Article
Engineering, Mechanical
Jin-Hong Jiang, Xu Yin, Guang-Kui Xu, Zi-Yu Wang, Li-Yuan Zhang
Summary: This paper proposes a novel type of tensegrity that can be easily converted into different types of tensegrities, providing a unified approach for their form-finding. By establishing unified form-finding models, the self-equilibrium and super-stability conditions of various types of tensegrities can be directly determined.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Nanoscience & Nanotechnology
King C. Lai, Minda Chen, Jiaqi Yu, Yong Han, Wenyu Huang, James W. Evans
Summary: Metallic nanocrystals can be synthesized with tailored nonequilibrium shapes for enhanced properties, but stability against thermal reshaping is crucial. Research shows that the reshaping of metal octahedra is influenced by the degree of truncation of vertices, with the optimal pathway involving transfer of atoms at low temperatures.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Analytical
Chin -Wei Wu, Ming -Hung Chiang, Chien-Liang Lee
Summary: In this study, core-shell PdAu octahedrons (Oct), PdAu truncated octahedrons (t-Oct), and PdAu nanocubes (NC) were successfully synthesized, and their specific activities in glucose oxidation reaction (GOR) and glucose sensors were systematically studied. The kinetic studies showed that the specific activities (S-A1) of the nanocrystals followed the order of t-Oct > Oct > NC, indicating that glucose easily bonded to t-Oct with the (211) facet. However, the specific activity (S-A2), estimated by the moles of electrons over ECSA, showed the order of Oct > t-Oct > NC. The facile electron transfer of GORs occurred via PdAu Oct with an electron-rich Au shell. Additionally, PdAu Oct demonstrated high recoveries when used as a glucose sensor for energy drinks.
MICROCHEMICAL JOURNAL
(2023)
Article
Materials Science, Multidisciplinary
Jianhua Dong, Hualin Fan
Summary: The study focused on buckling-oriented hexagonal lattice structures (BOHLS) made of AISI 316 L for energy absorption in engineering. Quasi-static compression experiments and numerical investigations were conducted to compare the performance of BOHLS and hexagonal lattice structure (HLS) in different compression directions. The results showed that BOHLS had better performance in terms of specific energy absorption and mean crushing force under quasi-static in-plane compression, while HLS outperformed BOHLS in quasi-static out-of-plane compression.
MECHANICS OF MATERIALS
(2022)
Article
Chemistry, Physical
Caikun Cheng, Jingjing Wei, Zhijie Yang
Summary: The addition of trace amounts of water molecules in nonpolar solvents can drive the assembly of inorganic nanocrystals into superstructures with increasing complexities. By tuning the amount of water, nanocrystals can be directed to assemble into different superstructures, showcasing the potential for engineering nanocrystal assembly pathways.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Engineering, Electrical & Electronic
Xiaohe Yan, Hongcai Zhang, Chenghong Gu, Nian Liu, Furong Li, Yonghua Song
Summary: This paper proposes a dynamic pricing signal for energy storage (ES) operation based on the truncated strategy, aiming to reduce the network investment cost. The design includes an operation strategy for ES to optimize network investment considering uncertainties, as well as a time of use (ToU) pricing scheme to reflect the impact of ES operation on network investment. The proposed method demonstrates a significant reduction in network charges with ES operation, ensuring fairness and efficiency of the pricing signal.
JOURNAL OF MODERN POWER SYSTEMS AND CLEAN ENERGY
(2023)
Article
Engineering, Civil
C. Y. Wang
Summary: This paper explores rings with rigid segments and rotationally flexible joints under compressive forces, finding exact closed-form expressions for the buckling forces through geometry and symmetry. Depending on the force application, the ring may exhibit different buckling behaviors, including regular pitchfork bifurcation, nonlinear snap-through, and hysteresis. The buckling properties of square and hexagonal rings are significant as they serve as unit cells for larger structures like honeycomb, graphene, and tensegrity structures.
