Axial tensile tests for dynamic fracture characteristics of concrete-granite interface

ZHONG Hong1,2, MA Zhenzhou2,3, HU Shaowei4,5, FAN Xiangqian4,5

Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (11) : 152-158.

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PDF(2142 KB)
Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (11) : 152-158.

Axial tensile tests for dynamic fracture characteristics of concrete-granite interface

  • ZHONG Hong1,2,   MA Zhenzhou2,3,  HU Shaowei4,5,   FAN Xiangqian4,5
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Abstract

In order to study the loading strain rate effect of interfacial fracture of concrete-granite, axial tensile tests were performed on granite specimens, concrete ones and concrete-granite composite ones with bilateral precast cracks using a MTS testing machine under different loading rates. Through controlling crack opening displacement, load-crack opening displacement curves under strain rates of 10-6—10-3s-1 were obtained, and then the energy absorption capacity during loading rising was calculated. Based on theories of structural dynamic analysis, fracture mechanics and interfacial mechanics, the specimens’ fracture toughness were calculated. The results showed that with the variation of strain rate, fracture surface morphologies of the three kinds of specimens exhibit different features; their peak load, energy absorption capacity and fracture toughness increase with increase in strain rate. The rate effect mechanisms of the three kinds of specimens’ fracture characteristics were analyzed, respectively within the range of middle-low strain rates; quasi-brittle materials’ interfacial fracture and base material’s fracture rate effect are compared.

Key words

axial tension test / interfacial fracture / peak load / energy absorption capacity / fracture toughness

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ZHONG Hong1,2, MA Zhenzhou2,3, HU Shaowei4,5, FAN Xiangqian4,5. Axial tensile tests for dynamic fracture characteristics of concrete-granite interface[J]. Journal of Vibration and Shock, 2019, 38(11): 152-158

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