Article
Mechanics
Ali Rashed, Eralp Demir
Summary: In this study, an in-house finite element approach is developed to optimize the fundamental frequency of variable stiffness composites while considering manufacturing constraints. The method uses lamination parameters as design variables and computes tow angles and stacking sequence using direct search method. The Least-Squares and Continuity (LSC) method is applied to ensure manufacturability by maintaining fiber continuity. The results of the method are compared to literature findings and show good agreement.
COMPOSITE STRUCTURES
(2022)
Article
Computer Science, Interdisciplinary Applications
Qi Guo, Jiutao Hang, Suian Wang, Wenzhi Hui, Zonghong Xie
Summary: This paper presents an efficient design optimization method assisted by multi-fidelity surrogate models for buckling design of variable stiffness composites. By using hierarchical Kriging and global optimization method, the effectiveness and robustness of the method are demonstrated through two case studies.
STRUCTURAL AND MULTIDISCIPLINARY OPTIMIZATION
(2021)
Article
Engineering, Multidisciplinary
Zhaofei Xiao, Philip Harrison
Summary: The 'Fabric Steering' process introduces a novel low-cost manufacturing technique for producing variable stiffness panels. By manipulating biaxial fabrics, this method offers faster production rates and lower costs compared to Automated Fibre Placement. The computer aided engineering tool SteerFab can predict optimum fiber paths, mechanical behavior, and manufacturing instructions for the process.
COMPOSITES PART B-ENGINEERING
(2021)
Article
Computer Science, Interdisciplinary Applications
Zhihua Wang, Jose Humberto S. Almeida, Aravind Ashok, Zhonglai Wang, Saullo G. P. Castro
Summary: In this study, variable-angle filament-wound (VAFW) cylinders were optimized for minimum mass under manufacturing constraints and various design loads using particle swarm optimization and Kriging-based metamodels. The nonlinear relationship between the tow winding angle and thickness in VAFW structures was explored using a design parameterization based on a second-order polynomial variation. A Bogner-Fox-Schmit-Castro finite element was used to accurately represent the variable stiffness properties of the shells. The analysis of the design space using metamodels revealed a gap in the buckling strength, which was confirmed through genetic algorithm optimizations. Extreme lightweight and buckling-resistant designs were achieved along with non-conventional optimum layouts thanks to the tailored thickness buildup.
STRUCTURAL AND MULTIDISCIPLINARY OPTIMIZATION
(2022)
Article
Chemistry, Physical
Deli Zhang, Kai Wang, Xiaoping Wang
Summary: A method for designing variable stiffness laminates using the cubic Ferguson curve is proposed in this study to satisfy curvature limitations and enhance the buckling load. Numerical experiments show that the designed variable stiffness laminates exhibit better stability and higher buckling load compared to traditional constant stiffness laminates.
Article
Engineering, Multidisciplinary
Jose Humberto S. Almeida, Luc St-Pierre, Zhihua Wang, Marcelo L. Ribeiro, Volnei Tita, Sandro C. Amico, Saullo G. P. Castro
Summary: This work demonstrates the potential of manufacturing variable-angle composite cylinders using filament winding. The approach allows different filament angles along the axial direction by dividing the cylinder into regions of constant angle. The VAFW design shows significantly higher buckling strength, stiffness, and absorbed energy compared to the constant-angle configuration.
COMPOSITES PART B-ENGINEERING
(2021)
Article
Computer Science, Interdisciplinary Applications
Haoqing Ding, Bin Xu, Liang Song, Weibai Li, Xiaodong Huang
Summary: A new parameterized angle variable scheme (PAVS) is proposed in this study to conveniently represent continuous fiber paths, which can meet manufacturing constraints. Two buckling optimization frameworks for VS composites considering manufacturing constraints are then proposed.