Article
Engineering, Manufacturing
Long Liu, Bing Yi, Tianci Wang, Zhizhong Li, Junhui Zhang, Gil Ho Yoon
Summary: By extending the SIMP method with linear buckling load factors and total volume constraints instead of local volume constraints, the proposed method can efficiently construct functionally graded lattice structure, improving stability and stiffness. Numerical analysis and mechanics experiments have validated the effectiveness of the method.
ADDITIVE MANUFACTURING
(2021)
Article
Engineering, Mechanical
Mao Yang, Bin Han, Pengbo Su, Qi Zhang, Qiancheng Zhang, Zhenyu Zhao, Changye Ni, Tian Jian Lu
Summary: By increasing the number of corrugations or layers in the corrugated core, more stable and plastic hinges are formed, leading to significant coupling effects that enhance the HTCS's resistance to buckling and energy absorption.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2021)
Article
Mathematics
Sheldon Dantas, Gonzalo Martinez-Cervantes, Jose David Rodriguez Abellan, Abraham Rueda Zoca
Summary: This paper examines octahedral norms in free Banach lattices generated by a Banach space E, proving their properties under various conditions. The study also shows that the norm of the free Banach lattice generated by a Banach space of dimension >= 2 is nowhere Frechet differentiable. Several open problems on this topic are discussed as well.
REVISTA DE LA REAL ACADEMIA DE CIENCIAS EXACTAS FISICAS Y NATURALES SERIE A-MATEMATICAS
(2021)
Article
Chemistry, Physical
Guolang Zhou, Linlin Chen, Xiaowei Li, Guiling Luo, Zhendong Yu, Jingzhou Yin, Lei Fan, Yanhong Chao, Lei Jiang, Wenshuai Zhu
Summary: The extraction of lithium from salt lakes or seawater has garnered global attention due to the skyrocketing demand for lithium products. The LiMn2O4-based electrochemical lithium recovery system, known for its high inserted capacity and low energy consumption, emerges as a frontrunner for commercial application. However, the surface properties of LiMn2O4 that enable Li diffusion also result in manganese dissolution, posing a great challenge to achieving high lithium inserted capacity and long lifespan concurrently. In this study, we tackle this issue by designing a truncated octahedral LiMn2O4 (Tr-oh LMO) where the dominant (111) facets minimize Mn dissolution while a small portion of (100) facets facilitates Li diffusion. As a result, this Tr-oh LMO-based electrochemical lithium recovery system exhibits excellent Li recovery performance with a high inserted capacity of 20.25 mg g-1 per cycle in simulated brine. Furthermore, the manganese dissolution rate per 30 cycles is only 0.44%, and the capacity maintains 85% of the initial value after 30 cycles. These promising findings accelerate the practical application of LiMn2O4 in electrochemical lithium recovery.
GREEN ENERGY & ENVIRONMENT
(2023)
Article
Materials Science, Multidisciplinary
Xiaoyang Wang, Lei Zhu, Liao Sun, Nan Li
Summary: A new optimization framework is developed for the optimal design of graded lattice structures, integrating fillet designs as well as yield and buckling constraints. A case study shows that the optimized beams have improved structural safety and reduced compliance.
MATERIALS & DESIGN
(2021)
Article
Engineering, Multidisciplinary
Quan-Wei Li, Bo-Hua Sun
Summary: The biomimetic design of engineering structures aims to improve mechanical properties by imitating biological structures. However, current biomimetic structures are not as good as many biomaterials. By studying the structure of E. aspergillum, a lattice structure inspired by it was proposed and its mechanical properties surpassed E. aspergillum. This lattice structure can be applied to engineering structures to improve strength and reduce redundancy of material.
BIOINSPIRATION & BIOMIMETICS
(2023)
Article
Engineering, Mechanical
Jianwei Sun, Songyu Zhang, Zhenyu Wang, Guangsheng Song, Meiling Zhang, Jinkui Chu
Summary: This paper proposes a new foot structure based on the mast-type octahedral tensegrity structure with flexibility, self-stability, and self-adaptability. The stability of the foot structure is ensured by adding a locking structure based on a ratchet structure. The function of the new foot structure is verified through the fabrication of a physical prototype.
