Damage Quantification in Concrete under Fatigue Loading Using Acoustic Emission

Shan, Zhi; Yu, Zhiwu; Xiao, Li; Xie, Ying

doi:10.1155/2019/1359853

Cited by 8 publications

(5 citation statements)

References 56 publications

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“…Additionally, the hydration constitutive law was constructed. Shan et al [23] developed an AE quantification method of fatigue damaging in concrete. Particularly, the AE and a fibre bundle-based statistical damage model (fibre-bundled irreversible chain model) were combined.…”

Section: Introductionmentioning

confidence: 99%

State Judgement Model of the Coal and Rock Medium and Its Engineering Application

Zhu

Wang

Han

2020

Advances in Civil Engineering

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In the loading and failure process of the coal and rock medium, with the increasing of the damaging and failure extent, the medium state gradually changed from the continuous, the quasicontinuous, and the discontinuous to the loose successively. To evaluate the damaging failure extent of the coal and rock mass and distinguish the state of the coal and rock mass medium, first, the medium state index was defined based on the acoustic wave propagation model. Then, based on the coal mass in the working face 8512 in the Chenjiagou Coal Mine in China, the acoustic character and the mechanical character experiments were conducted. Through experiments, the variation law of the ultrasonic wave velocity and the medium state index of the coal mass with the strain under the compressive state were acquired; with the increasing of the strain, the medium state indexes successively experienced the variation process including stabilising around 0, slow increasing, dramatic increasing, and stabilising around 1. Then, based on the variation law of the medium state index, the coal and rock mass medium state judgement model was constructed. This model was applied to judge the coal mass medium state. After it, the mudstones in the roof of the same working face were regarded as the research object, the mudstone medium state was divided into 4 types according to the medium state judgement model, namely, continuous, quasicontinuous, discontinuous, and bulk solid, and the mudstone failure state was basically consistent with the continuous, quasicontinuous, discontinuous, and bulk solid state. The adaptability and rationality of the judgement model was verified. Finally, engineering application of the judgement model was conducted. The distribution law of the top coal with different medium state was acquired. In the top coal that was 186 m away from the working face, it belonged to the continuous medium state. As for the top coal that was 6 m to 186 m far away from the working face, it was under the quasicontinuous medium state. For the top coal that was 3 m to 6 m far away from the working face, it was under the discontinuous medium state. For the top coal that was less than 3 m far away from the working face and behind the working face, it belonged to the bulk solid medium state. The state judgement model can successfully distinguish the medium state of the coal seam and mudstones in the roof in the working face 8512. This provided a new approach to evaluate the damaging failure extent of the coal and rock medium in the Chenjiagou Coal Mine.

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Section: Introductionmentioning

confidence: 99%

State Judgement Model of the Coal and Rock Medium and Its Engineering Application

Zhu

Wang

Han

2020

Advances in Civil Engineering

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“…Investigações em nível microscópico realizadas nos últimos anos mostraram que a fissuração por fadiga tem início com microfissuras invisíveis em bandas deslizantes da microestrutura cristalina dos materiais (O'BRIEN;TAYLOR;LEE, 2003;BALBI et al, 2009;BIAN et al, 2011;SHAN et al, 2019;PILKEY;PILKEY;BI, 2020). Estas observações permitiram inferir que a nucleação ocorre de forma precoce, cerca de 3-8% de N f (BIAN et al, 2011;SHAN et al, 2019;PILKEY;PILKEY;BI, 2020). Ademais, os resultados possibilitaram indicar que a nucleação pode ocorrer quase imediatamente após a aplicação das cargas, se for aplicada um nível de tensão cíclica acima do limite de resistência à fadiga do material.…”

Section: Considerações Iniciaisunclassified

“…De acordo com os resultados obtidos neste trabalho e em investigações experimentais, disponíveis na literatura ao longo dos últimos 20 anos (O'BRIEN;TAYLOR;LEE, 2003;BALBI et al, 2009;BIAN et al, 2011;SHAN et al, 2019;PILKEY;PILKEY;BI, 2020), observou-se a existência de uma relação entre a vida útil à fadiga do concreto e a proporção da vida útil em que o material se encontra na fase de propagação das fissuras, que configura o estágio II da curva de fluência cíclica.…”

