Article
Chemistry, Physical
K. Sudhakar, G. Plummer, G. J. Tucker, M. W. Barsoum
Summary: Kink boundaries, KBs, in metals are well defined entities that are identical to low angle grain boundaries, LAGBs, at low disregistry angles. Ripplocations, defined as atomic scale ripples, form ripplocation boundaries, RBs, when nested on adjacent planes. RBs in layered crystalline solids, LCS, have delocalized strain fields, delaminate at high curvatures, form nanobridges, and are highly strained and reversible if not trapped. The distinction between KBs and RBs is important for understanding deformation and failure.
Article
Chemistry, Physical
Chunhe Wang, Chunhuan Guo, Ruonan Qin, Fengchun Jiang
Summary: In this study, a layered structure reinforced composite metal foam (LS-CMF) was designed and fabricated using metal fiber grids, stainless steel hollow spheres, and aluminum alloy through the casting method. The physical parameters, microstructure, and compression performance of LS-CMF were characterized, revealing an increased average stress plateau strength. The deformation mechanisms of CMF and LS-CMF were also discussed to provide insights into their performance.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Yuto Nakasuji, Hidetoshi Somekawa, Motohiro Yuasa, Hiroyuki Miyamoto, Michiaki Yamasaki, Yoshihito Kawamura
Summary: This study quantified the kink-band strengthening effect in a Mg-9%Y-6%Zn alloy through uniaxial hot compression. The increase in hardness due to kink-band strengthening was found to be closely related to the number of kink boundaries beneath the indentation. The estimated kink-band strengthening values from microscopic analysis were similar to those obtained from prior macroscopic analysis.
Article
Polymer Science
John P. Mikhail, Gregory C. Rutledge
Summary: Semicrystalline polymers have potential applications as protective armor due to their attractive shock dissipation characteristics. This study analyzed the mechanisms for energy storage and dissipation in semicrystalline polyethylene, and found that plastic deformation and melting of the crystalline domain are the major mechanisms.
Article
Chemistry, Multidisciplinary
Xiao-Wen Lei, Shungo Shimizu, Jin-Xing Shi
Summary: This study investigates the interlayer deformation of graphite under compression using molecular dynamics simulation and proposes a differential geometrical method to evaluate kink deformation. The effects of the number of graphene layers and lattice chirality on the mechanical behaviors of graphite are discussed. The results show that kink deformation occurs in compressed graphite when the strain is approximately 0.02.
Article
Nanoscience & Nanotechnology
Koji Hagihara, Toko Tokunaga, Katsuaki Nishiura, Shohei Uemichi, Shuhei Ohsawa
Summary: Controlling the morphology of kink bands can effectively improve the strength and ductility of aluminum alloys. The microstructure plays a significant role in the formation of kink bands and the mechanical properties of the material. By varying the microstructural control, the role of the deformation kink band can be changed from a fracture mode to a deformation mode, leading to a large increase in yield stress while maintaining ductility.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Physics, Applied
Liqiang Xu, Quan Sun, Yebo Lu
Summary: The currently available flexible strain sensors are mainly used for human motion recognition and medical health detection, while there is an urgent need for sensors to realize real-time monitoring of the 3D deformation of industrial and agricultural products. In this study, a flexible strain sensor with a hat-shaped structure was fabricated to perform in situ measurement of 3D deformation. An algorithm for resistance change detection and linear calibration equations were proposed to analyze the deformation data and calculate local shape changes. The sensor was applied to monitor the growth deformation of a kumquat fruit with highly consistent results. The proposed technique has great potential for application to 3D deformation detection of flexible objects.
APPLIED PHYSICS LETTERS
(2023)
Article
Mathematics
Shami A. M. Alsallami, Syed T. R. Rizvi, Aly R. Seadawy
Summary: We investigate the stochastic-fractional Drinfel'd-Sokolov-Wilson (SFDSW) equations for various wave solutions and interactions, including cross-kink rational waves, periodic cross-rational waves, homoclinic breather waves, M-shaped rational solutions, and M-shaped solutions with kink waves. These solutions have applications in mathematical physics, surface physics, plasma physics, population dynamics, and applied sciences. Graphical representations of the results are provided in different dimensions, obtained under certain constraint conditions.