ADVANCES IN ENGINEERING SOFTWARE
(2022)
Article
Engineering, Mechanical
Michele Iacopo Izzi, Marco Montemurro, Anita Catapano
Summary: The aim of this paper is to propose a deterministic optimization methodology for variable-stiffness composite (VSC) structures, considering different design requirements under multiple load cases. The first-level problem is addressed, where the design variables are the polar parameters (PPs) and the thickness of the VSC laminate. The goal is to minimize the mass of the VSC structure subject to feasibility, strength, buckling load, and curvature requirements. Additionally, a benchmark problem representative of a fuselage panel subjected to multiple loading conditions is proposed for assessing different design strategies.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Materials Science, Composites
Zhanghao Hou, Xiaoyong Tian, Junkang Zhang, Ziqi Zheng, Lu Zhe, Dichen Li, Andrei V. Malakhov, Alexander N. Polilov
Summary: The paper proposed an optimized design method based on stress gradient distribution for CFRCSs to improve strength efficiency of continuous fiber reinforced composites. By studying the mechanism of fiber content regulation and proposing an adaptive feed calculation method, 3D printing of CFRCSs was achieved, leading to a reduction in stress concentration factor and an increase in ultimate tensile strength. The optimized design approach aligns fiber distribution with stress distribution, while redistributing stress to reduce concentration, ultimately enhancing ultimate strength.
COMPOSITES SCIENCE AND TECHNOLOGY
(2021)
Article
Computer Science, Interdisciplinary Applications
Onur Coskun, Halit S. Turkmen
Summary: A novel framework is proposed to optimize variable stiffness (VS) composite circular cylinders using the direct fiber path parameterization technique and Bezier curves. The framework leverages prior knowledge of the design space and utilizes a non-dominated sorting genetic algorithm (NSGA-II) for optimization. The optimized VS composite shell shows a significant increase in buckling load compared to the reference quasi-isotropic composite cylindrical shell.
STRUCTURAL AND MULTIDISCIPLINARY OPTIMIZATION
(2023)
Article
Engineering, Manufacturing
Torkan Shafighfard, Thomas A. Cender, Eralp Demir
Summary: The methodology developed in this study allows for the design and manufacture of 3D printed short fiber-reinforced composite materials with optimized fiber or print directions. By locally steering the print paths to orient the fiber directions, the benefit of anisotropic fiber reinforcement can be optimized.
ADDITIVE MANUFACTURING
(2021)
Article
Mechanics
Yajun Cao, Huaiwei Huang
Summary: This paper proposes an isogeometric topology optimization method for the simultaneous optimization of fiber orientation and topology structure of variable stiffness composite laminate (VSCL) energy harvesters. Through verification and analysis, the optimization method is shown to improve energy harvesting efficiency.
COMPOSITE STRUCTURES
(2022)
Article
Engineering, Multidisciplinary
Chao Mei, Qifu Wang, Chen Yu, Zhaohui Xia
Summary: This paper introduces an effective fiber angle optimization method based on gradient, which synchronously optimizes fiber angles and densities for two and multi-layered composites to improve design efficiency. The method utilizes isogeometric analysis with non-uniform rational B-splines (NURBS) for structure response and sensitivity analysis, and generates smooth fiber paths using streamline method and partitioned selection process to alleviate fiber discontinuity phenomenon.
CMES-COMPUTER MODELING IN ENGINEERING & SCIENCES
(2021)
Article
Materials Science, Composites
Devesh Punera, Paulomi Mukherjee
Summary: This review presents the current research status of variable stiffness composites (VSC) and discusses various manufacturing techniques, constraints, and defects associated with VSC. It summarizes existing studies in the domain of buckling, vibration, and aeroelastic tailoring of angle tow composites, aiming to connect important aspects of analysis and provide a holistic approach for future studies.
JOURNAL OF REINFORCED PLASTICS AND COMPOSITES
(2022)
Article
Engineering, Aerospace
Ye Tian, Yuhang Huo, Tielin Shi, Qi Xia
Summary: This paper discusses the design optimization of variable stiffness composites with manufacturing constraints from automated fiber placement technology. Two filters are proposed to address the issue, which are integrated into an interpolation-based design optimization framework.
