Article
Materials Science, Multidisciplinary
Liu Jiao-Wang, Jose Antonio Loya, Carlos Santiuste
Summary: This work aims to analyze the influence of the cross-section shape of a fully biodegradable composite bumper beam. Flax/PLA bumper beams with four different degrees of roundness were manufactured. Specimens were subjected to low velocity impacts and the post-impact behavior was evaluated through three-point bending tests. The results indicate that different cross-section shapes can be selected depending on whether the objective is to maximize impact performance or post-impact residual properties.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2023)
Article
Automation & Control Systems
Jiaxin Gao, Zhongyi Cai, Xi Zhang, Mingwei Wang, Weiguang Zhang, Qingmin Chen
Summary: Continuous roll forming (CRF) is a powerful process for manufacturing 3D surfaces using bendable rolls. This paper presents an effective method for predicting the shape of doubly curved sheet metal in CRF by separately tackling the curvatures caused by plastic and elastic deformation. The method is validated through finite element simulations and forming experiments, showing close agreement between theoretical calculations and experimental results.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2023)
Article
Automation & Control Systems
Heng-yi Yuan, Yi Li
Summary: A new process based on continuous cold rolling with curved rigid roll is proposed for rapid forming of three-dimensional surfaces. The process utilizes the shape of the rolls to cause transversal bending deformation of the metal plate and uneven thinning through a symmetry uneven roll gap, resulting in the formation of three-dimensional surfaces. The feasibility and effectiveness of the curved rigid roll rolling process for three-dimensional surface forming are demonstrated through numerical simulations of convex and saddle surfaces.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2021)
Article
Mechanics
Genda Wang, Jiefu Liu, Zhaijun Lu
Summary: This study investigates the impact resistance of sandwich panels with different honeycomb configurations. The results show that flat panels perform better than curved panels at low impact velocities, and a small radius of curvature should be avoided to enhance impact resistance. Under high-velocity impact, panels with concentric honeycombs show improved resistance compared to those with coaxial honeycombs. However, the influence of honeycomb configurations decreases as the curvature radius increases.
COMPOSITE STRUCTURES
(2022)
Article
Materials Science, Composites
Wei-Tsen Lu, Endel Iarve, Yu-Jui Liang
Summary: In this paper, a closed-form analytical solution is developed for analyzing laminated composite curved beam with out-of-plane fiber waviness under bending. Timoshenko beam theory is adopted in derivation, considering the effects of shear deformation for moderately thick beam. Explicit expressions for evaluating equivalent axial and bending stiffness are formulated based on the modified lamination theory and taking the structural deformation characteristics of narrow section beam into consideration. The proposed method can capture radial normal, circumferential normal, and shear stress distributions of composite curved beam with out-of-plane fiber waviness, and the level of stress predicted is satisfactory with numerical results.
JOURNAL OF COMPOSITE MATERIALS
(2023)
Article
Engineering, Civil
Wenbin Hou, Mengdi Li, Xin Zhang, Zhifeng Liu, Lin Sang
Summary: This study investigates the design and optimization of a bumper beam made of fiber metal laminates (FMLs) corrugated sandwich structure under low-velocity impact. The FMLs bumper beam exhibits good impact resistance performance, making it an excellent choice for automobile bumpers.
THIN-WALLED STRUCTURES
(2023)
Article
Engineering, Manufacturing
Ismail Ozturk
Summary: The crashworthiness performance of different sheet metal beams in terms of specific energy absorption and peak crushing force was compared in this study. It was found that a specific combination of materials resulted in better crashworthiness performance and could be used in the design of vehicle front bumper beams to improve passenger safety.
INTERNATIONAL JOURNAL OF CRASHWORTHINESS
(2022)
Article
Materials Science, Multidisciplinary
Toyohisa Shinmiya, Yuji Yamasaki, Hiroto Miyake, Jiro Hiramoto
Summary: Dimensional accuracy defects caused by springback behavior are a serious issue in press forming for automobile parts. This study investigates a new press-forming method to suppress camber back and develops a forming method to prevent buckling under high compression conditions.
MATERIALS TRANSACTIONS
(2022)
Article
Engineering, Civil
Jianxun Zhang, Hui Yuan, Jianfeng Li, Jixing Meng, Wei Huang
Summary: This paper investigates the dynamic response of multilayer curved aluminum honeycomb sandwich beams under low-velocity impact. The deformation process and final failure modes are observed and analyzed. Numerical calculations are performed and show good agreement with experimental results. The effects of core thickness, core-thickness gradient, and gradient of inscribed circle diameters on the load-carrying capacity and energy absorption of multilayer curved aluminum honeycomb sandwich beams are explored. The results suggest that adjusting the core thickness and curvature angle can effectively improve the energy absorption capacity and mitigation ability.
THIN-WALLED STRUCTURES
(2022)
Article
Engineering, Mechanical
Carsten Broese, Stergios-Alexandros Sideris, Charalampos Tsakmakis, Oezer Uengoer
Summary: Existing Euler-Bernoulli beam theories in classical elastostatics suffer from inconsistency. However, it has been shown that by introducing elastic anisotropy and internal constraints, the theory can be made consistent. This paper derives two known one-dimensional formulations for Euler-Bernoulli beam and gradient elastic material behavior as special cases of a three-dimensional simple gradient elasticity model and proves their equivalence.
JOURNAL OF ENGINEERING MECHANICS
(2023)
Article
Biochemistry & Molecular Biology
Somnath Basak, Uday S. Annapure
Summary: Cold plasma technology is environmentally friendly and can improve the functional properties of hydrocolloids. This study investigated the impact of cold plasma treatment on the rheology and barrier properties of pectin films. The results showed that plasma-treated pectin had improved film-forming properties and lower oxygen and carbon dioxide transmission rates.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2023)
Article
Construction & Building Technology
Youbao Jiang, Yi Tian, Hao Zhou, Guangyu Tan, Jiye Xiong, Yan Zhou
Summary: This article proposes a method for calculating the internal forces of curved beams, and a simplified approach is developed to simplify the calculation process. The effectiveness of the proposed methods is verified by three engineering examples.
STRUCTURAL ENGINEERING INTERNATIONAL
(2023)
Article
Mechanics
M. Lezgy-Nazargah, E. Etemadi, S. R. Hosseinian
Summary: This paper investigates the accuracy of the four-variable refined global-local shear deformation theory in predicting the dynamic responses of curved sandwich beams under low-velocity impact. The theory is validated using a finite element model and the truncated superimposition of modes approach. The results show that the theory is accurate and computationally efficient for solving dynamic problems.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2022)
Article
Materials Science, Multidisciplinary
Nima Shahveisi, Saeed Feli
Summary: This article investigates the dynamic response of a curved Fiber-Metal-Laminate sandwich beam with a flexible core under low-velocity impact on the top face sheet. Higher order shear deformation theory and strain-displacement, stress-strain equations are applied to obtain the displacement field of the core and the results are compared with simulations and previous research. The effects of beam curvature angle, core thickness and modulus of elasticity, and impactor mass and velocity on radial displacements and contact force histories are reviewed.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2022)
Article
Chemistry, Multidisciplinary
Ting Xu, Ruichen Yi, Chunqin Zhu, Mingquan Lin
Summary: This study successfully developed a simplified R/G/B OLED structure with unique design philosophy and specific luminescent dyes, meeting the requirements of indoor lighting with low efficiency roll-off and low threshold voltage.
FRONTIERS IN CHEMISTRY
(2021)