A Coarse-Grained Lattice Spring Model to Characterize Nanoindented Stem Cells

2021 ◽  
pp. 623-629
Author(s):  
Lorenzo Vaiani ◽  
Michele Fiorentino ◽  
Michele Gattullo ◽  
Vito Modesto Manghisi ◽  
Antonio Emmanuele Uva ◽  
...  
Keyword(s):  
Stem Cells ◽  
Coarse Grained ◽  
Spring Model ◽  
Lattice Spring Model

A Perfectly Matched Layer Technique for the Lattice Spring Model

2020 ◽  
Author(s):  
J. Tang ◽  
H. Zhou ◽  
M. Xia ◽  
C. Jiang ◽  
H. Chen ◽  
...  
Keyword(s):  
Perfectly Matched Layer ◽  
Spring Model ◽  
Lattice Spring Model ◽  
Layer Technique

Comparison of neutral and charged polyelectrolyte bottlebrush polymers in dilute salt-free conditions

MRS Advances ◽  
2020 ◽  
Vol 5 (17) ◽  
pp. 899-906
Author(s):  
Alexandros Chremos ◽  
Ferenc Horkay
Keyword(s):  
Coarse Grained ◽  
Side Chains ◽  
Spring Model ◽  
Static Structure ◽  
Polymer Swelling ◽  
Additional Peak ◽  
Structure Factors ◽  
Explicit Solvent ◽  
Dynamics Simulations ◽  
Repulsive Forces

ABSTRACTWe investigate the structure of neutral and charged bottlebrush polymers in salt-free solutions at different polymer concentrations. In particular, we use molecular dynamics simulations by utilizing a coarse-grained bead-spring model that includes an explicit solvent and complementary experiments made by small angle neutron scattering (SANS). We find that the charged groups along the side chains exert significant repulsive forces, resulting in polymer swelling and backbone stretching. In addition to the primary polyelectrolyte peak, we find that bottlebrush polymers exhibit an additional peak in the form and static structure factors, a feature that is absent in neutral polymers. We show that this additional peak describes the intra-molecular correlations between the charged side chains.

Application of the four-dimensional lattice spring model for blasting wave propagation around the underground rock cavern

2018 ◽  
Vol 82 ◽  
pp. 135-147 ◽  
Author(s):  
Xiao-Dong Hu ◽  
Gao-Feng Zhao ◽  
Xi-Fei Deng ◽  
Yi-Fei Hao ◽  
Li-Feng Fan ◽  
...  
Keyword(s):  
Wave Propagation ◽  
Spring Model ◽  
Dimensional Lattice ◽  
Lattice Spring Model ◽  
Rock Cavern ◽  
Blasting Wave

scholarly journals Modeling the Contact Mechanics of Hydrogels

Lubricants ◽  
2019 ◽  
Vol 7 (4) ◽  
pp. 35
Author(s):  
Martin H. Müser ◽  
Han Li ◽  
Roland Bennewitz
Keyword(s):  
Contact Mechanics ◽  
Feasibility Study ◽  
Three Dimensions ◽  
Coarse Grained ◽  
Length Scale ◽  
Two Dimensional ◽  
Spring Model ◽  
Mechanical Pressure ◽  
Solvent Quality ◽  
A Chain

A computationally lean model for the coarse-grained description of contact mechanics of hydrogels is proposed and characterized. It consists of a simple bead-spring model for the interaction within a chain, potentials describing the interaction between monomers and mold or confining walls, and a coarse-grained potential reflecting the solvent-mediated effective repulsion between non-bonded monomers. Moreover, crosslinking only takes place after the polymers have equilibrated in their mold. As such, the model is able to reflect the density, solvent quality, and the mold hydrophobicity that existed during the crosslinking of the polymers. Finally, such produced hydrogels are exposed to sinusoidal indenters. The simulations reveal a wavevector-dependent effective modulus E * ( q ) with the following properties: (i) stiffening under mechanical pressure, and a sensitivity of E * ( q ) on (ii) the degree of crosslinking at large wavelengths, (iii) the solvent quality, and (iv) the hydrophobicity of the mold in which the polymers were crosslinked. Finally, the simulations provide evidence that the elastic heterogeneity inherent to hydrogels can suffice to pin a compressed hydrogel to a microscopically frictionless wall that is undulated at a mesoscopic length scale. Although the model and simulations of this feasibility study are only two-dimensional, its generalization to three dimensions can be achieved in a straightforward fashion.

An Overview and Recent Developments of Distinct Lattice Spring Model on Dynamic Fracturing of Rock

2014 ◽  
Vol 553 ◽  
pp. 507-512
Author(s):  
Gao Feng Zhao ◽  
Nasser Khalili
Keyword(s):  
Element Model ◽  
Discrete Element Model ◽  
Spring Model ◽  
Basic Principles ◽  
Lattice Spring Model ◽  
Recent Developments ◽  
Distinct Lattice Spring Model ◽  
Dynamic Fracturing ◽  
Dynamics Problems ◽  
Macroscopic Parameters

This paper presents some recent developments of the Distinct Lattice Spring Model (DLSM) on dynamic fracturing of rock. The DLSM is a micromechanics based discrete numerical model for rock dynamics problems. It provides an alternative tool for rock mechanics study. Compared with the classical Discrete Element Model (DEM), the DLSM can directly use macroscopic parameters without any requirement for calibration process. Another significant advantage is that the DLSM uses only half of the degree of freedoms, and therefore, is more computational efficient. Because of these advantages, it has been used in a number of fields, e.g., dynamic fracturing, wave propagation, and nuclear waste disposition. In this work, the basic principles of the DLSM and its latest developments will be outlined.

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