冲击载荷作用下蒸压加气混凝土动态力学性能研究

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振动与冲击 ›› 2019, Vol. 38 ›› Issue (18) : 201-206.

论文

陈艺顺，王波，周健南，孔新立，朱乃姝，周寅智

作者信息 +

Dynamic mechanical properties of AACs under impact loading

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

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文章历史 +

摘要

为了研究蒸压加气混凝土（AAC）在冲击载荷作用下的动态力学性能，对密度为425〖kg/m〗^3和625〖kg/m〗^3的试件进行了准静态力学测试和分离式Hopkinson压杆（SHPB）试验。针对蒸压加气混凝土这类低阻抗多孔介质材料试件内部应力不均匀和透射信号难采集的问题，采用波形整形器和半导体应变片对SHPB装置进行了改进，保证了试验的有效性。试验得到了不同应变速率下的力学参数，并在此基础上研究了蒸压加气混凝土的强度性能。结果表明，蒸压加气混凝土的抗压强度随应变速率和密度的增加而增大；蒸压加气混凝土的动态强度增长因子与平均应变率的自然对数成线性关系；在冲压状态下蒸压加气混凝土存在应变率敏感阀值，当应变率超过这个值时，试件的抗压强度将明显增加；随着平均应变率和密度的增加，蒸压加气混凝土的冲击韧性不断增加且冲击韧性指标与平均应变率的对数呈线性关系。

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.

导出引用

陈艺顺，王波，周健南，孔新立，朱乃姝，周寅智. 冲击载荷作用下蒸压加气混凝土动态力学性能研究[J]. 振动与冲击, 2019, 38(18): 201-206

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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