CHINESE JOURNAL OF AERONAUTICS
(2021)
Article
Mechanics
S. DorMohammadi, M. Rais-Rohani, M. Rouhi
COMPOSITE STRUCTURES
(2015)
Article
Engineering, Multidisciplinary
Mohammad Rouhi, Hossein Ghayoor, Suong V. Hoa, Mehdi Hojjati
COMPOSITES PART B-ENGINEERING
(2015)
Article
Materials Science, Composites
Mohammad Rouhi, Hossein Ghayoor, Suong V. Hoa, Mehdi Hojjati
SCIENCE AND ENGINEERING OF COMPOSITE MATERIALS
(2015)
Article
Mechanics
Mohammad Rouhi, Hossein Ghayoor, Suong V. Hoa, Mehdi Hojjati, Paul M. Weaver
COMPOSITE STRUCTURES
(2016)
Article
Mechanics
Hossein Ghayoor, Mohammad Rouhi, Suong V. Hoa, Mehdi Hojjati
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2017)
Article
Mechanics
Mohammad Rouhi, Hossein Ghayoor, Jeffrey Fortin-Simpson, Tom T. Zacchia, Suong V. Hoa, Mehdi Hojjati
COMPOSITE STRUCTURES
(2018)
Article
Mechanics
M. Rouhi, M. Rais-Rohani, A. Najafi
COMPOSITE STRUCTURES
(2013)
Article
Mechanics
M. Rouhi, M. Rais-Rohani
COMPOSITE STRUCTURES
(2013)
Article
Mechanics
Mohammad Rouhi, Hossein Ghayoor, Suong V. Hoa, Mehdi Hojjati
COMPOSITE STRUCTURES
(2014)
Article
Computer Science, Interdisciplinary Applications
Mohammad Rouhi, Masoud Rais-Rohani, Thomas N. Williams
STRUCTURAL AND MULTIDISCIPLINARY OPTIMIZATION
(2010)
Article
Engineering, Aerospace
Vincenzo Oliveri, Giovanni Zucco, Daniel Peeters, Gearoid Clancy, Robert Telford, Mohammad Rouhi, Ciaran McHale, Ronan M. O'Higgins, Trevor M. Young, Paul M. Weaver
Article
Engineering, Aerospace
G. Zucco, V Oliveri, M. Rouhi, R. Telford, G. Clancy, C. McHale, R. O'Higgins, T. M. Young, P. M. Weaver, D. Peeters
AERONAUTICAL JOURNAL
(2020)
Article
Mechanics
Shahrzad Daghighi, Mohammad Rouhi, Giovanni Zucco, Paul M. Weaver
COMPOSITE STRUCTURES
(2020)
Proceedings Paper
Engineering, Industrial
Saber DorMohammadi, Mohammad Rouhi, Masoud Rais-Rohani
PROCEEDINGS OF THE ASME INTERNATIONAL DESIGN ENGINEERING TECHNICAL CONFERENCES AND COMPUTERS AND INFORMATION IN ENGINEERING CONFERENCE 2012, VOL 3, PTS A AND B
(2012)
Article
Engineering, Civil
Jian Xue, Weiwei Zhang, Jing Wu, Chao Wang, Hongwei Ma
Summary: This study integrates a plate-type local resonator with varying free boundaries within a plate to convert the initial low-order global vibration modes into localized vibration modes. A novel semi-analytical method is proposed to analyze the free vibration of the plate with thickness and displacement discontinuities. The results show that by applying free boundary conditions, the low-order localized vibration frequencies can be significantly reduced without affecting the low-order global frequencies.
THIN-WALLED STRUCTURES
(2024)
Article
Engineering, Civil
Merve Tunay
Summary: In recent years, there has been an increasing number of studies on the mechanical properties of sandwich structures manufactured with the Fused Deposition Modeling (FDM) method. However, there is still a lack of experimental data on the mechanical characteristics of FDM-manufactured sandwich structures under different thermal aging durations. In this experiment, the energy absorption capabilities of sandwich structures with different core geometries were investigated under various thermal aging durations. The results showed that the core topology significantly influenced the energy absorption abilities of the sandwich structures.