MECHANISM AND MACHINE THEORY
(2022)
Article
Engineering, Manufacturing
Claudio Intrigila, Andrea Micheletti, Nicola A. Nodargi, Paolo Bisegna
Summary: Recent developments in additive manufacturing have led to the design and fabrication of multistable lattice chains with exceptional mechanical properties. These chains, composed of chiral tensegrity-like units, demonstrate a highly nonlinear bistable response with compression-twisting coupling. Experimental characterization and a predictive semi-analytical model are used to validate the desired multistable behavior of the chains. This research provides a flexible platform for programmable materials and potential applications in modular chains using other types of tensegrity-like units.
ADDITIVE MANUFACTURING
(2023)
Article
Architecture
Baoshi Jiang, Jingyao Zhang, Makoto Ohsaki
Summary: This paper presents a novel method of shape and topology optimization to find the optimal branching structure for supporting large-span structures, such as free-form roofs. The method models the branching structure as a cable-net and considers reaction forces from the roof as external loads. Numerical examples show that the method can be easily applied to 2D problems, with potential solutions for relaxing constraints on reaction forces in 3D problems.
JOURNAL OF ASIAN ARCHITECTURE AND BUILDING ENGINEERING
(2022)
Article
Computer Science, Artificial Intelligence
Kazuki Hayashi, Makoto Ohsaki
Summary: A combined method of graph embedding and reinforcement learning is developed for discrete cross-section optimization of planar steel frames. The proposed method uses an improved graph embedding formulation to extract edge features associated with members. The trained agent estimates accurate returns for each action and adjusts the size of members accordingly.
ADVANCED ENGINEERING INFORMATICS
(2022)
Article
Engineering, Civil
Bach Do, Makoto Ohsaki
Summary: This work introduces a novel sequential sampling approach for multi-objective reliability-based design optimization of moment-resisting steel frames under earthquake excitation, utilizing nonlinear response history analysis and Gaussian process models to alleviate computational burden, updating approximate solutions through discrete random searches, and improving GP models and sampling points after each optimization iteration. The method demonstrates quick termination and robustness by distributing new sampling points near exact solutions, resulting in consistently good approximate solutions.
EARTHQUAKE ENGINEERING & STRUCTURAL DYNAMICS
(2022)
Article
Engineering, Civil
Wei Shen, Makoto Ohsaki, Makoto Yamakawa
Summary: In this study, a reliability-based shape and topology optimization method for plane frames is proposed, with the quantile estimated using the maximum entropy method and an iterative scheme employed to solve deterministic optimization problems. The force density method is applied for simultaneous shape and topology optimization. The results demonstrate the effectiveness and feasibility of the proposed method.
Article
Engineering, Civil
Riree Takeoka, Makoto Ohsaki, Yusuke Sakai
Summary: This paper proposes a shape design method for free-form shells, which allows the distribution of horizontal reaction forces along the boundary and the projection of stresses onto the horizontal plane to be specified. A parametric form is used to model the shape of the shell, with the vertical coordinate defined as a graph surface in terms of the horizontal coordinates. Numerical examples demonstrate that various shapes can be generated by specifying the horizontal reaction forces, and a static finite element analysis confirms that the stresses are sufficiently close to the specified values even considering the deformation under selfweight.
ENGINEERING STRUCTURES
(2022)
Article
Mathematics, Applied
Aarohi Shah, Julian J. Rimoli
Summary: A new framework is introduced to develop data-driven dimensionally-reduced surrogate models at the component level, termed smart parts (SPs), to establish a direct relationship between input-output parameters of components. This approach utilizes advanced machine learning techniques to preserve all information related to history and nonlinearities, allowing for straightforward application to a diverse set of engineering problems without imposing restrictions on analysis types. Results show that SPs significantly reduce computational cost while maintaining accuracy, enabling analysis of complex assemblies in the nonlinear regime.
