Article
Computer Science, Interdisciplinary Applications
Hosein Sangtarash, Hamed G. Arab, Mohammad R. Sohrabi, Mohammad R. Ghasemi
Summary: This paper introduces a new four-node quadrilateral flat shell element, QFSUQ, which is suitable for analysis of shell structures. The element combines a new membrane component and a plate-bending component, providing accurate and feasible results for complex geometry, loading, and boundary conditions in shell structures.
ENGINEERING WITH COMPUTERS
(2021)
Article
Engineering, Civil
Jie Zhou, Zhen Wu, Zhengliang Liu, Renbang Lin, Bin Ji, Lei Lei, Han Han
Summary: This paper proposes a new triangular composite shell element, which improves the accuracy of interlaminar stresses by enforcing continuity conditions of transverse shear stresses in advance. Several typical examples are analyzed and compared with other results, demonstrating the potential application value of the proposed shell element.
THIN-WALLED STRUCTURES
(2022)
Article
Computer Science, Interdisciplinary Applications
Jianghuai Li, Zihua Zhang, Lei Liu
Summary: This paper introduces new variable-order shell elements that only require the discretization of the shell mid-surface, utilize the assumed natural strain method to eliminate locking effects, and demonstrate superior performance in terms of applicability, accuracy, and efficiency.
COMPUTERS & STRUCTURES
(2022)
Article
Engineering, Civil
Jianghuai Li
Summary: This study proposes new finite element methods for functionally graded piezoelectric shells that can accurately, efficiently, and comprehensively describe such structures. The shell element is treated as a three-dimensional continuum and its middle surface is represented with a quadrilateral spectral element. The shell geometry is described by scaling the middle surface along the thickness, while the displacements and electric potential are approximated using consistent quadratic Lagrange interpolation. The developed approach is verified by solving piezoelectric or functionally graded plate problems with reference solutions. The influence of power-law index and span-to-thickness ratio on the static and free vibration behaviors of the functionally graded structures is investigated and the optimal value of lambda for general functionally graded shells is determined.
THIN-WALLED STRUCTURES
(2023)
Article
Computer Science, Interdisciplinary Applications
Mina Kohansal Vajargah, Reza Ansari
Summary: This paper presents a numerical analysis of the free vibration of micromorphic structures under various boundary conditions. The study focuses on the size effects on the vibrational behavior of micro-structures using a micromorphic formulation and micromorphic elements.
ENGINEERING COMPUTATIONS
(2022)
Article
Mechanics
Minh-Chien Trinh, Hyungmin Jun
Summary: This paper introduces a geometrically nonlinear formulation for a nine-node shell finite element, utilizing total Lagrangian formulation and MITC technique to reduce membrane and shear locking phenomena. By using many-core accelerators with GPU-compatible libraries, the highest speed-up for the solution process is achieved. The present nine-node shell element shows excellent performance even with coarse mesh.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2021)
Article
Engineering, Civil
Thanh Chau-Dinh
Summary: An enhanced 3-node triangular flat shell element, named CS-MITC18+, is proposed in this paper, and its outstanding performance is demonstrated through static and free vibration analyses. The element exhibits spatial isotropy and zero-energy mode properties, and shows competitive accuracy, convergence, and computational cost compared to other conventional and strain-smoothed 3-node triangular flat shell elements.
THIN-WALLED STRUCTURES
(2023)
Article
Mechanics
Jianghuai Li, Zihua Zhang, Zhenwen Zhang
Summary: This paper presents new shell elements for the analysis of functionally graded plates and shells with varying material properties through the thickness. The shell element is treated as a three-dimensional linear elastic body and its middle surface is represented with a quadrilateral spectral element. The shell geometry is described by scaling the middle surface and the displacements are approximated using quadratic Lagrange shape functions. The developed shell elements eliminate various locking phenomena and require only the shell mid surface to be discretized. The formulation is validated through benchmark examples and gravity load problems.
COMPOSITE STRUCTURES
(2022)
Article
Mathematics, Applied
Yanhui Zhou, Jiming Wu
Summary: This paper introduces a new method that utilizes a bubble function for postprocessing to obtain a finite volume element solution that converges to the analytic solution in the two-dimensional anisotropic diffusion problem.
APPLIED MATHEMATICS LETTERS
(2022)
Article
Engineering, Multidisciplinary
Petr Krysl
Summary: This paper introduces a new flat facet finite element method for linear static and dynamic analysis of thick and thin shells. The method effectively handles drilling rotations and demonstrates robustness for extremely thin shells through testing.
INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING
(2022)
Article
Construction & Building Technology
Zhen Wang, Yang Zhao, Zhi Ding, Huiping Tang
Summary: Based on the linear superposition of the quadrilateral isoparametric membrane element and quadrilateral Mindlin plate element, this study derives basic vector formulas for the quadrilateral isoparametric shell element with shear deformation and proposes two different coordinate modes to update particle displacement and element node internal force. The uniform numerical solution for an irregular quadrilateral element is achieved using isoparametric integral scheme, while the bilinear elastoplastic constitutive of material and nonlinear effect are introduced based on the integral method along the thickness. The developed nonlinear calculation and analysis program for the quadrilateral isoparametric shell element is validated through numerical example results.
ADVANCES IN CIVIL ENGINEERING
(2022)
Article
Computer Science, Interdisciplinary Applications
Xiangyang Cui, Gongcheng Peng, Qi Ran, Huan Zhang, She Li
Summary: A novel degenerated shell element called MITC4+R is developed, which eliminates various locking problems common to shell elements and significantly improves the computational efficiency. It is based on assumed natural strain method and introduces a physical stabilization term.
