Mechanical-Electrical Response Characteristics of 2-2 Type Cement-Based Piezoelectric Composites under Impact Loading

Abstract

Abstract: The mechanical-electrical response characteristics of 2-2 type cement-based piezoelectric composites under impact loading by using the split Hopkinson pressure bar were studied. With the help of ultra-high-speed photography technology, the sample morphological failure was observed. The results indicate that piezoelectric composites have obvious strain rate effect under impact loading and they are strain rate sensitive materials. There is a threshold value of mechanical-electrical response of composites. When the stress is less than the threshold value, there is a good linear relationship between the electrical signal of sample and the applied loading. The dynamic increase factor effectively describes the rate-effect law of compressive strength of composites. In the linear range, with the increase of strain rate, the dynamic increase factor increases and grows with stable growth rate. Based on the Maxwell model, the stress relaxation time of piezoelectric composites decreases monotonously with the increase of strain rate. Under impact loading, the electrical failure of 2-2 type cement-based piezoelectric composites and piezoelectric ceramics occurs before their mechanical failure. All of their morphologies are "explosive" fragmentation and there is obvious arc discharge phenomenon for the piezoelectric ceramics.

Key words: cement-based piezoelectric composite, split Hopkinson pressure bar, impact loading, damage morphology, mechanical-electrical response, sensitivity

CLC Number:

TB332

CHENG Wenjie, LIU Xinke, XUE Wen, FENG Pengju, ZHANG Long, LI Yi, CHEN Jiangying. Mechanical-Electrical Response Characteristics of 2-2 Type Cement-Based Piezoelectric Composites under Impact Loading[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(4): 1079-1087.

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