Article
Chemistry, Physical
Hussein O. Badr, Michel W. Barsoum
Summary: The micromechanism for the deformation of layered crystalline solids (LCSs) has long been assumed to be basal dislocations alone. However, observations made during graphite deformation cannot be explained by basal dislocations alone. This study introduces the concept of ripplocation, where atomic layers buckle and form ripple-like structures. These ripplocation boundaries (RBs) propagate and cause energy dissipation during cyclic loading. The study also suggests that RBs can be precursors of kink boundaries (KBs), which are irreversible. The characteristics of deformation by ripplocations include nano-ligaments, pileups around spherical indentations, and fully reversible stress-strain curves.
Article
Engineering, Chemical
Qiangqiang Song, Yuqing Lin, Takafumi Ueda, Qin Shen, Kueir-Rarn Lee, Tomohisa Yoshioka, Hideto Matsuyama
Summary: This study reports an interlayered thin-film composite membrane with ultrahigh water permeance and enhanced rejection of inorganic salts. Detailed mechanistic investigations reveal the structural features that lead to improved membrane separation performance. This provides a foundation for the engineering of high-performance TFC membranes.
JOURNAL OF MEMBRANE SCIENCE
(2022)
Article
Polymer Science
Liudmila A. Makarova, Iuliia A. Alekhina, Marat F. Khairullin, Rodion A. Makarin, Nikolai S. Perov
Summary: Multilayered magnetoelectric materials with tunable properties and high values of magnetoelectric effect are highly regarded for investigations. This study focuses on a flexible double-layered structure consisting of a piezoelectric polymer and a magnetoactive elastomer (MAE) with iron particles. By applying a gradient AC magnetic field, the structure exhibits bending deformation, resulting in the resonant enhancement of the magnetoelectric effect. The resonant frequency depends on the properties of the MAE, such as thickness and iron particle concentration, as well as the bias DC magnetic field. The findings have potential for expanding the application area of these devices in energy harvesting.
Article
Automation & Control Systems
Dingqiang Peng, Liming Wang, Chris K. Mechefske, Yimin Shao
Summary: The study established a comprehensive position prediction model that can effectively predict and compensate for machining position errors of low-rigidity workpieces, improving machining accuracy.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2021)
Article
Engineering, Environmental
Xiaoming Sun, Wenchao Zhao, Fuxin Shen, Jian Wang, Li Cui, Ming Jiang
Summary: In this paper, two physical model tests were conducted to study the deformation failure mechanism of a deep-buried tunnel in inclined layered strata and the supporting effects of constant resistance and large deformation anchor cables. The deformation and failure process of surrounding rocks and the strain fields were obtained using non-contact deformation and displacement test system, strain data acquisition system, and camera. The results showed that the deformation of the tunnel in the inclined thin-layer rock strata was asymmetrical, with bending fracture failure in the left arch shoulder and shear slip failure in the right arch shoulder. The key failure position was located in the left arch shoulder of the tunnel. When using the asymmetric constant resistance and large deformation anchor cable model, the strain field was transferred to the deep rock strata, achieving deformation coordination between deep and shallow rock strata and significantly reducing the deformation and strain field of surrounding rocks.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2023)
Article
Materials Science, Multidisciplinary
James G. McHugh, Pavlos Mouratidis, Kenny Jolley
Summary: In this study, basal dislocations and ripplocations in layered materials were investigated using analytical and computational techniques. It was found that the energetic and structural scaling factors of surface ripplocations are closely related to the physics of a classical carpet ruck. Simulations showed that the lowest-energy structure of dislocation pileups in layered materials is the ripplocation, while large dislocation pileups in bulk graphite exhibited multilayer delamination, curvature, and voids, providing a concise explanation for the large volumetric expansion seen in irradiated graphite.
Review
Materials Science, Multidisciplinary
Yue Yu, Juanjuan Wang, Xue Han, Shuguang Yang, Gaihong An, Conghua Lu
Summary: This review summarizes the fabrication methods, actuation mechanisms, and applications of fiber-shaped soft actuators (FSAs) in different fields. The development tendency of FSAs is also discussed.
