Title :
Degradation diagnosis of polymeric materials using ultrasonic waves
Author :
Ikehara, Junichiro ; Ikeda, Takeshi ; Ashida, Tetsuya ; Fujii, Masanori
Author_Institution :
Mitsubishi Cable Ind. Ltd., Amagasaki, Japan
Abstract :
To develop a non-destructive technique for evaluating heat degradation in cable sheaths and insulation, relations between physical properties and ultrasonic wave velocity in heat degraded polymeric materials such as polyvinyl chloride, polyethylene and ethylene propylene rubber were investigated. Ultrasonic wave velocity increased while breaking elongation decreased with the heat degradation in all of the tested material. There was obvious correlation between the ultrasonic wave velocity and the breaking elongation. Using ultrasonic wave velocity, this correlation has made possible a non-destructive diagnosis for determining the degree of degradation in cable sheaths and insulation
Keywords :
cable insulation; cable sheathing; elongation; ethylene-propylene rubber; organic insulating materials; polyethylene insulation; ultrasonic materials testing; ultrasonic velocity measurement; breaking elongation; cable sheaths; degradation diagnosis; ethylene propylene rubber; heat degradation; insulation; nondestructive technique; physical properties; polyethylene; polymeric materials; polyvinyl chloride; tested material; ultrasonic wave velocity; ultrasonic waves; Cable shielding; Heating; Inspection; Insulation testing; Materials testing; Paramagnetic resonance; Plastic insulation; Polymers; Sampling methods; Thermal degradation;
Conference_Titel :
Ultrasonics Symposium, 1998. Proceedings., 1998 IEEE
Conference_Location :
Sendai
Print_ISBN :
0-7803-4095-7
DOI :
10.1109/ULTSYM.1998.765046