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
Engineering, Civil
M. V. V. S. Murthy, S. Gopalakrishnan, D. Poomani
Summary: A new two-node spectral finite element is proposed to study face sheet-core disbond in a sandwich panel. The numerical results obtained using this element are validated by comparing with commercially available finite element software simulations. The study on wave propagation characteristics and the effect of core damping on waves propagating in the panel are discussed.
THIN-WALLED STRUCTURES
(2022)
Article
Materials Science, Multidisciplinary
Shirsendu Sikdar, Shishir Kumar Singh, Pawel Malinowski, Wieslaw Ostachowicz
Summary: A novel electromechanical impedance-based SHM approach is proposed for localizing skin-core debonds in composite sandwich structures. Experimental and numerical studies show that interfacial debonds significantly affect conductance magnitudes of EMI signals in CSS, with magnitude dependence on debond-PZT distances. A simulated SHM approach using a debond detection algorithm effectively locates such debonds, with potential for detecting debonds at different locations in CSS.
JOURNAL OF INTELLIGENT MATERIAL SYSTEMS AND STRUCTURES
(2022)
Article
Engineering, Aerospace
Jinghui Deng, Tangzhen Wu, Zhen Wu, Zhengliang Liu, Xiaohui Ren
Summary: This paper proposes a higher-order model for dynamic analysis, which can accurately predict the natural frequencies corresponding to higher-order displacement modes.
CHINESE JOURNAL OF AERONAUTICS
(2023)
Article
Materials Science, Composites
Lihua Yuan, Sen Liang
Summary: The study investigates the free vibration behaviors of the embedded and co-cured perforated damping sandwich composite (ECPDSC) filled with resin. Theoretical exploration and experimental verification reveal the relationships between damping area ratio, thickness of damping layer, and elastic modulus with the dynamic properties of ECPDSC. The results show that modal frequency decreases slowly for small damping area ratios, decreases rapidly for large damping area ratios, and the trend of loss factor is opposite.
JOURNAL OF COMPOSITE MATERIALS
(2021)
Article
Mechanics
Lanxiang Liu, Wenying Yang, Yuyang Chai, Guofu Zhai
Summary: This study presents a simple and effective method to investigate the vibration and thermal buckling behaviors of different multi-span sandwich beams with pyramidal truss core. Parametrical investigations and discussions are conducted regarding the ply angle of the composite laminated face sheets and the radius of trusses, as well as the influences of the span number and subspan length on the vibration and thermal buckling behaviors of composite lattice sandwich beams.
ARCHIVE OF APPLIED MECHANICS
(2021)
Article
Engineering, Multidisciplinary
Weimin Jiang, Junmeng Zhou, Jiayi Liu, Mangong Zhang, Wei Huang
Summary: In this study, the free vibration behaviors of carbon fiber composite sandwich plates with reentrant honeycomb cores were investigated using experiment, theory, and finite element method. The composite sandwich plates were designed and fabricated, and their modal characteristics were tested under simply supported boundary conditions. The effects of relative densities and dimensions on the natural frequencies were analyzed. The theoretical results were compared with experimental and finite element calculation results, showing good accuracy of the theory and FEM in predicting the natural frequencies.
APPLIED MATHEMATICAL MODELLING
(2023)
Article
Materials Science, Multidisciplinary
P. Senthilkumaran, R. Venkatachalam, K. Venkatesh Raja
Summary: The research focuses on the dynamic characteristics of a multi-core sandwich composite beam with cutouts. Square cutouts exhibit the highest damping capability, and their geometric position significantly affects frequency levels. Introduction of cutouts reduces frequency levels, while secondary investigation of multicore reinforced sandwich beams experiences a maximum reduction in frequency of about 15%.
MATERIALS RESEARCH EXPRESS
(2021)
Article
Engineering, Civil
Suryamani Behera, Deepti Ranjan Mohapatra, Subhajit Mondal
Summary: Sandwich composite structures can exhibit significant variation in their dynamic behavior due to uncertainties in the manufacturing processes, material properties, and geometry. This study focuses on quantifying and modeling the variability in the dynamic behavior of a glass-fiber reinforced plastic sandwich composite plate through free vibration analysis. The uncertainty of the natural frequencies is quantified using Kolmogorov-Smirnov and Anderson-Darling goodness-of-fit tests, and an appropriate probabilistic distribution is recommended to describe the variability of the vibrational response.
INTERNATIONAL JOURNAL OF STRUCTURAL STABILITY AND DYNAMICS
(2023)
Article
Mechanics
Yanchun Zhai, Jiaxing Ma, Sen Liang
Summary: The dynamics properties of two kinds of multi-layered composite sandwich doubly-curved shells with two-layered viscoelastic cores are studied based on first order shear deformation theory. The equations of motion governing the free vibrations are deduced using Hamilton's principle, and the vibration frequencies and loss factors are obtained by solving these equations as an eigenvalue problem. New results for dynamics properties are proposed for the first time, with the change rules of frequencies and loss factors with structural parameters evaluated and presented graphically.
COMPOSITE STRUCTURES
(2021)
Article
Engineering, Aerospace
Siddarth Niranjan Babu, George A. Kardomateas
Summary: This paper uses the elastic foundation approach and the Timoshenko beam theory to derive closed-form expressions for the energy release rate and mode partitioning of face/core debonds in the single-cantilever-beam sandwich composite configuration. The results are compared with finite element analysis and show good agreement.
