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Damage Processes of Polypropylene Fiber Reinforced Mortar in Different Fiber Content Revealed by Acoustic Emission Behavior 被引量:3
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作者 王岩 CHEN Shijie +2 位作者 XU Zhengzheng LIU Shaojun HU Hongxiang 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2018年第1期155-163,共9页
The performances of the cement-based materials can be improved by the incorporation of polypropylene fiber, but the damage processes become more complex with different fiber contents at the same time. The acoustic emi... The performances of the cement-based materials can be improved by the incorporation of polypropylene fiber, but the damage processes become more complex with different fiber contents at the same time. The acoustic emission(AE) technology can achieve the global monitoring of internal damage in materials. The evolution process of failure mode and damage degree of polypropylene fiber reinforced mortar and concrete were analyzed by measuring the AE energy, RA value, AF value and b value. It was found that the cement matrix cracked on the initial stage, the cracks further developed on the medium stage and the fibers were pulled out on the last stage. The matrix cracked with minor injury cracks, but the fiber broke with serious damage cracks. The cumulative AE energy was proportional to the polypropylene fiber reinforced concrete and mortar's ductility. The damage mode and damage degree can be judged by identifying the damage stage obtained by the analysis of the AF value. 展开更多
关键词 polypropylene fiber different content MORTAR concrete acoustic emission damage processes
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Damage process and performance of PVA fiber-reinforced alkali-activated slag mortar plate under bending 被引量:3
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作者 Dong Chenghao Li Tao +1 位作者 Zhang Yamei Liu Jiaping 《Journal of Southeast University(English Edition)》 EI CAS 2018年第2期229-236,共8页
The effects of unoiled polyvinyl alcohol(PVA)fiber with four different volume fractions of 0%,1.0%,1.5%and 2.0%on the bending properties of alkali-activated slag(AAS)mortar plates were studied.Meanwhile,the acoustic e... The effects of unoiled polyvinyl alcohol(PVA)fiber with four different volume fractions of 0%,1.0%,1.5%and 2.0%on the bending properties of alkali-activated slag(AAS)mortar plates were studied.Meanwhile,the acoustic emission(AE)technique and a high-speed camera were utilized to detect the crack development over the complete damage process,and the scanning electronic microscopy(SEM)was used to observe the fiber-matrix interface.Test results show that PVA fibers play a significant role in the toughness improvement of AAS plates.However,the enhancing effect of PVA fibers on the bending behaviour of AAS plates at 120 d is not as remarkable as at early ages.It is observed that the failure process of the PVA fiber-reinforced alkali-activated slag plate can be divided into three stages:elastic stage,main crack formation stage and post-peak load stage.Observations on the fracture surface of specimens indicate that the deterioration process of specimens under bending changed from fiber pull-out at 3 and 28 d to fiber fracture at 120 d. 展开更多
关键词 alkali-activated slag polyvinyl alcohol fiber BEND acoustic emission damage process
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BRITTLE-DAMAGE ANALYSIS OF CRACKS UNDER CONDITIONS OF PLANE-STRAIN TENSILE LOADING
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作者 Guo Tianfu, Department of Flight Vehicle Design and Applied Mechanics, Beijing University of Aeronautics and Astronautics, Beijing, 100083Yang Wei, Department of Engineering Mechanics, Tsinghua University, Beijing, 100084 《Acta Mechanica Solida Sinica》 SCIE EI 1995年第1期15-23,共9页
An abrupt damage model, taking full account of finite geometry changes, is used to study both the shapes of damage zones and the stress strain fields for a plane-strain tensile crack under the small-scale yielding con... An abrupt damage model, taking full account of finite geometry changes, is used to study both the shapes of damage zones and the stress strain fields for a plane-strain tensile crack under the small-scale yielding condition. Two typical crack-tip damage profiles are simulated by the element vanish technique. The fracture toughness increment due to damage dissipation is evaluated in terms of the energy release rate. 展开更多
关键词 brittle damage damage process zone element vanish technique fracture toughness increment
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Heterogeneity induced strain localization in block-in-matrix-soils subjected to uniaxial loading using real-time CT scanning
