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A nano-compression model to characterize the elastic properties of core–shell structured microspheres
https://orcid.org/0000-0002-6189-9174
Abstract Nano-compression is a convenient approach for investigating the elastic modulus of microcapsule shells by compressing a core–shell structured microsphere between two parallel plates in nanoscale. A nano-compression model was developed through energy minimization, which avoids determining the complicated load distribution at interface. The total potential energy of microcapsule includes the work done by compression load and the strain energy of shell and core. By minimizing the total potential energy, the correlation among the compression load, the compression displacement, and the elastic and geometric parameters of microcapsules was derived. With this model, the shell elastic modulus then can be evaluated by fitting the loading responses of microcapsules. To validate the proposed model, nano-compression tests were conducted on PMMA microcapsules. The elastic moduli for PMMA shells evaluated by the nano-compression model agree well with the reference value with a maximum relative error of -12.12%. The elastic moduli of the PMMA shells determined by the nano-compression model were then used in finite element simulations to predict the compression load–displacement curves, which show good agreement with those measured in experiments with a relative error within 9.64%.
Graphical abstract Display Omitted
Highlights A nano-compression model was established via the minimum total potential principle. A deformed pattern was constructed for nano-compression of a microcapsule. The proposed model avoids complicated analysis of contact load distribution. The proposed model has good accuracy in evaluating the elastic modulus of shell. The proposed model can predict compression behavior of microcapsule via FE analysis.
A nano-compression model to characterize the elastic properties of core–shell structured microspheres
https://orcid.org/0000-0002-6189-9174
Abstract Nano-compression is a convenient approach for investigating the elastic modulus of microcapsule shells by compressing a core–shell structured microsphere between two parallel plates in nanoscale. A nano-compression model was developed through energy minimization, which avoids determining the complicated load distribution at interface. The total potential energy of microcapsule includes the work done by compression load and the strain energy of shell and core. By minimizing the total potential energy, the correlation among the compression load, the compression displacement, and the elastic and geometric parameters of microcapsules was derived. With this model, the shell elastic modulus then can be evaluated by fitting the loading responses of microcapsules. To validate the proposed model, nano-compression tests were conducted on PMMA microcapsules. The elastic moduli for PMMA shells evaluated by the nano-compression model agree well with the reference value with a maximum relative error of -12.12%. The elastic moduli of the PMMA shells determined by the nano-compression model were then used in finite element simulations to predict the compression load–displacement curves, which show good agreement with those measured in experiments with a relative error within 9.64%.
Graphical abstract Display Omitted
Highlights A nano-compression model was established via the minimum total potential principle. A deformed pattern was constructed for nano-compression of a microcapsule. The proposed model avoids complicated analysis of contact load distribution. The proposed model has good accuracy in evaluating the elastic modulus of shell. The proposed model can predict compression behavior of microcapsule via FE analysis.
A nano-compression model to characterize the elastic properties of core–shell structured microspheres
https://orcid.org/0000-0002-6189-9174
Abstract Nano-compression is a convenient approach for investigating the elastic modulus of microcapsule shells by compressing a core–shell structured microsphere between two parallel plates in nanoscale. A nano-compression model was developed through energy minimization, which avoids determining the complicated load distribution at interface. The total potential energy of microcapsule includes the work done by compression load and the strain energy of shell and core. By minimizing the total potential energy, the correlation among the compression load, the compression displacement, and the elastic and geometric parameters of microcapsules was derived. With this model, the shell elastic modulus then can be evaluated by fitting the loading responses of microcapsules. To validate the proposed model, nano-compression tests were conducted on PMMA microcapsules. The elastic moduli for PMMA shells evaluated by the nano-compression model agree well with the reference value with a maximum relative error of -12.12%. The elastic moduli of the PMMA shells determined by the nano-compression model were then used in finite element simulations to predict the compression load–displacement curves, which show good agreement with those measured in experiments with a relative error within 9.64%.
Graphical abstract Display Omitted
Highlights A nano-compression model was established via the minimum total potential principle. A deformed pattern was constructed for nano-compression of a microcapsule. The proposed model avoids complicated analysis of contact load distribution. The proposed model has good accuracy in evaluating the elastic modulus of shell. The proposed model can predict compression behavior of microcapsule via FE analysis.
A nano-compression model to characterize the elastic properties of core–shell structured microspheres
Sun, Yiheng (author) / Peng, Guangjian (author) / Dou, Guijing (author) / Hu, Yahao (author) / Chen, Peijian (author) / Zhang, Taihua (author)
Thin-Walled Structures ; 173
2022-01-13
Article (Journal)
Electronic Resource
English
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