Modeling of Cohesive Fracture and Plasticity Processes in Composite Microstructures

Pituba, José Julio de Cerqueira; Fernandes, Gabriela Rezende; Neto, E. A. de Souza

doi:10.1061/(asce)em.1943-7889.0001123

Cited by 17 publications

(24 citation statements)

References 38 publications

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“…The cohesive contact finite element is defined as an element with four nodes and its geometry is compatible with the two triangule finite elements used to model the matrix and aggregate zones. The formulation of the cohesive contact finite element is presented in Pituba and Souza Neto [12] and Pituba et al [19]. On the other hand, to deal with plastic strains presented on the macrostructure of the concrete when the material is subjected mainly to compression stress, the well-know Mohr-Coulomb model is used to represent the mechanical behavior of the cement matrix.…”

Section: Figurementioning

confidence: 99%

Evaluation of a proposed model for concrete at mesoscopic scale

Borges

Quaresma

Fernandes

et al. 2017

Rev. IBRACON Estrut. Mater.

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ResumoThis work deals with numerical modeling of mechanical behavior in quasi-brittle materials, such as concrete. For this propose, a two-dimensional meso-scale model based on RVE existence is presented. The material is considered as a three-phase material consisting of interface zone (ITZ), matrix and inclusions -each constituent modeled by an independent constitutive model. The Representative Volume Element (RVE) consists of inclusions idealized as circular shapes symmetrically and non-symmetrically placed into the specimen. The interface zone is modeled by means of cohesive contact finite elements. The inclusion is modeled as linear elastic and matrix region is considered as elastoplastic material. Our main goal here is to show a computational homogenization-based approach as an alternative to complex macroscopic constitutive models for the mechanical behavior of the brittle materials using a finite element procedure within a purely kinematical multi-scale framework. Besides, the fundamental importance of the representing dissipative phenomena in the interface zone to model the complex microstructural responses of materials like concrete is focused in this work. A set of numerical examples, involving the microcracking processes, is provided in order to illustrate the performance of the proposed modeling.Keywords: homogenization, quasi-brittle materials, cohesive contact finite element, concrete, plasticity.Este trabalho trata da modelagem numérica do comportamento mecânico em materiais quase-frágeis, tal como o concreto. Para este fim, um modelo 2D de escala mesoscópica baseado no conceito de Elemento de Volume Representativo (EVR) é apresentado. O material é considerado como composto por três fases consistindo de zona de interface, matriz e inclusões, onde cada constituinte é modelado independentemente. O EVR consiste de inclusões idealizadas como de forma circular dispostas de maneira simétrica e não simétrica. A zona de interface é modelada por meio de elementos finitos coesivos de contato. A inclusão é modelada como sendo um material elástico linear, já a matriz é considerada como material elastoplástico. Nosso principal objetivo é mostrar que uma formulação baseada na homogeneização computacional é uma alternativa aos modelos constitutivos macroscópicos complexos para o comportamento mecânico de matérias frágeis usando um procedimento baseado no Método dos Elementos Finitos no âmbito de uma teoria multi-escala. Além disso, o trabalho foca na fundamental importância em representar os fenômenos dissipativos na Zona de Transição para obter uma resposta microestrutural de um material complexo como o concreto. Uma série de exemplos envolvendo processos de microfissuração é apresentada de modo a ilustrar o desempenho da modelagem proposta.Palavras-chave: homogeneização, materiais quase-frágeis, elemento finito coesivo, concreto, plasticidade

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Section: Figurementioning

confidence: 99%

Evaluation of a proposed model for concrete at mesoscopic scale

Borges

Quaresma

Fernandes

et al. 2017

Rev. IBRACON Estrut. Mater.

