Article
Mechanics
Yingpeng Zhuo, Zhaohui Qi, Jian Zhang, Gang Wang
Summary: This paper proposes a geometrically nonlinear spring element for structural analysis of helical springs. By selecting characteristic parameters describing their shape regulations as variables, the structure of helical springs can be accurately approximated with less parameters, improving the computational efficiency.
ARCHIVE OF APPLIED MECHANICS
(2022)
Article
Engineering, Mechanical
Kyriakos Alexandros Chondrogiannis, Vasilis Dertimanis, Boris Jeremic, Eleni Chatzi
Summary: This study develops a scheme called the NegSV device that utilizes a geometrically nonlinear mechanism to create a negative stiffness system for vibration attenuation. The device successfully alters the stiffness characteristics of the primary system and improves the overall dynamics without additional mass requirements. Experimental testing on a 3-dimensional frame structure demonstrates a reduction in acceleration and inter-storey drift response below the retrofit, while nonlinear finite element analyses show agreement with the experimental measurements and offer potential for further improvement of the mechanism's design. The proposed nonlinear device shows significant potential in attenuating structural vibration and offers ease of installation.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Materials Science, Composites
Chao Yang, Bing Wang, Shuncong Zhong, Chenmin Zhao, Wei Liang
Summary: A novel manufacturing method is developed to tailor the deployable mechanism of a bistable composite tape-spring (CTS) structure through heat treatment. The study shows that different deployable mechanisms can be achieved based on the same CTS structure. The heat treatment process can adjust the internal stress levels of the CTS structure, thus altering its deploying performance. These findings are of great importance for the application of CTS structures in aerospace explorations.
COMPOSITES COMMUNICATIONS
(2022)
Article
Engineering, Mechanical
Yi Yang, Yawen Qin, Yaqi Tang, Yang Yang, Yan Peng, Huayan Pu
Summary: This research introduces two novel deployable closed-loop tape-spring manipulators with mobile drive components, investigates the buckling stability space, stiffness, and deviation angles of the moving platform, and develops an improved W-shaped deployable manipulator. Experimental validation of the design and analysis is conducted with the fabrication of two prototypes.
MECHANISM AND MACHINE THEORY
(2022)
Article
Mechanics
Yanan Yuan, Xiaofang Zhang, Xinyue Li, Qiang Zhang, Qifang Yin, Wei Liu, Zuoqi Zhang
Summary: This paper investigates the low compressive strength of composite laminates after impact and proposes a new research approach of microstructure design to manipulate impact damage modes. Two design strategies, thin-ply and bouligand structure, are employed to achieve four typical impact damage modes. Numerical results show that excessive or insufficient ply thickness or pitch angle leads to more severe impact damage and significantly reduces the compressive strength.
ENGINEERING FRACTURE MECHANICS
(2022)
Article
Materials Science, Multidisciplinary
Hiroyuki Kato, Hitoshi Suzuki
Summary: A mechanics-of-materials theory was developed to analyze the nonlinear deflection of helical spring within and beyond the elasticity limit, considering the combined stresses of torsion and bending and assuming elastic-perfect plastic material. Experimental results showed that the stress-strain curve of a piano wire closely matched the elastic-perfect plastic one. The outcome of the theory was compared with experimental results of nonlinear load-deflection curves in plastically extended helical spring made of piano wire.
MECHANICS OF MATERIALS
(2021)
Article
Engineering, Aerospace
Hao Jin, Qilong Jia, Ning An, Guiping Zhao, Xiaofei Ma, Jinxiong Zhou
Summary: This paper addresses the cut-out shape optimization of a composite tape-spring hinge (CTSH) using data-driven surrogate modeling and shape optimization. The optimized CTSH shows increased stored strain energy and bending moment during deployment compared to the initial design.
