Numerical simulation of stress wave attenuation in brittle material and spalling experiment design

Wu Xutao; Liao Li

doi:10.11883/1001-1455(2017)04-0705-07

Volume 37 Issue 4

May 2017

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Wu Xutao, Liao Li. Numerical simulation of stress wave attenuation in brittle material and spalling experiment design[J]. Explosion And Shock Waves, 2017, 37(4): 705-711. doi: 10.11883/1001-1455(2017)04-0705-07

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Wu Xutao, Liao Li. Numerical simulation of stress wave attenuation in brittle material and spalling experiment design[J]. Explosion And Shock Waves, 2017, 37(4): 705-711. doi: 10.11883/1001-1455(2017)04-0705-07

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Numerical simulation of stress wave attenuation in brittle material and spalling experiment design

doi: 10.11883/1001-1455(2017)04-0705-07

Wu Xutao,
Liao Li

School of Civil and Hydraulic Engineering, Hefei University of Technology, Hefei 230009, Anhui, China

Received Date: 2015-12-23
Rev Recd Date: 2016-03-23
Publish Date: 2017-07-25

Abstract

Abstract

Using finite element simulation, we investigated the spalling of such brittle materials as concrete and rock, studied the attenuation mechanism governing the stress wave propagation through the specimen of brittle materials, and found two kinds of mechanisms: the small amplitude linear attenuation of the elastic wave due to the geometric dispersion of the large size specimen, and the exponential decay of the viscoplastic wave associated with the strain rate due to the constitutive relation. Based on this, we proposed a peak fitting formula of exponential type stress wave with a constant term. It is suggested that we should choose a slender specimen in the spalling test in which the attenuation of the stress wave can be ignored. In addition, we studied the spalling damage of concrete and rock. The scab thickness obtained from the finite element method agrees well with one-dimensional stress wave theory, verifying that the method for determining the spalling strength by one-dimensional stress wave theory is effective. By comparing the scab shape and the tensile stress wave of the brittle material loading by three kinds of the incident wave, we proved that it is more feasible to obtain a flatter spalling cross-section and more precise strength by using an asymmetric incident wave.
- brittle material,
- stress wave,
- attenuation law,
- spalling

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References

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