Mechanics of materials with embedded unstable molecules

Brighenti, Roberto; Artoni, Federico; Cosma, Mattia Pancrazio

doi:10.1016/j.ijsolstr.2018.11.022

Cited by 12 publications

(7 citation statements)

References 52 publications

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“…This method was later extended by Moon et al [21]; they described a smectic LCN, where translational symmetry is addressed by considering the longer-ranged molecular interactions through the coarse-grained molecular model, which is another layer of multi-scaling. Furthermore, a micromechanical approach toward spontaneous behavior is presented by Brighenti et al [19,81]. The statistical changes in the polymeric chains are correlated with the stimuli-induced shift in chain length (Figure 8), which is similar to the descriptive model using molecular dynamics simulation [18] and statistical polymer physics [82].…”

Section: Eigenstrain Modelsmentioning

confidence: 66%

Recent Trends in Continuum Modeling of Liquid Crystal Networks: A Mini-Review

Park

Moon

et al. 2023

Polymers

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This work aims to provide a comprehensive review of the continuum models of the phase behaviors of liquid crystal networks (LCNs), novel materials with various engineering applications thanks to their unique composition of polymer and liquid crystal. Two distinct behaviors are primarily considered: soft elasticity and spontaneous deformation found in the material. First, we revisit these characteristic phase behaviors, followed by an introduction of various constitutive models with diverse techniques and fidelities in describing the phase behaviors. We also present finite element models that predict these behaviors, emphasizing the importance of such models in predicting the material’s behavior. By disseminating various models essential to understanding the underlying physics of the behavior, we hope to help researchers and engineers harness the material’s full potential. Finally, we discuss future research directions necessary to advance our understanding of LCNs further and enable more sophisticated and precise control of their properties. Overall, this review provides a comprehensive understanding of the state-of-the-art techniques and models used to analyze the behavior of LCNs and their potential for various engineering applications.

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Section: Eigenstrain Modelsmentioning

confidence: 66%

Recent Trends in Continuum Modeling of Liquid Crystal Networks: A Mini-Review

Park

Moon

et al. 2023

Polymers

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“…Elastomers become responsive to external stimuli by harnessing the active character of molecules or moieties embedded in their network backbone. Mechanophores are examples of molecules that undergo physical or chemical transformations in the presence of mechanical stresses [53], [54]. During activation, their polymer chains are reconfigured, and a reverse process returns these chains to their initial state.…”

Section: Extension Of the Statistical Chain Distribution To Ordered Chain Arrangementmentioning

confidence: 99%

“…A transition between the two states occurs when a sufficient amount of energy is imparted to the system, allowing the energy barrier that separates the two states to be overcome [54], [55]. Within this context, when LCEs are exposed to a sufficiently intense source of thermal energy or light, they lose their initial nematic order and assume a disordered isotropic mesogen arrangement.…”

Section: Extension Of the Statistical Chain Distribution To Ordered Chain Arrangementmentioning

confidence: 99%

A micromechanical-based model of stimulus responsive liquid crystal elastomers

Brighenti

McMahan

Cosma

et al. 2021

International Journal of Solids and Structures

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This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

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“…P , p being the first Piola stress tensor and the hydrostatic pressure enforcing the isochoric deformation, respectively, while J = detF is the volumetric deformation. 19 Correspondingly, the Cauchy stress is given by…”

Section: Mechanics Of Polymer's Networkmentioning

confidence: 99%

Photopolymerized additive manufacturing materials: Modeling of the printing process, mechanical behavior, and sensitivity analysis

Cosma

Brighenti

2021

Mat Design & Process Comms

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The physical-chemical processes involved in light-induced polymerization (photopolymerization) are widely exploited in additive manufacturing (AM) technologies such as Stereolithography and Digital Light Processing. The influence of the AM process parameters on the physical properties of manufactured components has been often investigated through empirical methods based on the trial and error approach, that is, by collecting and interpreting a large amount of experimental data. However, when desired physical properties are required, accurate modeling of the liquid-solid conversion is necessary. In this work, in order to determine the properties of the resulting material according to the adopted process setup, we present a multi-physics approach to model the physical-chemical transformation taking place in photopolymerization. The role played on the final mechanical properties by the laser light intensity and by its moving speed is considered. Further, the influence of the uncertainty of the process parameters is investigated through a sensitivity analysis. The proposed approach is suitable for investigating the reliability of additively manufactured components as well as for their design according to an optimum printing strategy. From the perspective of making innovative functional materials, the proposed multi-physics model allows tuning the printing process in order to get the desired distribution of mechanical properties.

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Mechanics of materials with embedded unstable molecules

Cited by 12 publications

References 52 publications

Recent Trends in Continuum Modeling of Liquid Crystal Networks: A Mini-Review

Recent Trends in Continuum Modeling of Liquid Crystal Networks: A Mini-Review

A micromechanical-based model of stimulus responsive liquid crystal elastomers

Photopolymerized additive manufacturing materials: Modeling of the printing process, mechanical behavior, and sensitivity analysis

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