Article
Acoustics
Mehdi Gholizadeh Eratbeni, Yasser Rostamiyan
Summary: The vibration properties of CFRP and GFRP composite sandwich panels with lozenge-like core were experimentally determined. Modal experiments and finite element simulations were used to obtain the modal properties of the structure and compare the vibration characteristics of the two types of sandwich panels.
JOURNAL OF VIBRATION AND CONTROL
(2022)
Article
Construction & Building Technology
Dillon Betts, Pedram Sadeghian, Amir Fam
Summary: This study experimentally investigated the post-impact residual flexural behavior of sandwich panels with flax fiber-reinforced polymer faces and polyisocyanurate foam cores. Results showed that the panels demonstrated remarkable resilience with no negative impacts on their flexural strength or stiffness after multiple impacts. The panels are suitable for infrastructure applications due to their ability to retain strength and stiffness even after impact events.
JOURNAL OF BUILDING ENGINEERING
(2021)
Article
Engineering, Mechanical
George A. Kardomateas, Zhangxian Yuan
Summary: This paper aims to derive closed form expressions for the energy release rate and mode partitioning of face/core debonds for Single Cantilever Beam Sandwich Composite testing configuration, using an elastic foundation approach and AJ-integral method. The results show good agreement with finite element analysis.
JOURNAL OF SANDWICH STRUCTURES & MATERIALS
(2021)
Article
Mechanics
Rajeshkumar Selvaraj, Apichit Maneengam, M. Sathiyamoorthy
Summary: This article investigates the material, mechanical and dynamic characteristics of natural fiber reinforced composite sandwich plates with multiple-core layers. Various material characterization techniques were used to study the properties of untreated and treated jute fiber materials. The developed model shows that the multiple-core natural composite sandwich plate significantly affects the structural stiffness, and the dynamic properties are influenced by various factors.
COMPOSITE STRUCTURES
(2022)
Article
Materials Science, Composites
Buket Okutan Baba, Ugur Ozmen
POLYMER COMPOSITES
(2017)
Article
Thermodynamics
Ugur Ozmen, Buket Okutan Baba
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2017)
Article
Mechanics
Melis Yurddaskal, Ugur Ozmen, Mehmet Kir, Buket Okutan Baba
COMPOSITE STRUCTURES
(2018)
Article
Materials Science, Composites
Ugur Kemiklioglu, Buket Okutan Baba
POLYMER COMPOSITES
(2019)
Article
Materials Science, Multidisciplinary
B. O. Baba, S. Thoppul, R. F. Gibson
EXPERIMENTAL MECHANICS
(2011)
Article
Engineering, Mechanical
Buket Okutan Baba
JOURNAL OF SANDWICH STRUCTURES & MATERIALS
(2013)
Article
Materials Science, Multidisciplinary
Ugur Kemiklioglu, Buket Okutan Baba
MATERIALS RESEARCH EXPRESS
(2019)
Article
Engineering, Multidisciplinary
Ugur Kemiklioglu, Buket Okutan Baba
COMPOSITES PART B-ENGINEERING
(2019)
Article
Polymer Science
Tarkan Akderya, Ugur Ozmen, Buket Okutan Baba
JOURNAL OF POLYMER RESEARCH
(2020)
Article
Materials Science, Textiles
Tarkan Akderya, Ugur Ozmen, Buket Okutan Baba
Summary: This study investigates the mechanical properties of pure PLA and CFF/PLA biocomposites subjected to long-term ageing, showing a decrease in mechanical properties with an increase in mass concentrations of CFF. The results indicate that higher mass concentrations of CFF in the biocomposite materials result in lower mechanical properties due to the long-term ageing effect.
FIBERS AND POLYMERS
(2021)
Article
Engineering, Chemical
Ugur Kemiklioglu, Buket Okutan Baba
Summary: This study investigates the mechanical behaviors of adhesively bonded composite joints through different mechanical tests. The results show that the strength of these joints decreases with increasing axial impact energy and vibration cycles, with a higher strength observed at 10 J energy compared to other impact energy values.
JOURNAL OF ADHESION SCIENCE AND TECHNOLOGY
(2023)
Article
Metallurgy & Metallurgical Engineering
Tarkan Akderya, Ugur Ozmen, Buket Okutan Baba
Summary: The modulus of elasticity is a critical parameter for the performance design and analysis of biofibre-based biocomposite materials. It is difficult to predict the modulus of elasticity due to factors such as internal heterogeneity and interfacial adhesion. This study aims to determine the modulus of elasticity of biocomposite materials reinforced with discontinuous and random fibres using micromechanical models and experiments, and to compare the reliability of different models in predicting the modulus of elasticity for aged and non-aged materials.
INTERNATIONAL JOURNAL OF MATERIALS RESEARCH
(2022)
Article
Engineering, Multidisciplinary
Dilek Atilla Yolcu, Buket Okutan Baba
Summary: Increasing performance demands in new technology applications have led to the search for new materials, with a focus on auxetic materials with negative Poisson's ratios. However, uncertainties arise in determining the Poisson's ratio of these materials due to their cellular structure and lack of standardized measurement methods. Experimental measurements for auxetic structures have also been limited in the literature. This study systematically examines the effect of different measurement regions and target points on the Poisson's ratios of auxetic structures, providing valuable insights for future research.
Article
Mechanics
Buket Okutan Baba
COMPOSITE STRUCTURES
(2017)