FINITE ELEMENTS IN ANALYSIS AND DESIGN
(2022)
Article
Materials Science, Multidisciplinary
Christine A. Gebara, Paul D. Lytal, Julian J. Rimoli
Summary: In the past decade, the use of complex deployable structures on CubeSats and large-scale spacecraft has become increasingly common. Traditional manufacturing challenges have led to advancements in metal additive manufacturing technology, opening up new possibilities for aerospace hardware.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2022)
Article
Engineering, Multidisciplinary
Aarohi Shah, Julian J. Rimoli
Summary: This study proposes a method that utilizes machine learning techniques to develop a surrogate model and homogenize heterogeneous structures, aiming to improve computational efficiency and simplify analysis. The approach, which expands the operational frequency spectrum and improves prediction resolution, is not limited to specific material types or heterogeneities.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2022)
Article
Engineering, Aerospace
Hernan J. Logarzo, Julian J. Rimoli
Summary: Understanding the behavior of materials exposed to plasma is crucial for the design of electric propulsion devices. A plasma-material interaction model is introduced in this study to capture the evolution of surface features at the macroscopic scale on materials exposed to plasma over a long period of time. The results show that the model is able to reproduce both the mean erosion rate and the macroscopic anomalous ridges that appear after long exposure, highlighting the importance of considering complex thermomechanical material behavior.
JOURNAL OF PROPULSION AND POWER
(2023)
Article
Engineering, Civil
Zulin Huang, Hongjun Liu, Jingyao Zhang, Zhengliang Li, Makoto Ohsaki, Qiang Bai
Summary: Based on experimental tests and numerical simulations, a new design formula for the effective length coefficient of cross bracing in transmission towers has been proposed. The formula improves the consistency and reliability of predicting the ultimate strength, thus enhancing the accuracy of design calculations according to the Chinese design code.
THIN-WALLED STRUCTURES
(2023)
Article
Physics, Applied
Han Wang, Julian J. Rimoli, Penghui Cao
Summary: By using atomistic simulations, we investigated a range of nanotwinned materials with different stacking fault energies (SFEs) to understand the limit of twin boundary (TB) strengthening. In contrast to Cu and Al, nanotwinned materials with ultra-low SFEs (Co, NiCoCr, and NiCoCrFeMn) exhibited continuous strengthening down to a twin thickness of 0.63 nm. Our study revealed that even at the nanometer scale, hard dislocation modes persisted while the soft dislocation mode, which caused detwinning in Cu and Al, resulted in phase transformation and lamellar structure formation in Co, NiCoCr, and NiCoCrFeMn. This enhanced understanding of dislocation mechanisms in nanotwinned materials showcases the potential for controlling mechanical behavior and ultimate strength through tunable composition and SFE, particularly in multi-principal element alloys.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Engineering, Civil
Qiang Zeng, Makoto Ohsaki, Jingyao Zhang, Shaojun Zhu, Zhengning Li, Xiaonong Guo
Summary: This paper proposes a fast and automatic method to generate structured triangular meshes for free-form SLRSs, which has been successfully applied to various types of free-form SLRSs.
ENGINEERING STRUCTURES
(2023)
Article
Engineering, Mechanical
Ryo Watada, Makoto Ohsaki
Summary: This article proposes a systematic method for designing deployable structures using hinge joints with inclined axis, which allows for a rich variety of deformations. The proposed structure, called N-gonal multilayer symmetric revolute linkage (N-MLSRL), consists of multiple layers that can be deformed from a regular frame into a straight rod shape. For N less than or equal to 3, the structure has a single degree-of-freedom. The method is applied to various numerical examples, such as a horn-shaped structure, a ball-shaped structure, and a dome-shaped structure, to validate its effectiveness.
JOURNAL OF MECHANICAL DESIGN
(2023)
Article
Architecture
Jiro Takagi, Akari Hayashi, Kazuki Saito, Makoto Ohsaki
Summary: Superior design solutions (SDSs) for seven-story steel buildings are obtained for the space frame system (SFS) and the perimeter frame system (PFS) in various types of structures. These solutions meet the design constraints of allowable stress design (ASD) and calculations of resistance and limit state (CRLS) with minimized steel volume. The influences of design conditions are comparatively evaluated, where it is found that the maximum inter-story drift ratio for the safety limit in the CRLS for moment frames (MF) can be defined as 2%, and ASD can be more dominant for buildings with buckling restrained braces (BRBF).