ADVANCED FIBER MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Jin-Xing Shi, Keiichiro Ohmura, Masatoshi Shimoda, Xiao-Wen Lei
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2018)
Article
Materials Science, Multidisciplinary
Yi Yan, Akihiro Nakatani
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2019)
Article
Biophysics
Yi Yan, Akihiro Nakatani
JOURNAL OF BIOMECHANICS
(2019)
Article
Mechanics
Yi Yan, Akihiro Nakatani
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2020)
Review
Chemistry, Analytical
Jin-Xing Shi, Xiao-Wen Lei, Toshiaki Natsuki
Summary: This paper reviews recent studies on carbon nanomaterials-based nano-force and nano-mass sensors, introduces the mechanism of frequency-based nano sensors, and summarizes modeling approaches and material property determination. Carbon nanomaterials exhibit higher sensitivity and performance in nano-mechanical sensors compared to traditional materials like silicon and ZnO, suggesting further investigations and potential applications in the future.
Article
Chemistry, Multidisciplinary
So Nagashima, Akihiro Nakatani
Summary: This study presents a method for causing wrinkles to evolve into folds using water droplets and investigates the impact of capillary forces on this process. The folded areas can be controlled by adjusting the volume and number of droplets.
Article
Chemistry, Multidisciplinary
Xiao-Wen Lei, Kazuki Bando, Jin-Xing Shi
Summary: Carbon nanomaterials, such as CNTs and GSs, are used as resonators in vibration-based nanomechanical sensors due to their high stiffness and small size. DNTs, a new class of one-dimensional carbon nanomaterials, have diamond-like structures with sp(3) bonds formed by covalent interactions between multiple benzene molecules. By studying DNTs with lattice defects, the research shows that Young's modulus and natural frequency can be controlled by altering the density of defects, and DNTs have potential applications in nano-sensors.
Article
Chemistry, Multidisciplinary
So Nagashima, Sun Mi Yoon, Do Hyun Kim, Akihiro Nakatani, Myoung-Woon Moon
Summary: This paper introduces a bottom-up method for quickly assembling DNA molecules into periodically aligned nanowires, using superhydrophilic wrinkles and a hydrophobic flat surface. The inter-nanowire separation can be controlled by adjusting the wrinkle dimensions. This method offers a general and flexible pathway for the facile assembly of spatially organized nanowires, creating new opportunities for nanoelectronics, photonics, and biology devices.
ADVANCED MATERIALS INTERFACES
(2022)
Article
Chemistry, Multidisciplinary
Yoshitada Tomioka, Toshiaki Natsuki, Jin-Xing Shi, Xiao-Wen Lei
Summary: The study focuses on evaluating the impact characteristics of carbon nanomaterials, particularly the newly designed wavy graphene sheets, which demonstrate enhanced resistance to kinetic energy with increased disclination density. Impact tests show that the wavy graphene sheets possess excellent impact behavior, showing potential application as high-impact-resistant components in advanced NEMS.
Article
Chemistry, Multidisciplinary
Xiao-Wen Lei, Shungo Shimizu, Jin-Xing Shi
Summary: This study investigates the interlayer deformation of graphite under compression using molecular dynamics simulation and proposes a differential geometrical method to evaluate kink deformation. The effects of the number of graphene layers and lattice chirality on the mechanical behaviors of graphite are discussed. The results show that kink deformation occurs in compressed graphite when the strain is approximately 0.02.
Article
Materials Science, Multidisciplinary
Mengying Li, Xiao-Wen Lei
Summary: In this study, the mechanical properties of graphene/aluminum (Gr/Al) composites were investigated using molecular dynamics simulations. The addition of graphene significantly improved the stiffness and strength of the composites by preventing the propagation of dislocations at the interface. The deformation mechanism of the composites, as well as the dislocation movement in the aluminum matrix and the deformation characteristics of graphene, were studied.
COMPUTATIONAL MATERIALS SCIENCE
(2022)
Article
Physics, Mathematical
Shigeki Matsutani, Hiroshi Nishiguchi, Kenji Higashida, Akihiro Nakatani, Hiroyasu Hamada
JOURNAL OF GEOMETRY AND SYMMETRY IN PHYSICS
(2019)
Article
Mathematics, Interdisciplinary Applications
Naoki Higashiyama, Yusuke Doi, Akihiro Nakatani
IEICE NONLINEAR THEORY AND ITS APPLICATIONS
(2017)
Article
Materials Science, Multidisciplinary
Xiao-Wen Lei, Akihiro Nakatani
COMPUTATIONAL MATERIALS SCIENCE
(2017)