Section: Histórico De Deformaçõesunclassified

“…O'Brien, Taylor e Lee (2003) e Balbi et al (2009) relatam que o desenvolvimento de microfissuras em concretos submetidos à compressão cíclica ocorre de forma precoce, iniciandose logo após a realização de um baixo número de ciclos de carregamento, período compreendido entre 3 e 8% da vida útil à fadiga. Para Bian et al (2011), Shan et al (2019 e Pilkey, Pilkey e Bi (2020) a nucleação no concreto ocorre quase que imediatamente à aplicação do carregamento cíclico, pois o concreto já possui micro defeitos em sua estrutura cristalina, o que faz com que o surgimento das fissuras ocorra sob baixos níveis de tensão.…”

Section: Histórico De Deformaçõesunclassified

“…da vida útil à fadiga. ParaBian et al (2011), Shan et al (2019 e Pilkey, Pilkey e Bi (2020) a nucleação no concreto ocorre quase que imediatamente à aplicação do carregamento cíclico pois o concreto já possui micro defeitos em sua estrutura cristalina, o que faz com que a propagação das fissuras ocorra sob baixos níveis de tensão.…”

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Estudo numérico-experimental da fadiga em concretos submetidos a compressão cíclica: proposição de um modelo de dano acumulado

Félix¹

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Inicialmente agradeço à Deus, que me guia, me protege, me da força e sabedoria para vencer todos os desafios desta vida.À minha mãe, Eliane, e minha avó, Lourdes, por todo amor e por sempre fazerem de tudo para que eu pudesse realizar meus sonhos.Ao meu orientador, professor Dr. Rogério Carrazedo, por ter acreditado em meu potencial desde o momento em que tivemos nossa primeira reunião, ainda no mestrado. Agradeço por ter aceitado desbravar comigo os desafios que este trabalho nos trouxe. Agradeço pela sua dedicação, atenção, amizade, experiência e contínua presença em todas as etapas de desenvolvimento deste trabalho.Agradeço à minha coorientadora, professora Dra. Edna Possan, por ter me iniciado nos caminhos da investigação científica, e por ter me incentivado a sempre ir atrás dos meus sonhos. Agradeço pela sua dedicação, amizade e comprometimento.Agradeço à professora Dra. Gláucia Dalfré por sempre ter me incentivado, pelo seu constante suporte, amizade e por ter me encorajado a vir desenvolver a pós no Departamento de Estruturas, da Escola de Engenharia de São Carlos-EESC/USP. Aos professores Dr. Rodrigo Paccola e Dr. Humberto Breves Coda pelo auxílio no desenvolvimento dos códigos desenvolvidos neste trabalho e por sempre estarem dispostos a transmitir conhecimento. Agradeço também às contribuições fornecidas pelos membros da banca de defesa, os professores:

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Flexural fatigue performance and damage evolution analysis of multiscale polypropylene fiber‐reinforced concrete

Liang,

You,

Zhou

et al. 2024

Structural Concrete

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As an excellent concrete reinforcement material, polypropylene fiber has a high potential for bulk‐scale applications. In this study, a comprehensive experimental campaign was carried out to assess the flexural fatigue performance of multiscale polypropylene fiber‐reinforced concrete (MPFRC). Two types of fine polypropylene fiber (FPF) and one type of coarse polypropylene fiber (CPF) were selected for single doping or hybridization into concrete. The fatigue deformation damage mechanism of polypropylene fiber reinforced concrete (PFRC) was analyzed through acoustic emission (AE) and scanning electron microscopy. Results indicated that the incorporation of polypropylene fibers could significantly improve the strength of concrete, with the best results for MPFRC, where the compressive, tensile, and flexural strength were increased by 13.12%, 20.59%, and 25.49%, respectively, compared to the plain concrete. The fatigue life of PFRC obeyed the Weibull distribution at different stress levels, with the mean fatigue life of MPFRC increasing by up to 6.37 times. The fatigue strain‐to‐cycle ratio curves coincided with the cumulative AE ringing count‐to‐cycle ratio curves, both showed that the fatigue damage process of MPFRC underwent three distinct stages, accounting for 5%, 85%, and 10% of the total fatigue life, respectively. By forming a three‐dimensional mesh structure inside the concrete, polypropylene fibers effectively mitigated internal damage and improved the fatigue performance of the concrete.

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Damage Quantification in Concrete under Fatigue Loading Using Acoustic Emission

Cited by 8 publications

References 56 publications

State Judgement Model of the Coal and Rock Medium and Its Engineering Application

State Judgement Model of the Coal and Rock Medium and Its Engineering Application

Estudo numérico-experimental da fadiga em concretos submetidos a compressão cíclica: proposição de um modelo de dano acumulado

Flexural fatigue performance and damage evolution analysis of multiscale polypropylene fiber‐reinforced concrete

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