Article
Mechanics
Ankita Gupta, S. Pradyumna
Summary: A finite element formulation is developed for linear and nonlinear static analyses of variable stiffness composite laminated shell panels using the third-order shear deformation theory with the Murakami zig-zag function. The accuracy of the formulation is established by comparing the results with existing literature, presenting new results for nonlinear deflection and stresses. The effects of fiber path angles, curvature ratios, number of layers, lamination configurations, and boundary conditions on the nonlinear static behavior of VSCL shells are investigated.
COMPOSITE STRUCTURES
(2021)
Article
Mechanics
Onur Coskun, Halit S. Turkmen
Summary: This paper proposes intuitive fiber path definition methods using Bezier curves for variable stiffness laminates, and compares the optimization results of different curve types for fiber paths in terms of buckling load and stiffness. The study indicates a significant impact of using different curves as fiber paths on the performance of laminates.
COMPOSITE STRUCTURES
(2022)
Article
Mechanics
Mengzhen Li, Renjun Yan, Lin Xu, C. Guedes Soares
Summary: A novel unified framework of higher-order shear deformation theories for laminated and functionally graded plates is developed, aiming to unify existing theories and propose new models. By categorizing existing displacement fields and unifying different types of transverse displacements and shear strains, the study assesses and proposes new plate theories. Application of specific shear strain functions helps determine a new higher-order shear deformation theory that theoretically covers existing models and encourages further exploration of accurate plate theories.
COMPOSITE STRUCTURES
(2021)
Article
Mechanics
L. Wang, Y. H. Li, Q. Xu, X. Zhao
Summary: The paper investigates the buckling response of a variable-length laminated beam constrained by a pair of symmetrical walls in a hygrothermal environment. The constrained wall, which is rigid, is supported by springs that move upwards as a whole after a force is applied. To establish the nonlinearly constrained buckling governing equation for the variable-length laminated beam, the principle of minimum potential energy and the Lagrange multiplier method are employed. The buckling responses of the beam are derived using the elliptic integral method, and extensive numerical calculations are conducted to analyze the effects of various parameters.
INTERNATIONAL JOURNAL OF NON-LINEAR MECHANICS
(2023)
Article
Mechanics
Xuan-Bach Bui, Trung-Kien Nguyen, Ngoc-Duong Nguyen, Thuc P. Vo
Summary: A general higher-order shear deformation theory for buckling and free vibration analysis of laminated thin-walled composite I-beams is proposed. Numerical examples are performed to investigate the effects of various factors on the critical buckling loads and natural frequencies of the beams.
COMPOSITE STRUCTURES
(2022)
Article
Engineering, Civil
Y. Z. Yuksel, S. D. Akbas
Summary: This paper presents the stress analysis of a composite laminated simply supported plate with porosity under hygrothermal rising. The Navier method is implemented for simply supported laminated composite plate with three different porosity distributions. The numerical results show that the hygrothermal condition is very effective in the stress behavior of laminated plates.
STRUCTURAL ENGINEERING AND MECHANICS
(2021)
Article
Engineering, Mechanical
Philip Schreiber, Christian Mittelstedt
Summary: The aim of this study is to improve the stability analysis method of unsymmetric laminated structures. By using discrete plate theory, the problem is simplified to a single plate. Explicit solutions for the buckling load are provided for unsymmetric laminates with different boundary conditions, and the results are compared with finite element analysis, showing good agreement.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2022)
Article
Materials Science, Composites
Ananda Babu Arumugam, Chandole Onkar Rajendra, P. Edwin Sudhagar, Vasudevan Rajamohan, Surajkumar G. Kumbhar, Anbumani Perumal
Summary: This study focuses on the numerical modeling and experimental validation of the thermal buckling behavior of tapered laminated composite beams, investigating the influence of structural and geometrical parameters on the beams through parametric study.