Article
Engineering, Mechanical
Jiulin Wu, Lizhan Zeng, Bin Han, Yifan Zhou, Xin Luo, Xiaoqing Li, Xuedong Chen, Wei Jiang
Summary: By proposing a novel compact arrayed-magnetic-spring with negative stiffness (AMS-NS), this paper makes innovative progress in paralleling magnetic negative stiffness with positive stiffness, demonstrating the effective reduction of resonance frequency with AMS-NS. Parametric studies and dynamic experiments further confirm the high negative stiffness density and good isolation performance of AMS-NS.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2022)
Article
Mechanics
Xuan Zhang, Yuan Liu, Xibin Cao, Lin Zhao, Weilong Yin, Qingyang Deng
Summary: In order to achieve the fine and high reliability design of laminated composite plates, the uncertainties of geometric and material parameters, as well as the nonlinear mechanical characteristics, are taken into account. A novel method using a multiscale feature extraction and fusion network (MFEFN) is proposed to solve the uncertain natural characteristics. Theoretical analyses and sensitivity analysis are conducted to investigate the influences of random parameters on the natural characteristics. The research results provide theoretical basis and technical means for accurate analysis and optimal design of laminated structures.
COMPOSITE STRUCTURES
(2023)
Article
Engineering, Mechanical
Ke Jun, Xu Jingen, Wu Zhenyu, Ying Zhiping
Summary: Compared with steel helical springs widely used in automobiles, composite helical springs with nonlinear stiffness (NS-CHS) not only have obvious advantages such as significant lightweight effect and corrosion resistance, but also provide the optimal stiffness according to the requirements of automobile suspension under different working conditions, which is of great significance for the dynamic performance and comfort of automobiles. In this study, a theoretical model for stiffness matching design and structure optimization of NS-CHS was established. The key influencing factors of stiffness, the FEM analysis method and the manufacturing process of NS-CHS were studied, and the model was verified by related test results. The proposed theoretical model not only considers the main features of the composite structure and the anisotropy of composite material, but also provides a new numerical method for the design and structure optimization of composite elastic structures with helical shape.
JOURNAL OF THE BRAZILIAN SOCIETY OF MECHANICAL SCIENCES AND ENGINEERING
(2022)
Article
Engineering, Geological
J. Zhang, A. Deng, M. Jaksa
Summary: The study showed that adding up to 1% fibers to micaceous soil can increase its compressive strength and material stiffness, while adding 1.5% fibers can further enhance ductility. Additionally, the combination of fibers with hydrated lime or slag-lime can further improve the strength and stiffness of micaceous soil.
JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING
(2021)
Article
Materials Science, Composites
Qian Jiang, Ye Qiao, Feng Zhao, Zhongxiang Pan, Xianyan Wu, Liwei Wu, Hongjun Fu
Summary: A novel composite helical spring with skin-core structure was designed and fabricated, improving torsion and bending performance by wrapping the core with a knitting tube. Finite element analysis showed that the skin-core structure enhances the stiffness and load-carrying capacity of the spring.
POLYMER COMPOSITES
(2021)
Article
Construction & Building Technology
M. Alimoradzadeh, S. D. Akbas
Summary: This investigation focuses on the nonlinear free vibration of a carbon nanotube reinforced composite beam using the Von Karman nonlinearity and the Euler-Bernoulli beam theory. The structure's material properties are considered as a polymeric matrix reinforced by carbon nanotubes with different material distributions. The governing equations of the nonlinear vibration problem are derived using Hamilton's principle and solved by discretizing the equations into nonlinear ordinary differential equations using Galerkin's decomposition technique and multiple time scale method to obtain the nonlinear natural frequency and free response considering different reinforcement patterns.
STEEL AND COMPOSITE STRUCTURES
(2023)
Article
Mechanics
Zhang Xiaoyong, Cai Shihan, Wang Zhouhua, Qiao Huiyun, Lin Guixing, Wu Xiaolei, Chen Yu
Summary: This research investigates the mechanical properties of ultra-high performance fiber reinforced cement-based composite (UHPFRC) after exposure to elevated temperatures. The result shows that the compressive strength and axial compressive strength of UHPFRC are improved after exposure to high temperatures, while the effect on flexural strength is not significant. The addition of steel fibers greatly improves the cube compressive strength, axial compressive strength, and flexural strength of UHPFRC.
