   *Composite materials, *Fracture(Mechanics), *Defects(Materials), *Nondestructive testing, Metals, Matrix materials, Structural analysis, Radiography, Wave propagation, Physical properties, X rays, Ultrasonics, Inspection, Microstructure, Thickness, Fiber reinforced composites, Aluminum oxides, Magnesium

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

Distribution Statement : APPROVED FOR PUBLIC RELEASE