The effect of mechanical-driven volumetric change on instability patterns of bilayered soft solids

Tang, Shan; Li, Ying; Yang, Yang; Zhang, Guo

doi:10.1039/c5sm01614b

Cited by 13 publications

(5 citation statements)

References 45 publications

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“…Note that the bulk modulus K is usually not directly reported in the literature, and here we just set as K = 20 G to mimic the nearly incompressible condition of polymers and soft materials. 57,58 For the magnetic energy density, it can also be precomputed as…”

Section: Computational Model and Benchmarkmentioning

confidence: 99%

Magttice: a lattice model for hard-magnetic soft materials

Liu

Zhang

2021

Soft Matter

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Section: Computational Model and Benchmarkmentioning

confidence: 99%

Magttice: a lattice model for hard-magnetic soft materials

Liu

Zhang

2021

Soft Matter

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“…The critical conditions for the onset and evolution of the perioddoubling instability largely depend on the nonlinear behavior of substrate [38]. Besides certain model non-linearities, Poisson's ratio and substrate prestretch play an important role in triggering period-doubling since they provoke the material nonlinearities [31,34,40,42,43]. The higher instability modes often emerge at large strain levels where both material and geometrical non-linearities in the substrate are prevailing.…”

Section: State Of the Art Review Of Growth-induced Instabilitiesmentioning

confidence: 99%

Computational aspects of morphological instabilities using isogeometric analysis

Dortdivanlioglu

Javili

Linder

2017

Computer Methods in Applied Mechanics and Engineering

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Morphological instabilities play a crucial role in the behavior of living systems as well as advanced engineering applications. Such instabilities initiate when a thin stiff film on a compliant substrate is subject to compressive stresses. For bilayer systems, the first mode of instability is sinusoidal wrinkling. While the critical conditions to induce wrinkling are extensively studied, the more complex patterns formed beyond wrinkling remain elusive and poorly understood. The objective of this contribution is to establish a generic computational framework capable of capturing various instabilities, using isogeometric analysis (IGA) enhanced with a concurrent eigenvalue analysis. It is shown that the eigenvalue analysis provides quantitatively accurate predictions for the onset of instabilities. In addition, the results are compared with the standard finite element analysis (FEA) and it is clearly observed that IGA furnishes significantly more accurate results compared to FEA, for the same number of degrees of freedom. We believe that this generic framework is widely applicable to advance our understanding of emergence and evolution of morphological instabilities for a rich variety of applications in soft materials and living systems.

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“…When a thin film on soft substrate is compressed further beyond the onset of the buckling, new deformation modes may also appear. The patterns of surface instability are summarized in [36,37]. The onset of both buckling and post-buckling are strongly dependent on the modulus ratio between the thin film and substrate, the material property, stress states of the substrate, initial curvature of the surface, and so forth.…”

Section: Introductionmentioning

confidence: 99%

Surface Instability of Bilayer Hydrogel Subjected to Both Compression and Solvent Absorption

Zhou

Guo

et al. 2018

Polymers

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Abstract:The bilayered structure of hard thin film on soft substrate can lose stability and form specific patterns, such as wrinkles or creases, on the surface, induced by external stimuli. For bilayer hydrogels, the surface morphology caused by the instability is usually controlled by the solvent-induced swelling/shrinking and mechanical force. Here, two important issues on the instability of bilayer hydrogels, which were not considered in the previous studies, are focused on in this study. First, the upper layer of a hydrogel is not necessarily too thin. Thus we investigated how the thickness of the upper layer can affect the surface morphology of bilayer hydrogels under compression through both finite element (FE) simulation and theoretical analysis. Second, a hydrogel can absorb water molecules before the mechanical compression. The effect of the pre-absorption of water before the mechanical compression was studied through FE simulations and theoretical analysis. Our results show that when the thickness of the upper layer is very large, surface wrinkles can exist without transforming into period doublings. The pre-absorption of the water can result in folds or unexpected hierarchical wrinkles, which can be realized in experiments through further efforts.

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The effect of mechanical-driven volumetric change on instability patterns of bilayered soft solids

Cited by 13 publications

References 45 publications

Magttice: a lattice model for hard-magnetic soft materials

Magttice: a lattice model for hard-magnetic soft materials

Computational aspects of morphological instabilities using isogeometric analysis

Surface Instability of Bilayer Hydrogel Subjected to Both Compression and Solvent Absorption

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