JAPAN ARCHITECTURAL REVIEW
(2023)
Article
Architecture
Jingyao Zhang, Makoto Ohsaki
Summary: This paper presents an approach for designing globally developable architectural surfaces, which have zero Gaussian curvature at every interior node. The approach breaks down the highly non-linear design problem into two sub-problems: finding member lengths of a triangular mesh with zero Gaussian curvature, and optimizing the final geometry subject to boundary and length constraints. Numerical examples demonstrate the efficiency and accuracy of solving these sub-problems. The paper also introduces an improved circle packing scheme for better conformality in the Ricci flow algorithm.
JAPAN ARCHITECTURAL REVIEW
(2023)
Article
Mechanics
Rawan Aqel, Patrick Severson, Rani Elhajjar
Summary: A novel core splice joint configuration for composite sandwich structures is studied and proposed to improve the strength and toughness. Experimental and numerical efforts show that this configuration can significantly increase the ultimate strength by 13% to 51% and the toughness by 2% to 35%.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Xianheng Wang, Cong Chen, Jinsong Zhang, Xinming Qiu
Summary: In this paper, a new form-finding method based on spatial elastica model (FMSE) is proposed for elastic gridshells. The method integrates the deformations of elastic rods into the overall deformation of the gridshell, and solves a set of transcendental equations using the quasi-Newton method to ensure the deformation satisfies the given boundary conditions. The method is validated through experiments and expected to have potential applications in the investigations of elastic gridshells.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Hao Huang, Zitong Guo, Zhongde Shan, Zheng Sun, Jianhua Liu, Dong Wang, Wang Wang, Jiale Liu, Chenchen Tan
Summary: The conventional evaluation of 3D braided composites' mechanical properties through numerical and experimental methodologies hinders material application due to the expenses, time constraints, and laborious efforts involved. This study establishes a multi-scale finite element model and a surrogate model for predicting the elastic properties of 3D4D rotary braided composites with voids. By optimizing a neural network model, the results are validated and provide valuable insights into the microstructure and properties of these composites.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Xinyu Li, Hao Zhang, Haiyang Yang, Junrong Luo, Zhongmin Xiao, Hongshuai Lei
Summary: Due to their excellent mechanical properties and design flexibility, fluted-core composite sandwich structures have gained significant attention in aerospace and rail transit applications. This study investigated the free-vibration characteristics and optimized design of composite fluted-core sandwich cylinders through theoretical models and experimental tests.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Chao Li, Chunzheng Duan, Xiaodong Tian, Chao Wang
Summary: A mechanistic model considering the bottom edge cutting effect and the anisotropic characteristics of the material is proposed in this paper to accurately predict cutting forces. The model was validated through a series of milling experiments and can be used to predict the cutting force of various parts of the cutter and any feed direction.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Camila Sanches Schimidt, Leopoldo Pisanelli Rodrigues de Oliveira, Carlos De Marqui Jr
Summary: This work investigates the vibro-acoustic performance of graded piezoelectric metamaterial plates. The study shows that piezoelectric metamaterial plates with reconfigurable properties can provide enhanced vibration and sound power attenuation.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Jun Ke, Li-jie Liu, Zhen-yu Wu, Zhong-ping Le, Luo Bao, Dong-wei Luo
Summary: Compared with other green natural fibers, ramie has higher mechanical properties and lower cost. In this study, ramie and glass fiber are made into composite circular tubes. The results show that the hybrid circular tube with ramie and glass fiber has improved torsional mechanical properties and reduced weight and cost. The failure mechanisms are affected by the loading direction and the content of each fiber.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Natalia Pingaro, Gabriele Milani
Summary: This paper proposes an enhanced analytical model for predicting the behavior of FRCM samples tested under standard tensile tests. The model takes into account the interaction between fibers and matrix through the interface, and assumes different material properties at different phases. By solving a second order linear differential equation, an analytical solution can be obtained. The model is validated with experimental data and shows good predictability.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Jialiang Fan, Anastasios P. Vassilopoulos, Veronique Michaud