COMPOSITE STRUCTURES
(2022)
Article
Construction & Building Technology
Alaa M. Morsy, Abd Elmoaty M. B. Abd Elmoaty, Abdelrhman B. Harraz
Summary: This paper developed an artificial neural network (ANN) model to predict the mechanical properties of engineered cementitious composites (ECC). The model showed outstanding predictive performance with accuracy near 100%. Additional evaluation using experimental data confirmed the accuracy of the model.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2022)
Article
Mechanics
Jiang-Bo Bai, Tian-Wei Liu, Zhen-Zhou Wang, Qiu-Hong Lin, Qiang Cong, Yu-Feng Wang, Jiang-Nan Ran, Dong Li, Guang-Yu Bu
Summary: The study focuses on optimizing the design variables of composite helical structures using Genetic Algorithms to maximize compressive stiffness and minimize weight. The selection of MOEA/D as the best algorithm for searching designs of maximum compressive stiffness and minimum weight is crucial.
COMPOSITE STRUCTURES
(2021)
Article
Mechanics
Tian-Wei Liu, Jiang-Bo Bai, Nicholas Fantuzzi, Guang-Yu Bu, Dong Li
Summary: This paper presents multi-objective optimisation designs for thin-walled deployable composite hinges (DCHs), considering three conflicting objectives and four design variables. Various surrogate models and Genetic Algorithms were used for optimal designs, with significance to practical engineering application.
COMPOSITE STRUCTURES
(2022)
Article
Materials Science, Multidisciplinary
Tian-Wei Liu, Jiang-Bo Bai, Nicholas Fantuzzi
Summary: This paper establishes analytical models for predicting the folding moment and the ultimate coiling radius of the thin-walled lenticular deployable composite boom. By using the non-dominated sorting genetic algorithm III, an optimization framework is proposed and 48 design points that are better than the test sample are found on the Pareto front.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2023)
Article
Engineering, Aerospace
Tian-Wei Liu, Jiang-Bo Bai, Nicholas Fantuzzi, Hao-Tian Xi, Hao Xu, Shao-Lin Li, Peng-Cheng Cao
Summary: This paper investigates the folding behavior of thin-walled tubular deployable composite boom (DCB) using experimental and numerical simulation methods. DCB specimens were prepared using T700/epoxy unidirectional reinforced prepreg and a folding mechanism was designed for the folding experiments. The folding moment versus rotational displacement curves were measured and a Finite Element Model (FEM) was established to predict the folding behavior of the DCB considering different failure criteria. The research results are of great significance for the practical engineering application of the DCB.
Article
Engineering, Aerospace
Tian-Wei Liu, Jiang-Bo Bai, Nicholas Fantuzzi
Summary: This paper investigates the folding behaviour of the thin-walled tubular deployable composite boom (DCB) using analytical modeling. An analytical model to predict the folding moment versus rotational displacement of the DCB was presented based on the Archimedes' helix. The failure indices in the folding processes were calculated using Tsai-Hill and maximum stress criteria. The influence of geometric parameters on the folding behaviour of the DCB was further studied using the analytical model.
Article
Engineering, Aerospace
Jiang -Bo Bai, Tian -Wei Liu, Guang-Hao Yang, Chang-Chuan Xie, Sen Mao
Summary: This paper proposes a variable camber wing (VCW) based on corrugated flexible composite skin (FCS) and designs and validates its variable camber function through experiments. Firstly, the conceptual design of the VCW is presented and the effectiveness and feasibility of the conceptual design are discussed. Moreover, FCS specimens are prepared using carbon/epoxy unidirectional reinforced prepreg as raw material, and the tensile behavior of the FCS is analyzed and validated by numerical simulation. In addition, a VCW prototype is manufactured according to the design scheme, and the variable camber experiment is performed to validate the variable camber function. Lastly, a finite element analysis (FEA) model is established to predict the variable camber function of the VCW, and the FEA results are compared with experimental results, showing good agreement.
AEROSPACE SCIENCE AND TECHNOLOGY
(2023)
Article
Engineering, Aerospace
Tian-Wei Liu, Jiang-Bo Bai, Zhen-Zhou Wang, Nicholas Fantuzzi
Summary: This study proposes an improved two-parameter analytical model to predict the folded stable state of the bistable deployable composite boom (Bi-DCB), and verifies its accuracy. The results show that the Bi-DCB has superior mechanical properties and ease of deployment, making it a promising alternative for deployable structures.
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)