THIN-WALLED STRUCTURES
(2024)
Article
Engineering, Civil
Zi-qin Jiang, Zi-yao Niu, Ai-Lin Zhang, Xue-chun Liu
Summary: This paper proposes a crosssection corrugated plate steel special-shaped column (CCSC) that improves the bearing capacity and overall stability of structural columns by using smaller material input. Through theoretical analysis and numerical simulation, the overall stability of the CCSC under axial compression is analyzed. The design method and suggestions for the stability of CCSC are put forward. Compared with conventional square steel tube columns, the CCSC has obvious advantages in overall stability and steel consumption.
THIN-WALLED STRUCTURES
(2024)
Article
Engineering, Civil
Yong Zhang, Yangang Chen, Jixiang Li, Jiacheng Wu, Liang Qian, Yuanqiang Tan, Kunyuan Li, Guoyao Zeng
Summary: A hybrid TPMS method was proposed to develop a new TPMS structure, and the mechanical properties of different TPMS structures were studied experimentally and numerically. Results showed that the hybrid TPMS structure had higher energy absorption and lower load-carrying capacity fluctuation. Further investigations revealed that the topological shape and material distribution had significant influence on mechanical properties, and the hybrid additive TPMS structure exhibited significant crashworthiness advantage in in-plane crushing condition.
THIN-WALLED STRUCTURES
(2024)
Article
Engineering, Civil
Tongfei Sun, Ye Liu, Kaoshan Dai, Alfredo Camara, Yujie Lu, Lijie Wang
Summary: This paper presents a series of experimental and numerical studies on the performance of a novel double-stage coupling damper (DSCD). The effects of damper configuration, friction-yield ratio (Rfy), and loading protocol on the hysteresis performance of the DSCD are investigated. The test results demonstrate that the arrangement of ribs in the DSCD increases its energy dissipation capacity. Numerical analysis reveals that the length of the friction mechanism and the clearance between the yield segment and the restraining system affect the energy dissipation and stability of the damper.
THIN-WALLED STRUCTURES
(2024)
Article
Engineering, Civil
Jeonghwa Lee, Young Jong Kang
Summary: This study investigates the local buckling behavior and strength of I-shape structural sections by considering flange-web interactions through three-dimensional finite element analysis. The study provides a more reasonable estimation of local buckling strength by considering the ratio of flange-web slenderness and height-to-width ratio, and presents design equations for flange local and web-bend buckling coefficients.
THIN-WALLED STRUCTURES
(2024)
Article
Engineering, Civil
Yizhe Chen, Wenfeng Xiang, Qingsong Zhang, Hui Wang, Lin Hua
Summary: This study investigates the surface modification of a nickel plate to improve the bonding strength with carbon fiber-reinforced plastics (CFRP). The results show that different surface modification methods, including sandblasting, coupling agent treatment, and compound coupling agent treatment, significantly enhance the bonding strength of CFRP/Ni joints. The research provides insights into improving the connection between nickel and CFRP, as well as other heterogeneous materials.
THIN-WALLED STRUCTURES
(2024)
Article
Engineering, Civil
Agha Intizar Mehdi, Fengping Zhang, Moon-Young Kim
Summary: A spatial stability theory of mono-symmetric thin-walled steel beams pre-stressed by spatially inclined cables is derived and its validity is demonstrated through numerical examples. The effects of initial tension, deviator numbers, inclined cable profiles, and bonded/un-bonded conditions on lateral-torsional buckling of the pre-stressed beams are investigated, with a specific emphasis on the effects of increasing initial tension.
