Characterization of fatigue crack growth of concrete mortar under cyclic indentation loading

Toyama, Hidehiko; Kishida, Hiroshi; Yonezu, Akio

doi:10.1016/j.engfailanal.2017.10.004

Cited by 22 publications

(6 citation statements)

References 24 publications

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“…Deixa-se evidente a necessidade do ensaio de determinação do módulo de resistência à flexão, descrito em detalhes no anexo C da NBR 13818, devido ao esforço de flexão a que as peças cerâmicas estão submetidas, devido ao aumento das tensões na região das juntas e diminuição no centro das peças cerâmicas. Para as tensões de cisalhamento, houve aumento nos valores entre a argamassa colante/peças cerâmicas e rejunte e entre argamassa colante/emboço, sendo este aumento mais significativo para o sistema composto por argamassa colante tipo B. Para Toyama et al (2017), estabeleceu um modelo computacional de uma fratura de contato em argamassa de concreto submetida a ensaios de indentação monotônica e cíclica com indentador esférico, com o intuito de imitar as fraturas de contato locais. Diante disso, foi possível comprovar danos de microescala nas fraturas de contato e pelo teste de indentação monotônica, comprovou que a fissura se propaga com o aumento do número de ciclos, considerando a mesma carga aplicada.…”

Section: Desenvolvimentounclassified

Estado da arte do estudo de fratura por fadiga em argamassas

Nobre¹,

Silva²,

Pereira³

et al. 2021

Congresso Internacional Sobre Patologia E Reabilitação Das Construções

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Na atualidade o estudo sobre o comportamento mecânico de estruturas de materiais cimentícios vem se tornando cada vez mais importante, pois observa que diversas manifestações patológicas são geradas por um déficit mecânico do material, sendo este, submetido a esforços no qual não foi dimensionado por falta de conhecimento do comportamento mecânico em resposta a um determinado estímulo. O caso das argamassas de revestimento que podem sofrer ruptura por fadiga, devido aos esforços térmicos que são submetidos ciclicamente, ou seja, a fadiga das argamassas podem ser um dos principais motivos para gerar diversas manifestações patológicas, principalmente nas de revestimento que ficam expostas a condições climáticas adversas, como variação de umidade e temperatura que podem gerar tensões de alta magnitude levando a fratura do material. Com base nisto o presente trabalho tem como objetivo descrever o estado da arte do comportamento da fratura por fadiga em argamassas, onde se fez um estudo detalhado sobre diversos trabalhos que estudaram esse mecanismo em compostos cimentícios, principalmente os que foram submetidos a diversos ciclos de carga e descarga relacionando os fatores que influenciaram nos resultados obtidos pelos autores, evidenciando que o material poderá alcançar a ruptura mesmo em tensões abaixo da tensão resistente do material.

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Section: Desenvolvimentounclassified

Estado da arte do estudo de fratura por fadiga em argamassas

Nobre¹,

Silva²,

Pereira³

et al. 2021

Congresso Internacional Sobre Patologia E Reabilitação Das Construções

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“…The thickness of the cohesive element is set to zero, which is appropriate to represent crack. Based on the cohesion zone model (CZM), many scholars have studied concrete 11 , 25 – 27 and rock 28 , 29 at mesoscale, and analyzed the fracture process of rock-like materials.…”

Section: Introductionmentioning

confidence: 99%

Distribution of cracks in an anchored cavern under blast load based on cohesive elements

Luo

Pei

et al. 2022

Sci Rep

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To explore the distribution of cracks in anchored caverns under the blast load, cohesive elements with zero thickness were employed to simulate crack propagation through numerical analysis based on a similar model test. Furthermore, the crack propagation process in anchored caverns under top explosion was analyzed. The crack propagation modes and distributions in anchored caverns with different dip angles fractures in the vault were thoroughly discussed. With the propagation of the explosive stress waves, cracks successively occur at the arch foot, the floor of the anchored caverns, and the boundary of the anchored zone of the vault. Tensile cracks are preliminarily found in rocks that surround the caverns. In the scenario of a pre-fabricated fracture in the upper part of the vault, the number of cracks at the boundary of the anchored zone of the vault first decreases then increases with the increasing dip angle of the pre-fabricated fracture. When the dip angle of the pre-fabricated fracture is 45°, the fewest cracks occur at the boundary of the anchored zone. The wing cracks deflected to the vault are formed at the tip of the pre-fabricated fracture, around which are synchronous formed tensile and shear cracks. Under top explosion, the peak displacement and the peak particle velocity in surrounding rocks of anchored caverns both reach their maximum values at the vault, successively followed by the sidewall and the floor. In addition, with the different dip angles of the pre-fabricated fracture, asymmetry could be found between the peak displacement and the peak particle velocity. The vault displacement of anchored caverns is mainly attributed to tensile cracks at the boundary of the anchored zone, which are generated due to the tensile waves reflected from the free face of the vault. When a fracture occurs in the vault, the peak displacement of the vault gradually decreases while the residual displacement increases.

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“…Cohesive element has the advantages of high computational efficiency and good convergence in analyzing crack propagation [24,25] . Based on cohesion model, many scholars have studied concrete [26,27,28,29] and rock [30,31] at meso scale, and analyzed the fracture process of rock like materials. The existing research on the dynamic response of anchored caverns mainly focuses on stress, displacement and vibration velocity, and there is little research on the crack propagation of anchored caverns.…”

Section: Introductionmentioning

confidence: 99%

Distribution of Cracks in an Anchored Cavern Under Blast Load Based on Cohesive Elements

Luo

Pei

et al. 2021

Preprint

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To explore the distribution of cracks in anchored caverns under the blast load, cohesive elements with zero thickness were employed to simulate crack propagation through numerical analysis based on a similar model test. Furthermore, the crack propagation process in anchored caverns under top explosion was analysed and the distribution and mode of propagation of cracks in anchored caverns when a fracture with different dip angles was present in the vault were discussed. With the propagation of the explosive stress waves, cracks successively occur at the boundary of the anchored zone of the vault, arch foot, and floor of the anchored caverns. Tensile cracks are preliminarily found in rocks surrounding the caverns. In the case that a pre-fabricated fracture is present in the upper part of the vault, the number of cracks at the boundary of the anchored zone of the vault decreases, then increases with increasing dip angle of the pre-fabricated fracture. The fewest cracks at the boundary of the anchored zone occur if the dip angle of the pre-fabricated fracture is 45º. The wing cracks deflected to the vault are formed at the tip of the pre-fabricated fracture, around which tensile and shear cracks are synchronously present. Under top explosion, both the peak displacement and peak particle velocity in surrounding rocks of anchored caverns reach their maximum values at the vault, successively followed by the side wall and the floor. In addition, they show asymmetry with the difference of the dip angle of the pre-fabricated fracture; the vault displacement of anchored caverns is mainly attributed to the formation of tensile cracks at the boundary of the anchored zone generated due to tensile waves reflected from the free face of the vault. When a fracture is present in the vault, the peak displacement of the vault decreases while the residual displacement increases.

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Characterization of fatigue crack growth of concrete mortar under cyclic indentation loading

Cited by 22 publications

References 24 publications

Estado da arte do estudo de fratura por fadiga em argamassas

Estado da arte do estudo de fratura por fadiga em argamassas

Distribution of cracks in an anchored cavern under blast load based on cohesive elements

Distribution of Cracks in an Anchored Cavern Under Blast Load Based on Cohesive Elements

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