Acta Mechanica Sinica
     Acta Mechanica Sinica
  Acta Mechanica Sinica--2021, 37 (5)   Published: 30 May 2021
INVITED REVIEW
Molecular simulation-guided and physics-informed mechanistic modeling of multifunctional polymers
Guang Chen · Qiming Wang · Ying Li
Abstract

Polymeric materials have a broad range of mechanical and physical properties. They have been widely used in material science,
biomedical engineering, chemical engineering, and mechanical engineering. The introduction of active elements into
the soft matrix of polymers has enabled much more diversified functionalities of polymeric materials, such as self-healing,
electroactive, magnetosensitive, pH-responsive, and many others. To further enable applications of these multifunc...

THEMED PAPERS ON MECHANICS OF SOFT MATERIALS AND FLEXIBLE STRUCTURES
PREFACE: Mechanics of Soft Materials and Flexible Structures
Haibao Lu · Shaoxing Qu · Xiqiao Feng
Abstract

Soft materials and lexible structures have become essential and hot topic, which is expected to signiicantly promote the research and development of current mechanics, physics, chemistry and life science. Furthermore, the soft materials and lexible structures have attracted enthusiastic attentions due to their great potential and practical applications in deployable structures, morphing structures, sensors, actuators, health-monitoring

A Hyperelastic Model for Polyacrylamide-Gelatin Double Network Shape-Memory Hydrogels
Yifu Chen · Haohui Zhang · Jiehao Chen · Guozheng Kang · Yuhang Hu
Abstract

A shape-memory double network hydrogel consists of two polymer networks: a chemically crosslinked primary network that is responsible for the permanent shape and a physically crosslinked secondary network that is used to fix the temporary shapes. The formation/melting transition of the secondary network serves as an effective mechanism for the double network hydrogel’s shape-memory effect. When the crosslinks in the secondary network are dissociated by applying an external stimulus, onl...

Solvent-aided phase separation in hydrogel towards significantly enhanced mechanoresponsive strength
Haibao Lu · Ziyu Xing · Mingji Chen · Kai Yu · Yong Qing Fu
Abstract

Understanding working principles and thermodynamics behind phase separations, which have significant influences on condensed molecular structures and their performances, can inspire to design and fabricate anomalously and desirably mechanoresponsive hydrogels. However, a combination of techniques from physicochemistry and mechanics has yet been established for the phase separation in hydrogels. In this study, a thermodynamic model is firstly formulated to describe solvent-aided phase and micr...

Cavitation dynamics in a vitrimer
Zhaoqiang Song · Shengqiang Cai
Abstract

Vitrimer is a polymer network with dynamic covalent bonds, which can be dynamically broken and reformed. Thanks to the dynamic covalent bonds, vitrimer behaves like an elastomer at high deformation rate or low temperature but a viscous fluid at low deformation rate or high temperature. In this article, we study the cavitation dynamics in a vitrimer, which is known to be an important damaging mechanism in it. In the formulation, a nonlinear three-dimensional rate-dependent constitutive model f...

Collective migrations in an epithelial–cancerous cell monolayer
Jian Qing Lv · Peng Cheng Chen · Liu Yuan Guan · Wojciech T. Gozdz · Xi Qiao Feng · Bo Li
Abstract

Collective cell migration is extensively observed in embryo development and cancer invasion. During these processes, the interactions between cells with distinct identities and fates are of importance for boundary formation and host defense against cancer. In this paper, we explore the collective dynamics of a two-dimensional cell mixing monolayer consisting of non-tumorigenic mammary epithelial cells and breast cancer cells. We show that the epithelial–cancerous cell mixing system disp...

An improved Carroll's hyperelastic model considering compressibility and its finite element implementation
Stephen Kirwa Melly · Liwu Liu · Yanju Liu · Jinsong Leng
Abstract

In engineering component design, material models are increasingly used in finite element simulations for an expeditious and less costly analysis of the design prototypes. As such, researchers strive to formulate models that are less complex, robust, and accurate. In the realm of hyperelastic materials, phenomenological-based Carroll’s model is highly promising due to its simplicity and accuracy. This work proposes its further improvement by modifying the strain energy density function t...

Swell induced stress in a hydrogel coating
Shuyang Wang · Zhengjin Wang · Yan Yang · Tongqing Lu
Abstract

A hydrogel can be coated on various substrates to enable multiple functions. Potential applications include biomedical devices, anti-fouling surfaces and microfluidics. In practical use, hydrogel coatings are often submerged in fluids. The swell of hydrogel coating deteriorates the interfacial bonding with the substrate. This paper presents a stress analysis of a hydrogel coating on a cylindrical metal substrate. We adopt the thermodynamic theory coupling large deformation and water migration...

EXTREME MECHANICS
Active feedback control of sound radiation in elastic wave metamaterials immersed in water with fluid–solid coupling
Zhi-Hua He · Yi-Ze Wang · Yue-Sheng Wang
Abstract

Due to their potential properties unlike traditional materials and structures, elastic wave metamaterials have received significant interests in recent years. With the coupling between the acoustic and vibration, their mechanical characteristics can be tuned by the active feedback control system at low frequency ranges in which the traditional passive control is limited. This work illustrates that the superior performances of the effective mass density and sound pressure level (SPL) of an ela...

FLUID MECHANICS
Experimental and numerical investigations into flow features in an intake duct for the waterjet propulsion under mooring conditions
Renfang Huang · Ruizhi Zhang · Yiwei Wang · Xianwu Luo · Lei Zhu
Abstract

The waterjet propulsion is widely applied in the marine vessels over 30 knots, and the intake duct is considered as an essential component that strongly relates to the propulsion performance. This paper sheds light on the flow features inside an intake duct under mooring conditions by using the particle image velocimetry (PIV) technique with three-dimensional (3D) numerical simulations. The hydraulic loss gradually increase as the flow-rate increases. According to analyses via the Bernoulli e...

Isogeometric analysis of multi-patch solid-shells in large deformation
Qingyuan Hu · Davide Baroli · Shuzhen Rao
Abstract

In the context of isogeometric analysis (IGA) of shell structures, the popularity of the solid-shell elements benefit from formulation simplicity and full 3D stress state. However some basic questions remain unresolved when using solid-shell element, especially for large deformation cases with patch coupling, which is a common scene in real-life simulations. In this research, after introduction of the solid-shell nonlinear formulation and a fundamental 3D model construction method, we present...

DYNAMICS, VIBRATION, AND CONTROL
Studies on the sound absorption and transmission loss performances of wood-based, natural and waste materials
Hsiao Mun Lee · Wensheng Luo · Jinlong Xie · Guilin Wen · Heow Pueh Lee
Abstract

The sound absorption and sound transmission loss performances of the natural woods, hard and soft processed woods with attachment of the various natural orwastematerials were investigated in the present study using impedance tube with American Society for Testing Material (ASTM) standards. The sound absorption performances of all natural and all hard processed woods were very poor. It was found that filter mat made by the coconut fibre was the best material for sound absorption improvement of...

 
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