Spherical indentation model for evaluating the elastic properties of the shell of microsphere with core-shell structure

Sun, Yiheng; Peng, Guangjian; Hu, Yahao; Dou, Guijing; Chen, Peijian; Zhang, Taihua

doi:10.1016/j.ijsolstr.2021.111159

Cited by 12 publications

(5 citation statements)

References 45 publications

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“…And thus, he also considered that the microcapsule ruptures first in the equatorial region. Contradictory to the above conclusion, Sun [17] demonstrated that the polar region of the microcapsule is the region where the external load is in direct contact with the capsule wall, and therefore he indicated that the polar region is the location where the stress is the highest and the damage occurs first, which is similar to the findings of Zhang [4] and Yin [18]. Moreover, in their further studies, they have shown that during the dynamic damage process of a single microcapsule, the crack extends from one pole to another along the meridian, and the damage can only evolve into a single main crack due to the instantaneous release of energy during rupture.…”

Section: Introductionmentioning

confidence: 93%

WITHDRAWN: Cross-scale modeling of Microencapsulated self-healing composite with multiphase medium and their damage competition behavior

Yin,

Li,

Huang

2024

Preprint

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Constructing a high-fidelity cross-scale numerical model is the primary challenge in the multiscale analysis of multiphase medium composites. Considering the limitations of the Finite Element Method (FEM) in the study of the dynamic damage problem of non-homogeneous and discontinuous materials, the Discrete Element Method (DEM) is used in this study to build a three-medium multiscale numerical model containing aggregates, matrix, and microcapsules. Further, the dynamic damage problem of microcapsules embedded in self-healing composites and the damage competition issues between the microcapsules and the matrix are investigated. The results indicate that (1) The damage evolution process, the location of maximum damage, and the final damage pattern of microcapsule embedded in the matrix and exposed to the ideal environment differed considerably. (2) The effect of microcapsule volume fraction on the mechanical strength of the matrix in self-healing composites is not linearly negatively correlated, but instead, there is a non-linear relationship, which is highly dependent on the strength ratio of the microcapsule to the matrix. (3) In self-healing composites, damage competition between the microcapsules and the matrix has a decisive influence on triggering the self-healing mechanism. (4) To obtain a better self-healing effect, the microcapsule volume fraction in the self-healing composites should not exceed 1.5%, and the mechanical strength pre-maintenance should not be more than 95% of the failure strength. The multiphase medium & multiscale analysis method proposed in this study also provides a new approach for visualizing the progressive dynamic damage problem in self-healing composites.

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Section: Introductionmentioning

confidence: 93%

WITHDRAWN: Cross-scale modeling of Microencapsulated self-healing composite with multiphase medium and their damage competition behavior

Yin,

Li,

Huang

2024

Preprint

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“…The rupture load of the microcapsule also depends on the microcapsule diameter and shell thickness. 40 To ensure that the measurement of the rupture loads of microcapsules is meaningful, the diameters and shell thicknesses of prepared microcapsules were carefully investigated. The diameter distributions of microcapsules were presented in Figure 5.…”

Section: Morphological Structures and Size Distributionmentioning

confidence: 99%

Improvement of the rupture strength of MF shell microcapsule by incorporating TiO₂ nanoparticles with an optimal content

Dou,

Lu,

et al. 2023

J of Applied Polymer Sci

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Microencapsulated phase change materials (MPCMs) are usually subjected to internal pressure caused by core volume changes or external mechanical stress during service. It is of great importance for individual microcapsule to achieve good mechanical performance to be effective in avoiding the leakage of core material and providing crucial protection to environment. Here, n‐octadecane was selected as core material and different amounts of titanium dioxide (TiO2) nanoparticles were added into the melamine formaldehyde (MF) shell, forming n‐octadecane@MF‐TiO2 hybrid shell MPCMs by in situ polymerization. It has been confirmed that TiO2 nanoparticles had been well embedded in the network structure of MF shell. The doping of TiO2 is beneficial to the inhibition of supercooling and the improvement of the thermal stability for hybrid shell microcapsules. Microcompression tests were conducted to determine the rupture loads of prepared microcapsules. TiO2 nanoreinforcements increase the rupture loads of MF‐TiO2 shell microcapsules and the improvement percentage in rupture load reaches a maximum of 138.14% at TiO2 content of 2 wt.% compared with pristine microcapsules. Crack deflection and pinning may account for the potential strengthening mechanism of the MF nanocomposites. The reinforced MPCMs will contribute to their more promising and widespread applications in thermal energy storage systems.

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“…[52] Polymer products, such as films, coatings, nanofibers, microcapsules, and interleaves, with at least one dimension at the microlevel possess excellent mechanical properties compared with their macroscopic counterparts. [53,54] The mechanical properties of the fiber can be controlled by adjusting the diameter, diameter distribution, and morphology of the nanofibers, which are determined by the effective parameters. [55] The size dependence can be explained by the chain alignment and supramolecular structure.…”

Section: Effective Parameters For Electrospinningmentioning

confidence: 99%

Desired properties and corresponding improvement measures of electrospun nanofibers for membrane distillation, reinforcement, and self‐healing applications

Xia

Peng

et al. 2021

Polymer Engineering & Sci

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Electrospun nanofibers have promising properties and serve an important role in various applications ranging from biomedical engineering to mechanical engineering. Although electrospun nanofibers are not used worldwide, the limited research conducted thus far provides a rudimentary understanding of nanofibers and explores the potential areas that have attracted attention for commercialization. However, the lack of a comprehensive understanding of the properties of nanofibers in various applications severely limits their functionality. This review provides clear insights into modifying the morphology of nanofibers by adjusting various parameters to meet specific application requirements. Various applications, including membrane distillation, reinforcement, and self‐healing, and the corresponding desired properties are discussed in detail. Approaches for enhancing the application‐specific properties of electrospun nanofibers are also discussed. This discussion provides significant guidance for the design of novel electrospun composites with excellent properties. Finally, the challenges in research and the opportunities for future development are presented.

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Spherical indentation model for evaluating the elastic properties of the shell of microsphere with core-shell structure

Cited by 12 publications

References 45 publications

WITHDRAWN: Cross-scale modeling of Microencapsulated self-healing composite with multiphase medium and their damage competition behavior

WITHDRAWN: Cross-scale modeling of Microencapsulated self-healing composite with multiphase medium and their damage competition behavior

Improvement of the rupture strength of MF shell microcapsule by incorporating TiO₂ nanoparticles with an optimal content

Desired properties and corresponding improvement measures of electrospun nanofibers for membrane distillation, reinforcement, and self‐healing applications

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Spherical indentation model for evaluating the elastic properties of the shell of microsphere with core-shell structure

Cited by 12 publications

References 45 publications

WITHDRAWN: Cross-scale modeling of Microencapsulated self-healing composite with multiphase medium and their damage competition behavior

WITHDRAWN: Cross-scale modeling of Microencapsulated self-healing composite with multiphase medium and their damage competition behavior

Improvement of the rupture strength of MF shell microcapsule by incorporating TiO2 nanoparticles with an optimal content

Desired properties and corresponding improvement measures of electrospun nanofibers for membrane distillation, reinforcement, and self‐healing applications

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Improvement of the rupture strength of MF shell microcapsule by incorporating TiO₂ nanoparticles with an optimal content