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      Strain rate effect on the acoustic emission characteristics of concrete under uniaxial tension

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          Abstract

          Concrete is an important engineering material whose tensile property plays an important role in structural safety. Thus, the effect of strain rate on crack evolution in concrete during tension cracking cannot be neglected. Within a strain rate range of 10 −6 to 10 −4 s −1, an acoustic emission monitoring test for the whole process of concrete under uniaxial tension including the post-peak softening stage was conducted. Moreover, damage evolution, along with the cracking mechanism of concrete at various strain rates was discussed with respect to the effect of strain rate on acoustic emission. The results show that the acoustic emission activity of concrete is delayed due to an increase in strain rate. This indicates that the hysteresis of deformation and cracking can be observed in a uniaxial tension test of concrete. During the whole loading process, as the strain rate increased, the average level of the acoustic emission hit rate increased significantly, indicating that an increase in strain rate accelerates crack initiation and propagation in concrete. Average acoustic emission values, duration and energy also show an increasing trend, and the scatter distribution range between them and the acoustic emission amplitude changes significantly, a fact that can be used to identify the damage degree of concrete under different strain rates. A peak frequency and cd4 band wavelet energy spectrum coefficient tends to decrease, while the ca8 band wavelet energy spectrum coefficient increases. In other words, the proportion of low frequency acoustic emission signals increases, indicating that an increase in strain rate increases the proportion of macroscopic cracks in concrete. At various strain rates, the average level of acoustic emission characteristic parameters and the proportion of high frequency signals at the post-peak stage in concrete are higher than those at the pre-peak stage, indicating that the development of microcracks in concrete mainly concentrates during the post-peak softening stage.

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          On acoustic emission for failure investigation in CFRP: Pattern recognition and peak frequency analyses

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            Damage classification in reinforced concrete beam by acoustic emission signal analysis

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              Experimental study on dynamic split tensile properties of rubber concrete

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                Author and article information

                Journal
                mp
                Materials Testing
                Carl Hanser Verlag
                0025-5300
                2195-8572
                7 January 2020
                : 62
                : 1
                : 5-11
                Affiliations
                1 Nanjing, P. R. China
                Author notes
                [] Correspondence Address, Associate Prof. Dr. Yan Wang, College of Civil and Transportation Engineering, Hohai University, Nanjing, 210024, China, E-mail: drwanghhu@ 123456126.com

                Associate Prof. Dr. Wang Yan, born in 1980, studied Civil Engineering at Hohai University, China, from 2000 till 2009. There, he finished his PhD on the damage assessment and damage mechanism of concrete based on acoustic emission technology in 2009 and and began teaching at the university in the same year. The focus of his research lies on the damage study of concrete based on acoustic emission and ultrasonic technique.

                MEng Wang Na, born in 1995, has been studying Civil Engineering at Hohai University, China, since 2017. Her research focuses on the damage process of concrete and reinforced concrete based on acoustic emission analysis technique and method.

                MEng Yan Chao, born in 1994, has been studying Civil Engineering at Hohai University, China, since 2017. Her research focuses on the damage process of concrete based on acoustic emission wavelet analysis technique.

                MEng Zhang Ting Ting, born in 1993, has been studying Civil Engineering at Hohai University, China, since 2016. Her research focuses on the whole damage process of concrete based on acoustic emission fractal theory.

                MEng Chen Li Jun, born in 1996, has been studying Civil Engineering at Hohai University, China, since 2018. Her research focuses on the damage characteristics of reinforced concrete based on the acoustic emission analysis technique.

                MEng Gu Jie, born in 1995, has been studying Civil Engineering at Hohai University, China, since 2018. Her research focuses on the damage characteristics of concrete based on acoustic emission and neural networks.

                Article
                MP111445
                10.3139/120.111445
                656c88e4-85aa-4c87-9310-c5a1bb7442ba
                © 2020, Carl Hanser Verlag, München
                History
                Page count
                References: 31, Pages: 7
                Categories
                Fachbeiträge/Technical Contributions

                Materials technology,Materials characterization,Materials science
                Materials technology, Materials characterization, Materials science

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