Yasumoto Sato

Detection of Delamination in GFRP and CFRP by Microwaves with Focusing Mirror Sensor

A technique to detect delamination in composite materials by noncontact, rapid and high sensitive microwave reflectometry with a focusing mirror sensor was proposed. The focusing mirror sensor, which has high sensitivity and resolution, is expected to detect delamination sensitively. In this paper, the ability of microwave inspection to detect delamination in glass fiber reinforced plastic (GFRP) and carbon fiber reinforced plastic (CFRP) was verified. As the results, the existences of 100 μm thick delamination in 3 mm thick GFRP laminate and 2 mm thick CFRP laminate were detected.

CONTINUOUS MONITORING OF STRESS CORROSION CRACKING GROWTH IN TYPE 316L STAINLESS STEEL WELDMENT USING INDUCED CURRENT POTENTIAL DROP TECHNIQUE AT ELEVATED TEMPERATURE

In this study, induced current potential drop (ICPD) technique was applied to monitor SCC crack growth. The SCC crack monitored was introduced on the internal wall of a pipe specimen in which simulated BWR water flows. The measurement was performed on the external wall of the pipe specimen. It was shown that the ICPD technique permits continuous monitoring of the SCC growth, which initiates from the inner wall of the pipe specimen under elevated temperature.