ULTRASONIC WAVE CHARACTERIZATION OF CFRP AND NEW TECHNIQUE FOR ULTRASONIC TESTING

Ultrasonic wave propagation velocities in composite materials with laminated layers such as CFRP (Carbon Fibre Reinforced Plastic) are very difficult to measure because of differences in the velocities between resin portion and fibre portion. However, in ultrasonic testing, it is necessary to determine its velocities in all directions to detect the location of the defect. An experiment was carried out using two types of specimen, the dice (block) type and the plate type. Both specimens were manufactured from CFRP plate. In this paper, an approximate equation is proposed for propagation velocity in any direction of CFRP. Velocity in any direction can be calculated from both the velocities of 0 and 90 degree propagation angle which are can be easily measured. The difference between the calculated value and experimental value was within 10%. A new inspection method is proposed which could detect the existence of defects by audible sound converted from ultrasonic wave signals. Experimentally, the sound from defects were clearly distinguished from other noise.

• Supplemental Notes:
  • Pprs Ship Research Inst of Japan, v 32 n 3, 1995, p 1 [18 p, 5 ref, 1 tab, 30 fig]
• Authors:
  • Katsumata
  • K-i
  • Takai, M
  • Maeda, T
• Publication Date: 1995

Language

• Japanese

Subject/Index Terms

• TRT Terms: Composite materials; Fiber composites; Ultrasonic tests; Wave motion
• Subject Areas: Marine Transportation; Materials;

Filing Info

• Accession Number: 00727579
• Record Type: Publication
• Source Agency: British Maritime Technology
• Files: TRIS
• Created Date: Nov 1 1996 12:00AM