Effect of strain on charging phenomena of triboelectrification with ice specimens

When a couple of ice specimens was asymmetrically rubbed together, at a beginning of rubbing term a specimen with a hot spot was charged negatively against the other specimen with a cold spot. On more rubbing with their specimens the hot spot strained by friction force get harder spot with polycrystallized face and at the same time electric potential of the specimen with the hot spot changed from negative to positive. On the basis of the above face, the present paper describes results obtained on frictional experiments using a strained specimen and a normal specimen. As a result, it was obtained the conclusions as follows: The more strained specimen, the more a specimen got to charge positively.