An equivalent elastoplastic damage model based on micromechanics for hybrid fiber-reinforced composites under uniaxial tension

Yan, Zhiguo; Zhang, Yao; Ju, J. W.; Chen, Qing; Zhu, Hehua

doi:10.1177/1056789517744425

Cited by 39 publications

(36 citation statements)

References 88 publications

(162 reference statements)

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“…According to the similarity of the damage and healing process for the MD-based model and the CDM-based model, the net damage variable dnet has the same expression as that in previous work (Chen et al., 2018a, 2018b; Hong et al., 2015a, 2015b, 2016a, 2016b; Ju et al., 2012a, 2012b; Wu and Ju, 2017; Yan et al., 2019; Yang et al., 2017; Zhang et al., 2019; Zhou et al., 2017). At high temperatures, the net damage variable dnet decreases and the material can be healed.…”

Section: Simulation Detailsmentioning

confidence: 99%

The damage and healing of quartz under radiation at high temperatures

Zhou

2019

International Journal of Damage Mechanics

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The effect of radiation on silica has attracted significant attention due to its potential application where radiation exists. However, the nature of the atomistic defects of quartz formed during the radiation-induced damage at high temperatures has not been fully elucidated. Molecular dynamics is adopted to investigate the damage-healing behavior of the quartz at high temperatures in this research. The ensuing diffusion and recovery of point defects in the irradiated specimen at high temperatures are simulated. The high temperature reduces the number of point defects. At 1400 K, all point defects are removed, while only some point defects are erased at 700 K. It is illustrated that the over-coordinated atoms are the main source of point defects at 300 K and 700 K. The temperature influences the configuration of point defects. The healing variable of the molecular dynamics model is subsequently developed to describe the healing process. The healing mechanisms of the irradiated specimen at high temperatures are summarized by analyzing the trajectories of atoms in detail. These results are helpful to understand the nature of radiation damage in quartz at high temperatures.

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Section: Simulation Detailsmentioning

confidence: 99%

The damage and healing of quartz under radiation at high temperatures

Zhou

2019

International Journal of Damage Mechanics

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“…Model (37) 2 is valid for a Hookean matrix deformation with spherical microvoids [see Equation (20)]. According to Santaoja [11,30,36], it is valid for a Hookean matrix deformation with penny-shaped microcracks and for rectilinear microcracks in a 2D solid [12], although for these latter two cases the damage strain tensor has to be made symmetric.…”

Section: Analytical Relation Between the Stress Tensors σ And σ For Tmentioning

confidence: 99%

“…The energy expressions including the void volume fraction or microcrack f densities are obtained by using a more or less strict micromechanical survey. Q r It is both preferable and more popular, as several papers [13], [14], [15], [16], [17], [18], [19], [20] indicate, just simply to refer to some of the many studies on this topic. The Gurson Model [21] for simulation of the response of plastic yield in a porous material is a good example of an old micromechanical model which is still in active use, although now in enhanced form and referred to as Gurson-Tvergaard-Needelman [22].…”

Section: Introductionmentioning

confidence: 99%

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On continuum damage mechanics

Santaoja

2019

RakMek

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A material containing spherical microvoids with a Hookean matrix response was shown to take the appearance usually applied in continuum damage mechanics. However, the commonly used variable damage was replaced with the void volume fraction , D f which has a clear physical meaning, and the elastic strain tensor with the damage-elastic g e strain tensor. The postulate of strain equivalence with the effective stress concept was g de reformulated and applied to a case where the response of the matrix obeys Hooke's law. In contrast to many other studies, in the derived relation between the effective stress tensor and the stress tensor , the tensor is symmetric. A uniaxial bar model σ σσ was introduce for clarifying the derived results. Other candidates for damage were demonstrated by studying the effect of carbide coarsening on creep rate.

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“…Fire accidents present challenges to the safety and operation of civil engineering structures during construction and services, such as high-rise buildings and underground structures (Chen et al, 2016;Ju and Wu, 2015;Kale and Ostoja-Starzewski, 2016;Park et al, 2016;Wu and Ju, 2016;Yan et al, 2017). Mechanical degradation of concrete exposed to high temperatures has been taken into consideration on the fire-resistant design of fiber-reinforced composites (Xiao and Ko¨nig, 2004;Ziao et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

A novel multi-scale model for predicting the thermal damage of hybrid fiber-reinforced concrete

Zhang

Zhu

et al. 2019

International Journal of Damage Mechanics

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A multi-scale micromechanical model is proposed to predict the damage degree of hybrid fiber-reinforced concrete under or after high temperatures. The thermal degradation of hybrid fiber-reinforced concrete is generally composed of the damage of the cement paste caused by thermal decomposition and thermal incompatibility, the deterioration of aggregates and fibers, and the interfacial damage between aggregates and the matrix. In this multi-scale model, four levels of hybrid fiber-reinforced concrete structures are considered when the thermal damage degree is derived; namely, the equivalent calcium silicate hydrate (C–S–H) product level, the cement paste level, the concrete level, and the hybrid fiber-reinforced concrete level. At the cement paste level, thermal decompositions of C–S–H product and calcium hydroxide are taken into account. In addition, a dimensionless parameter of the crack density is introduced to represent the thermal cracking of the matrix. At the concrete level, the interfacial damage of aggregates is simulated by a spring–interface model, in which the interfacial parameters are assumed to be functions of temperature. Moreover, at the cement paste level and the hybrid fiber-reinforced concrete level, a sub-stepping homogenization method is proposed to determine the effective properties. Comparisons between previously published experimental data and predictions and discussions illustrate the feasibility of the proposed multi-scale model in predicting thermal damage of concrete and hybrid fiber-reinforced concrete.

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An equivalent elastoplastic damage model based on micromechanics for hybrid fiber-reinforced composites under uniaxial tension

Cited by 39 publications

References 88 publications

The damage and healing of quartz under radiation at high temperatures

The damage and healing of quartz under radiation at high temperatures

On continuum damage mechanics

A novel multi-scale model for predicting the thermal damage of hybrid fiber-reinforced concrete

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