Summary: This article investigates the effects of voids, joint geometry, and test conditions on the fracture performance of thick adhesive Double Cantilever Beam (DCB) joints. It concludes that grooved DCB joints with low void content tested at low displacement rates showed stable crack propagation without significant crack path deviation.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Auwalu I. Mohammed, Kaarthikeyan Raghupathy, Osvaldo De Victoria Garcia Baltazar, Lawson Onokpasah, Roger Carvalho, Anders Mogensen, Farzaneh Hassani, James Njuguna
Summary: This study investigates the performance of composite pressure vessels under damaged and undamaged conditions, providing insights into their reliability and residual strength capabilities. The results demonstrate that the damage profile and its effect on compressive strength are similar between damaged and non-damaged cylinders. When subjected to quasi-static compression, the polyethylene liner absorbs enough elastic strain energy to recover without plastic deformation. Additionally, quasi-static compression has little to no influence on the axial strength of the cylinders. The damage characterization reveals fiber breakage, delamination, local buckling, and brooming failure. This study has direct implications for the safety design tolerances, manufacturing strategies, and operational failure conditions of composite overwrapped pressure vessels (COPVs).
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Muhammad Irfan Shirazi, Samir Khatir, Djilali Boutchicha, Magd Abdel Wahab
Summary: Structural health monitoring is important to ensure the safety of components and structures. This study proposes a method using finite element models and 1D-CNN network to extract and classify vibration responses for crack detection. The results show that the proposed approach is effective in real-time damage detection.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Maryam Mirsalehi, Kiarash Kianpour, Sharif Shahbeyk, Mohammad Bakhshi
Summary: This study comprehensively investigates the one-way response of 3D-woven sandwich panels (3DWSPs) and their interfering parameters, providing interpretation of elastic and failure results, failure maps, and reliable theoretical models for linear elastic response and observed failure mechanisms.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Yiming Zhao, Zhonggang Wang, Zhigang Yang, Bin Qin
Summary: The paper proposes a Ritz and statistical energy analysis (Ritz SEA) hybrid method for calculating rectangular plate acoustic vibration coupling in the mid-frequency range. This method combines the fast convergence and ability to handle arbitrary boundary conditions of the Ritz method with the power flow equation of the statistical energy analysis method. The results show that this approach effectively filters out random fluctuations in mid-frequency domains while demonstrating exceptional stability and precision.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Joao Henrique Fonseca, Woojung Jang, Dosuck Han, Naksoo Kim, Hyungyil Lee
Summary: This study addresses the enhancement of an injection-molded fiber-reinforced plastic / metal hybrid automotive structure and its plastic injection molding process through the integration of the finite element method, artificial intelligence, and evolutionary search methods. Experimental validation of finite element models, the generation of a database through orthogonal array and Latin hypercube methods, and the training of artificial neural networks are conducted. The genetic optimization algorithm is then applied to identify optimal process parameters. The results show significant reduction in product warpage and manufacturing time while maintaining structural strength, contributing to the advancement of composite automotive structures with superior quality.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Alessandro Vescovini, Carina Xiaochen Li, Javier Paz Mendez, Bo Cheng Jin, Andrea Manes, Chiara Bisagni
Summary: This paper presents a study on six single-stringer specimens manufactured using the card-sliding technique with non-crimp fabrics and adopting a Double-Double (DD) stacking sequence. The specimens were tested under compression loading conditions to investigate post-buckling and failure in aerospace structures. Experimental results and numerical simulations were compared to analyze the behavior and failure modes of the specimens. The study found promising evidence of a viable solution to optimize aeronautical structures and enhance resistance to skin-stringer separation, particularly with the use of tapered flanges.
COMPOSITE STRUCTURES
(2024)
