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.
Qing-hua LI,Cheng-lan-qing SHU. Experimental study on stress wave propagation in ultra high toughness cementitious composites. Journal of ZheJiang University (Engineering Science), 2020, 54(5): 851-857.
Fig.1Experimental device of stress wave propagation in UHTCC
Fig.2Comparison of measured waveforms on incident bar
Fig.3Waveforms under different impact pressures
I/MPa
?L/mm
?t/μs
C/(km·s?1)
C0/(km·s?1)
0.18
300
97.8
3.067
3.074
0.20
300
102.4
2.930
0.25
300
93.0
3.226
0.30
300
102.6
2.924
3.037
0.30
300
94.8
3.165
0.30
300
102.4
2.930
0.30
300
105.6
2.841
0.33
300
90.2
3.326
0.40
300
102.2
2.935
3.076
0.40
300
86.6
3.464
0.40
300
104.4
2.874
0.40
300
99.0
3.030
0.45
300
96.4
3.112
3.062
0.50
300
97.2
3.086
0.50
225
66.2
3.399
0.50
300
105.2
2.852
0.50
300
104.8
2.863
Tab.2Wave velocity calculation table calculated by two point method
I/MPa
UI/V
UR/V
C2/（km·s?1）
0.18
0.637 60
?0.574 7
1.263 8
0.18
0.127 30
?0.121 8
0.538 0
0.25
0.216 10
?0.191 8
1.449 5
0.30
2.538 40
?2.292 2
1.240 9
0.45
3.296 96
?2.782 0
2.063 1
Tab.3Wave velocity calculation results obtained by peak value method
Fig.4Typical waveform at a point on incident bar
Fig.5Zhu-Wang-Tang constitutive physical model
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