COMPUTERS & STRUCTURES
(2024)
Article
Mathematics, Applied
J. Querales, P. Venegas
Summary: This paper studies the numerical approximation of mixed formulations for the acoustic eigenvalue problem with axial symmetry and introduces two mixed formulations to avoid spurious modes. The proposed method based on the Raviart-Thomas mixed method is analyzed and shown to have convergence and quasi-optimal order error estimates, which are supported by numerical results.
COMPUTERS & MATHEMATICS WITH APPLICATIONS
(2022)
Article
Mathematics, Applied
Y. Liang, B. A. Izzuddin
Summary: This paper presents a family of 6-noded Reissner-Mindlin triangular shell elements based on the hierarchic optimisation approach, which can effectively alleviate inaccuracies arising from locking and embrace the desirable characteristics of spatial isotropy and insensitivity to element distortion.
FINITE ELEMENTS IN ANALYSIS AND DESIGN
(2022)
Article
Mathematics, Applied
Jose Querales, Rodolfo Rodriguez, Pablo Venegas
Summary: This paper focuses on the numerical approximation of the displacement formulation of the acoustic eigenvalue problem in the axisymmetric case. It is shown that using lowest order triangular Raviart-Thomas elements may lead to spurious eigenvalues, but an alternative weak formulation is proposed to avoid this issue. A finite element discretization based on the same elements achieves quasi-optimal order spectral convergence and eliminates spurious modes, as supported by numerical experiments.
SIAM JOURNAL ON SCIENTIFIC COMPUTING
(2021)
Article
Acoustics
Hasan Koruk, Muzaffer Serenli, Kenan Y. Sanliturk
Article
Acoustics
Niloufar Saharkhiz, Hasan Koruk, James J. Choi
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
(2018)
Article
Engineering, Mechanical
Hasan Koruk, Kenan Y. Sanliturk
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2019)
Article
Acoustics
Ahmed El Ghamrawy, Florentina de Comtes, Hasan Koruk, Ali Mohammed, Julian R. Jones, James J. Choi
ULTRASOUND IN MEDICINE AND BIOLOGY
(2019)
Article
Acoustics
Hasan Koruk, James J. Choi
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
(2019)
Article
Acoustics
Mehmet Sait Ozer, Hasan Koruk, Kenan Yuce Sanliturk
JOURNAL OF SOUND AND VIBRATION
(2019)
Article
Materials Science, Textiles
Yusuf Saygili, Garip Genc, Kenan Y. Sanliturk, Hasan Koruk
Summary: This study investigates the acoustic and mechanical properties of homogeneous and hybrid jute and luffa biocomposites. By designing and manufacturing composite materials, the elasticity moduli are determined using experimental and theoretical models. The results show that the hybrid composites have good acoustic absorption and damping properties.
JOURNAL OF NATURAL FIBERS
(2022)
Article
Mechanics
Mehmet Sait Ozer, Hasan Koruk, Kenan Y. Sanliturk
COMPOSITE STRUCTURES
(2020)
Article
Materials Science, Textiles
Hasan Koruk, Ahmet Cihan Ozcan, Garip Genc, Kenan Y. Sanliturk
Summary: This study investigates the acoustic properties of natural fiber-reinforced composites, specifically focusing on the effects of sample thickness and fiber/resin ratio on the sound absorption coefficients (SACs) and transmission losses (TLs) of jute and luffa fiber-reinforced biocomposites. The study also predicts the acoustic properties of natural fiber-based samples with different thicknesses using mathematical models and compares the theoretical and experimental results.
JOURNAL OF NATURAL FIBERS
(2022)
Review
Materials Science, Textiles
Hasan Koruk
Summary: This paper critically evaluates the acoustic properties of natural fiber samples, including measurement and prediction methods, common techniques for sound absorption coefficients and sound transmission losses, models for prediction, and empirical models for estimating sound absorption coefficients. It presents the evaluation of sound absorption performance based on thickness and bulk density, as well as the presentation of sound transmission losses for porous natural fiber samples.
JOURNAL OF NATURAL FIBERS
(2022)
Article
Education, Scientific Disciplines
H. Koruk
Summary: An analytical model for predicting the dynamic behavior of spheres at medium interfaces has been developed, with an improved model developed through the comparison of mathematical and finite element models. The model, which considers elastic properties, sphere size, medium density, sphere mass, and radiation damping, is applicable to small and large sphere displacements. This model provides insight into the dynamic responses of spherical objects at medium interfaces and can be a valuable tool for students and researchers in engineering, materials science, and physics.
EUROPEAN JOURNAL OF PHYSICS
(2021)
Article
Education, Scientific Disciplines
H. Koruk
Summary: This study comprehensively investigates the static and dynamic responses of a sphere located at elastic and viscoelastic medium interfaces. Mathematical models for predicting the static displacement of a sphere at an elastic interface are compared, and an accurate mathematical model for the static displacement of a sphere at an elastic interface is proposed. An improved mathematical model for the dynamic response of a sphere at a viscoelastic interface is developed, considering various factors such as Young's modulus, density, viscosity, and radiation damping. The model provides insights into the dynamic responses of spheres at viscoelastic interfaces, and is a valuable tool for researchers in engineering, materials science, and physics.
EUROPEAN JOURNAL OF PHYSICS
(2022)
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)
