Experimental study on stress wave propagation in ultra high toughness cementitious composites

被引：0
|
作者：
Li Q.-H. [1 ]
Shu C.-L.-Q. [1 ]
机构：
[1] College of Civil Engineering and Architecture, Zhejiang University, Hangzhou
来源：
Zhejiang Daxue Xuebao (Gongxue Ban)/Journal of Zhejiang University (Engineering Science) | 2020年 / 54卷 / 05期
关键词：
Attenuation; Stress wave; Ultra high toughness cementitious composite (UHTCC); Wave speed; Zhu-Wang-Tang constitutive model;
D O I：
10.3785/j.issn.1008-973X.2020.05.002
中图分类号：
学科分类号：
摘要：
The ultra high toughness cementitious composite (UHTCC) specimens were loaded with Hopkinson bar, and the stress wave signals in UHTCC under impact pressure of 0.2, 0.3, 0.4, 0.5 MPa were measured, in order to study the propagation characteristics of stress waves in UHTCC. The consistency of the loading waveforms under the same loading conditions was verified by comparing the incident bar waveforms. The stress wave speeds in UHTCC under different impact pressures were calculated by two methods, i.e. two point method and peak value method. Results show that the two point method is more applicable and the calculation results are relatively stable. However, the peak value method requires similar wave impedance of the incident bar and the specimen. Calculation results show that the stress wave speed and attenuation coefficient in UHTCC do not change significantly with the impact pressure, and the average wave speed is 3.060 km/s, as well as the average attenuation coefficient is 2.775 m-1. The wave speed and attenuation of stress waves in material can be expressed by parameters of Zhu-Wang-Tang constitutive model. Correspondingly, the measured wave speed and attenuation coefficient can represent the Zhu-Wang-Tang impact constitutive model of UHTCC as an equation with a single quasi-static parameter. An experimental method to determine the dynamic constitutive of UHTCC directly is provided. © 2020, Zhejiang University Press. All right reserved.
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页码：851 / 857and908
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