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“…Furthermore, with the facility of standard explicit FE code, various types of constitutive theories for composite analysis can be easily accommodated into the FE framework. Pituba et al [57] developed a contact FE in order to capture the effects of phase debonding, interface crack closure or opening, and the cracking process inside the matrix of fiber-reinforced composites. Zuo et al [58] developed the wavelet FE method adopting B-spline wavelet on the interval to investigate static and free vibration problems of laminated composite plates.…”

Section: Composite Materials and Structuresmentioning

confidence: 99%

Basic research on machinery fault diagnostics: Past, present, and future trends

et al. 2017

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Machinery fault diagnosis has progressed over the past decades with the evolution of machineries in terms of complexity and scale. High-value machineries require condition monitoring and fault diagnosis to guarantee their designed functions and performance throughout their lifetime. Research on machinery Fault diagnostics has grown rapidly in recent years. This paper attempts to summarize and review the recent R&D trends in the basic research field of machinery fault diagnosis in terms of four main aspects: Fault mechanism, sensor technique and signal acquisition, signal processing, and intelligent diagnostics. The review discusses the special contributions of Chinese scholars to machinery fault diagnostics. On the basis of the review of basic theory of machinery fault diagnosis and its practical applications in engineering, the paper concludes with a brief discussion on the future trends and challenges in machinery fault diagnosis.

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“…Other aspect is related to the capabilities increasing of the computational devices allowing the development of the constitutive models and numerical techniques. Due to the similar characteristics of the mechanical behavior at macroscopic level, many constitutive models based on continuum mechanics and thermodynamics of solids have been proposed for limited applications in several cases, Peric et al (2010), Nguyen et al (2011) and Pituba et al (2016). This limitation is evident when dealing with materials composed of heterogeneous microstructures resulting in constitutive models with complex formulation and many parameters to identify (Karamnedjad et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

“…In this context, this work intends to contribute to the knowledge about yield surface for metallic materials with inclusions perfectly bonded and the influence of the weak interface in the yield surface using simple constitutive models at microscopic level within a purely kinematical multiscale framework. For this propose, the weak interface is modeled by a recently proposed contact and fracture model in Pituba et al (2016). This model represents the decohesion process in matrix/inclusion interface leading to a proper representation about the homogenized macroscopic behavior of the material.…”

Section: Introductionmentioning

confidence: 99%

“…In this work, a finite-element procedure proposed by Peric et al (2010) and extended by Pituba et al (2016) to take into account the fracture process in the EVR within a purely kinematical multiscale framework is used to simulate the mechanical behavior of metal matrix composites considering the influence of the phase debonding. For Giusti et al (2009), the need for more precise responses has improved the studies on the lower scales leading to the development of multiscale theories, which use informations from different scales to obtain the material response.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Yield Surfaces of Material Composed of Porous and Heterogeneous Microstructures Considering Phase Debonding

Santos

Pituba

2017

Lat. Am. j. solids struct.

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This work deals with numerical simulation of the mechanical behavior of materials composed of heterogeneous ductile microstructures using a multi-scale approach considering plasticity processes and phase debonding. Due to few studies about yield surfaces of metal matrix composites (MMC) with weak interfaces presented in the literature, the major goal of this work is to propose yield surfaces for metal matrix composites reinforced by rigid inclusions. The yield surfaces are obtained for Representative Volume Elements (RVEs) of materials presenting perfectly bonded inclusions and phase debonding in the interface zone. The matrix is considered an ideally plastic material governed by von Mises model, whereas the interface zone is modeled by means contact and fracture constitutive models incorporated in a proposed finite element. Also, RVEs containing different distributions and volume ratios of voids are analyzed. Considering the phase debonding, for compressive loadings the RVE behaves like RVE with perfectly bonded inclusions whereas for tension loadings the RVE presents a behavior quite similar to the one with voids. On the other hand, the concentration of voids in the RVE decreases its mechanical strength.

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Modeling of Cohesive Fracture and Plasticity Processes in Composite Microstructures

Cited by 17 publications

References 38 publications

Evaluation of a proposed model for concrete at mesoscopic scale

Evaluation of a proposed model for concrete at mesoscopic scale

Basic research on machinery fault diagnostics: Past, present, and future trends

Yield Surfaces of Material Composed of Porous and Heterogeneous Microstructures Considering Phase Debonding

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