Experimental Study on the Tensile Properties of Rock-Mortar Interface under Different Strain Rates

In this paper, an experimental study was carried out on a rock-mortar interface specimen under three different strain rates (10−6, 10−5, and 10−4  s−1) using the MTS322 electrohydraulic servo loading system, and a new constitutive relation function of fictitious crack model (FCM) according to the ax...

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Main Authors: Nan Wu, Zhende Zhu, Zhilei He
Format: Article
Language:English
Published: Hindawi Limited 2018-01-01
Series:Advances in Materials Science and Engineering
Online Access:http://dx.doi.org/10.1155/2018/5241848
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spelling doaj-c50519d707934e3db3bdfa165f9a47ca2020-11-25T01:03:46ZengHindawi LimitedAdvances in Materials Science and Engineering1687-84341687-84422018-01-01201810.1155/2018/52418485241848Experimental Study on the Tensile Properties of Rock-Mortar Interface under Different Strain RatesNan Wu0Zhende Zhu1Zhilei He2Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210098, ChinaKey Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210098, ChinaKey Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210098, ChinaIn this paper, an experimental study was carried out on a rock-mortar interface specimen under three different strain rates (10−6, 10−5, and 10−4  s−1) using the MTS322 electrohydraulic servo loading system, and a new constitutive relation function of fictitious crack model (FCM) according to the axial-stress-crack-width curves of the rock-mortar interface is established, because the traditional nonlinear softening function easily distorts, shakes, and so cannot describe the damage-evolution process of the rock-mortar interface accurately. Through the use of a precise servo actuator system and three extensometers measured axial-stress-crack-width curves, it is shown that the rock-mortar interface is very sensitive to the strain rate. The tensile strength increases with strain rate, the crack width decreases at the same time, and the axial-stress-crack-width curves gradually evolve from a concave-downward trend to a linear decreasing trend. At the same time, the new constitutive relation function can reflect the tensile strength, crack width, and the downward trend of the rock-mortar interface more accurately.http://dx.doi.org/10.1155/2018/5241848
collection DOAJ
language English
format Article
sources DOAJ
author Nan Wu
Zhende Zhu
Zhilei He
spellingShingle Nan Wu
Zhende Zhu
Zhilei He
Experimental Study on the Tensile Properties of Rock-Mortar Interface under Different Strain Rates
Advances in Materials Science and Engineering
author_facet Nan Wu
Zhende Zhu
Zhilei He
author_sort Nan Wu
title Experimental Study on the Tensile Properties of Rock-Mortar Interface under Different Strain Rates
title_short Experimental Study on the Tensile Properties of Rock-Mortar Interface under Different Strain Rates
title_full Experimental Study on the Tensile Properties of Rock-Mortar Interface under Different Strain Rates
title_fullStr Experimental Study on the Tensile Properties of Rock-Mortar Interface under Different Strain Rates
title_full_unstemmed Experimental Study on the Tensile Properties of Rock-Mortar Interface under Different Strain Rates
title_sort experimental study on the tensile properties of rock-mortar interface under different strain rates
publisher Hindawi Limited
series Advances in Materials Science and Engineering
issn 1687-8434
1687-8442
publishDate 2018-01-01
description In this paper, an experimental study was carried out on a rock-mortar interface specimen under three different strain rates (10−6, 10−5, and 10−4  s−1) using the MTS322 electrohydraulic servo loading system, and a new constitutive relation function of fictitious crack model (FCM) according to the axial-stress-crack-width curves of the rock-mortar interface is established, because the traditional nonlinear softening function easily distorts, shakes, and so cannot describe the damage-evolution process of the rock-mortar interface accurately. Through the use of a precise servo actuator system and three extensometers measured axial-stress-crack-width curves, it is shown that the rock-mortar interface is very sensitive to the strain rate. The tensile strength increases with strain rate, the crack width decreases at the same time, and the axial-stress-crack-width curves gradually evolve from a concave-downward trend to a linear decreasing trend. At the same time, the new constitutive relation function can reflect the tensile strength, crack width, and the downward trend of the rock-mortar interface more accurately.
url http://dx.doi.org/10.1155/2018/5241848
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AT zhendezhu experimentalstudyonthetensilepropertiesofrockmortarinterfaceunderdifferentstrainrates
AT zhileihe experimentalstudyonthetensilepropertiesofrockmortarinterfaceunderdifferentstrainrates
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