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作者 Yanfang Wu Xiao Li +5 位作者 Luqing Zhang Shengwen Qi Jian Zhou Jianming He Zhaobin Zhang Xiukuo Sun 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2023年第8期1951-1959,共9页
Block-in-matrix-soils(bimsoils)are geological mixtures that have distinct structures consisting of relatively strong rock blocks and weak matrix soils.It is still a challenge to evaluate the mechanical behaviors of bi... Block-in-matrix-soils(bimsoils)are geological mixtures that have distinct structures consisting of relatively strong rock blocks and weak matrix soils.It is still a challenge to evaluate the mechanical behaviors of bimsoils because of the heterogeneity,chaotic structure,and lithological variability.As a result,only very limited laboratory studies have been reported on the evolution of their internal deformation.In this study,the deformation evolution of bimsoils under uniaxial loading is investigated using real-time X-ray computed tomography(CT)and image correlation algorithm(with a rock block percentage(RBP)of 40%).Three parameters,i.e.heterogeneity coefficient(K),correlation coefficient(CC),and standard deviation(STD)of displacement fields,are proposed to quantify the heterogeneity of the motion of the rock blocks and the progressive deformation of the bimsoils.Experimental results show that the rock blocks in bimsoils are prone to forming clusters with increasing loading,and the sliding surface goes around only one side of a cluster.Based on the movement of the rock blocks recorded by STD and CC,the progressive deformation of the bimsoils is quantitatively divided into three stages:initialization of the rotation of rock blocks,formation of rock block clusters,and formation of a shear band by rock blocks with significant rotation.Moreover,the experimental results demonstrate that the meso-motion of rock blocks controls the macroscopic mechanical properties of the samples. 展开更多
关键词 Image correlation algorithm damage processing Real-time computed tomography(CT) imaging Rock block motion Uniaxial compression
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Effect of Interfacial Strength on the Flexural Behavior of Glass Fiber Reinforced Polymer(GFRP) Reinforced Concrete Beam 被引量:1
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作者 张亚芳 YANG Wenlong +2 位作者 LIU Hao CHEN Peiran LIU Feng 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2015年第5期1001-1007,共7页
The reinforcement/matrix interfacial strength has been considered as the key factor when glass fiber reinforced polymer(GFRP) bar is mixed with concrete. In this paper, based on micromechanics, fourpoint bending numer... The reinforcement/matrix interfacial strength has been considered as the key factor when glass fiber reinforced polymer(GFRP) bar is mixed with concrete. In this paper, based on micromechanics, fourpoint bending numerical models with and without glass fiber of different interfacial strength have been set up to simulate the damage process of GFRP reinforced concrete beam. The results show that the higher the interfacial strength is, the higher the ultimate bearing capacity of beams, and the less the opening width and height of cracks will be reached. Furthermore, mixing of glass fibers has less influence on the damage process when the interfacial strength is weak, however, it can help to improve the ultimate bearing capacity of the beams, retard the expansion of cracks and improve the toughness when the interfacial strength is high. 展开更多
关键词 interfacial strength GFRP damage process DEBONDING numerical simulation
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Study on Preventive Software Rejuvenation Policy for Two Kinds of Bugs
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作者 Xufeng Zhao Cunhua Qian Nakagawa Toshio 《Journal of Systems Science and Information》 2009年第2期103-110,共8页
A new preventive software rejuvenation policy is proposed in this paper. This technique is implemented when additive consumption of physical memory has reached some level. Using the theory of cumulative damage process... A new preventive software rejuvenation policy is proposed in this paper. This technique is implemented when additive consumption of physical memory has reached some level. Using the theory of cumulative damage process, two models are given for two kinds of bugs. For the first model, aging-related bug is considered only and consumption of physical memory could be known by tests made at periodic times, optimal preventive rejuvenation policy is analytically derived and numerical example is given. As an extended preventive software rejuvenation policy, Heisenbug and aging-related bug are considered meanwhile in the second model. 展开更多
关键词 software rejuvenation physical memory BUG cumulative damage process system reliability
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