Dynamic mechanical properties of AACs under impact loading

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (18) : 201-206.

CHEN Yishun,WANG Bo,ZHOU Jiannan,KONG Xinli,ZHU Naishu,ZHOU Yinzhi

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Abstract

In order to investigate the dynamic mechanical properties of autoclaved aerated concrete (AAC) under impact loading, the AAC specimens with the density of 425 kg/m3 and 625 kg/m3 were used to carry out quasi-static mechanical tests and split Hopkinson pressure bar (SHPB) tests.In order to solve the problems of non-uniform internal stress and difficult acquisition of transmission signals in low-impedance porous materials such as AAC, the SHPB was improved by using waveform shaper and semiconductor strain gauge to ensure the validity of the tests.The mechanical parameters at different strain rates were obtained and the strength properties of AAC were studied.The results indicate that, for AAC material, the compressive strength of the specimens increases with the increase of the strain rate and density; the dynamic strength increase factors of AAC and the natural logarithm of average strain rate are of a linear relationship; there is a strain rate sensitive threshold for AAC under the impact compression state, and when the strain rate is greater than the specific strain rate threshold, the impact compression intensity increases rapidly; with the increase of the average strain rate and density, AAC’s impacting toughness goes up continuously and the impact toughness index is linear with the logarithm of the average strain rate.

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autoclaved aerated concrete (AAC) / split Hopkinson pressure bar (SHPB) / dynamic strength increase factor / strain rate sensitive threshold

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CHEN Yishun,WANG Bo,ZHOU Jiannan,KONG Xinli,ZHU Naishu,ZHOU Yinzhi. Dynamic mechanical properties of AACs under impact loading[J]. Journal of Vibration and Shock, 2019, 38(18): 201-206

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