THIN-WALLED STRUCTURES
(2024)
Article
Engineering, Civil
Teng Ma, Jinxiang Wang, Liangtao Liu, Heng Li, Kui Tang, Yangchen Gu, Yifan Zhang
Summary: The structural response of water-back plate under the combined action of shock wave and bubble loads at water depths of 1-300 m was numerically investigated using an arbitrary Lagrange-Euler method. The accuracy of the numerical model was validated by comparing with experimental and theoretical results. The influences of water depth and length-to-diameter ratio of the charge on the combined damage effect were analyzed. The results show that as water depth increases, the plastic deformation energy of the water-back plate decreases, and the permanent deformation mode changes from convex to concave. When the charge has a large length-to-diameter ratio, the plastic deformation energy of the radial plate is higher than that of the axial plate, and the difference decreases with increasing water depth. Increasing the length-to-diameter ratio enhances the combined damage effect in the radial direction in deep-water environments.
THIN-WALLED STRUCTURES
(2024)
Article
Engineering, Civil
Qiu-Yun Li, Ben Young
Summary: This paper investigates the flexural performance of CFS zed section members bent about the neutral axis parallel to the flanges through experimental and numerical analysis. The results show that the current direct strength method generally provides conservative predictions for the flexural strength of unstiffened zed section members, but slightly unconservative design for edge-stiffened zed section beams. The nominal flexural strengths of zed section members with edge stiffeners were found to be underestimated by 17% to 21% on average. Modified DSM formulae are recommended for the design of CFS zed section beams.
THIN-WALLED STRUCTURES
(2024)
Article
Engineering, Civil
Weinan Gao, Bo Song, Xueyan Chen, Guochang Lin, Huifeng Tan
Summary: This paper presents a precise method for predicting deformation in large-scale inflatable structures, utilizing finite element modeling and laser scanning technique. The study shows a good agreement between the predictive model and non-contact measurement results.
THIN-WALLED STRUCTURES
(2024)
Article
Engineering, Civil
Fei Gao, Zongyi Wang, Rui Zhu, Zhenming Chen, Quanxi Ye, Yaqi Duan, Yunlong Jia, Qin Zhang
Summary: This research investigates the mechanical properties of high-strength ring groove rivet assemblies and the load resistances of riveted T-stubs. Experimental tests reveal that Grade 10.9 rivets have higher yield strength and strain, and lower ultimate strain, making them suitable for high-strength ring groove rivet connections. Increasing the rivet diameter benefits the T-stubs, while increasing the flange thickness is not always advantageous. The Eurocode 3 method is not suitable for T-stubs connected through ring groove rivets, while the Demonceau method is conservative.
THIN-WALLED STRUCTURES
(2024)
Article
Engineering, Civil
Shangchun Jiang, Liangfeng Sun, Haifei Zhan, Zhuoqun Zheng, Xijian Peng, Chaofeng Lue
Summary: This study investigates the bending behavior of two-dimensional nanomaterials, diamane and its analogous structure TBGIB, through atomistic simulations. It reveals that diamane experiences structural failure under bending, while TBGIB bends elastically before undergoing structural failure. The study provides valuable insights for the application of these materials in flexible electronics.
THIN-WALLED STRUCTURES
(2024)
Article
Engineering, Civil
Qiang Zhang, Jianian Wen, Qiang Han, Hanqing Zhuge, Yulong Zhou
Summary: In this study, the mechanical properties of Q690 steel H-section columns under bi-directional cyclic loads are investigated, considering the time-varying characteristics of corrosion. A refined finite element (FE) model is built to analyze the degradation of mechanical property and failure mechanisms of steel columns with different design parameters during the whole life-cycle. The study proposes a quantitative calculation method for the ultimate resistance and damage index of steel columns, taking into account the ageing effects. The findings emphasize the importance of considering the ageing effects of steel columns in seismic design.
THIN-WALLED STRUCTURES
(2024)
Article
Engineering, Civil
Yuda Hu, Qi Zhou, Tao Yang
Summary: The magneto-thermo-elastic coupled free vibration of functionally graded materials cylindrical shell is investigated in this study. The vibration equation in multi-physical field is established and solved using the Hamilton principle and the multi-scale method. The numerical results show that the natural frequency is influenced by various factors such as volume fraction index, initial amplitude, temperature, and magnetic induction intensity.
THIN-WALLED STRUCTURES
(2024)