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Research on dynamic splitting damage characteristics and constitutive model of basalt fiber reinforced concrete based on acoustic emission
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Highlights AE was used to study the dynamic splitting damage characteristics of BFRC. The effects of loading rate and fiber content on BFRC were studied. Moderate dosage fibers can improve the dynamic splitting tensile strength of BFRC. The dynamic splitting AE characteristics of BFRC were greatly affected by loading rate. A dynamic splitting constitutive model was derived for BFRC.
Abstract In order to effectively utilize fiber reinforced concrete in engineering, it is necessary to investigate its mechanical properties and damage characteristics under dynamic tensile loads. This paper studied the effects of loading rate and fiber content on the tensile strength and acoustic emission (AE) characteristics of basalt fiber reinforced concrete (BFRC) in dynamic splitting tests. Brazilian disc splitting tests were carried out on the BFRC specimens with various fiber volume fraction (0%, 0.05%, 0.1%, 0.15%, 0.2%). Then the dynamic splitting AE characteristics were analyzed by means of parameter analysis method. Additionally, the stress–strain curves of BFRC were fitted by the constitutive model modified based on AE rate-process theory. The test results indicate that the tensile strength is enhanced with the increasing loading rate while adding basalt fibers has the same effect. Preferable fiber contents are 0.1% and 0.15%. Then it is found that loading rate and fiber content exert considerable impacts on the AE characteristics. Furthermore, the good fitting results suggest that the mechanics behavior of BFRC under dynamic splitting loads can be well described by the modified constitutive model.
Research on dynamic splitting damage characteristics and constitutive model of basalt fiber reinforced concrete based on acoustic emission
Graphical abstract Display Omitted
Highlights AE was used to study the dynamic splitting damage characteristics of BFRC. The effects of loading rate and fiber content on BFRC were studied. Moderate dosage fibers can improve the dynamic splitting tensile strength of BFRC. The dynamic splitting AE characteristics of BFRC were greatly affected by loading rate. A dynamic splitting constitutive model was derived for BFRC.
Abstract In order to effectively utilize fiber reinforced concrete in engineering, it is necessary to investigate its mechanical properties and damage characteristics under dynamic tensile loads. This paper studied the effects of loading rate and fiber content on the tensile strength and acoustic emission (AE) characteristics of basalt fiber reinforced concrete (BFRC) in dynamic splitting tests. Brazilian disc splitting tests were carried out on the BFRC specimens with various fiber volume fraction (0%, 0.05%, 0.1%, 0.15%, 0.2%). Then the dynamic splitting AE characteristics were analyzed by means of parameter analysis method. Additionally, the stress–strain curves of BFRC were fitted by the constitutive model modified based on AE rate-process theory. The test results indicate that the tensile strength is enhanced with the increasing loading rate while adding basalt fibers has the same effect. Preferable fiber contents are 0.1% and 0.15%. Then it is found that loading rate and fiber content exert considerable impacts on the AE characteristics. Furthermore, the good fitting results suggest that the mechanics behavior of BFRC under dynamic splitting loads can be well described by the modified constitutive model.
Research on dynamic splitting damage characteristics and constitutive model of basalt fiber reinforced concrete based on acoustic emission
Zhang, Hua (author) / Jin, Chuanjun (author) / Wang, Lei (author) / Pan, Luoyu (author) / Liu, Xinyue (author) / Ji, Shanshan (author)
2021-12-04
Article (Journal)
Electronic Resource
English
AE , acoustic emission , BFRC , basalt fiber reinforced concrete , <italic>f<inf>t</inf></italic> , dynamic splitting tensile strength , <italic>P<inf>max</inf></italic> , peak load , <italic>D<inf>s</inf></italic> , diameter of the Brazilian disc specimen , <italic>H</italic> , height of the Brazilian disc specimen , RA , rising angle , AF , average frequency , <italic>T<inf>1</inf></italic> , rising time , <italic>A</italic> , amplitude , <italic>n</italic> , ring count , <italic>T<inf>2</inf></italic> , duration , <italic>l<inf>x</inf></italic> , transverse displacement , <italic>l<inf>y</inf></italic> , vertical displacement , <italic>μ</italic> , Poisson ratio , <italic>D</italic> , damage factor , <italic>ε<inf>pk</inf></italic> , peak strain , <italic>A<inf>t</inf> & B<inf>t</inf></italic> , material constants , <italic>N</italic> , cumulative number of AE events , <italic>N<inf>0</inf></italic> , cumulative number of AE events corresponding to the peak stress , <italic>k</italic> , reciprocal of <italic>N<inf>0</inf></italic> , <italic>a</italic> , acoustic emission rate parameter , <italic>b</italic> , acoustic emission process parameter , <italic>c</italic> , integral constant related to test conditions , Acoustic emission technology , Brazilian disc splitting test , Basalt fiber reinforced concrete , Dynamic splitting acoustic emission characteristics , Dynamic splitting constitutive model , Dynamic splitting tensile strength
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