POLYMER COMPOSITES
(2022)
Article
Mechanics
Babu Ranjan Thakur, Surendra Verma, B. N. Singh, D. K. Maiti
Summary: This paper investigates the effect of hygrothermal environment on dynamic analysis of folded laminated composite plates using nonpolynomial shear deformation theory and computationally efficient finite element method. Various analyses such as natural frequency, transient behavior, and steady-state response are conducted under different conditions, with displacement and stress plots provided. The model is compared and validated with existing literature and ANSYS APDL solutions, showing better performance for NPSDT.
COMPOSITE STRUCTURES
(2021)
Article
Engineering, Civil
Nitin Sharma, Subham Mohapatra, Erukala Kalyan Kumar, Subrata Kumar Panda
Summary: This research investigates the flutter behavior of a layered structure using curved fibers instead of conventional fiber directions. The study finds that the variable stiffness of the laminated structure is influenced by the change in fiber directions. Numerical calculations using an in-house MATLAB code and isoparametric finite element formulation are used to compute the effective properties of the composite and the aeroelastic loading under supersonic flow. The model's accuracy is validated through comparison and convergence tests, and the influential parameters with and without fiber directional effects are analyzed in detail.
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, Civil
A. Milazzo, V. Oliveri
Summary: A new modeling approach for the buckling behavior of variable stiffness composite plates is proposed, and extensive studies are conducted on homogeneous and layered composite plates. The presence of cracks strongly influences the buckling behavior of the plates, and selecting appropriate fiber paths can enhance the performance.
THIN-WALLED STRUCTURES
(2021)
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
Thermodynamics
Jie Zheng, Chunwei Zhang, Farayi Musharavati, Afrasyab Khan, Tamer A. Sebaey
Summary: This study investigates the thermo-mechanical buckling responses of a sandwich microplate with Graphene nanoplatelets and single-walled carbon nanotubes reinforcement, exploring the effects of dispersion patterns on buckling behavior and temperature variations. The results may contribute to the development of more efficient engineering smart structures like micro/nanoelectromechanical systems.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Mechanics
Hao Liu, Yegao Qu, Fangtao Xie, Guang Meng
Summary: This paper develops a numerical model for analyzing nonlinear fluid-structure interaction problems of large-deformable composite laminated plates. A higher-order shear deformation zig-zag theory and nonlinear von K' arm'an strains are employed to consider the large deformations of variable stiffness composite laminated plates. The validity of the proposed model and method is confirmed by comparing the computed results with existing solutions. The effects of material properties and fiber paths on oscillation and wake-flow vortices are examined.
COMPOSITE STRUCTURES
(2023)
Article
Engineering, Multidisciplinary
Pramod Y. Kumbhar, A. Francis, N. Swaminathan, R. K. Annabattula, S. Natarajan
INTERNATIONAL JOURNAL OF COMPUTATIONAL METHODS
(2020)
Article
Computer Science, Software Engineering
Sundararajan Natarajan
COMPUTER AIDED GEOMETRIC DESIGN
(2020)
Article
Mathematics, Applied
D. Adak, S. Natarajan
COMPUTERS & MATHEMATICS WITH APPLICATIONS
(2020)
Article
Computer Science, Interdisciplinary Applications
Sundararajan Natarajan, Prasad Dharmadhikari, Ratna Kumar Annabattula, Junqi Zhang, Ean Tat Ooi, Chongmin Song
COMPUTERS & STRUCTURES
(2020)
Article
Materials Science, Multidisciplinary
R. Shyamkumar, K. V. Mohankumar, K. Kannan, S. Natarajan
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2020)
Article
Mathematics, Interdisciplinary Applications
Qingyuan Hu, Yang Xia, Sundararajan Natarajan, Andreas Zilian, Ping Hu, Stephane P. A. Bordas
COMPUTATIONAL MECHANICS
(2020)
Article
Mathematics, Interdisciplinary Applications
E. T. Ooi, A. Saputra, S. Natarajan, E. H. Ooi, C. Song
COMPUTATIONAL MECHANICS
(2020)
Article
Engineering, Multidisciplinary
Dibyendu Adak, A. L. N. Pramod, Ean Tat Ooi, Sundararajan Natarajan
ENGINEERING ANALYSIS WITH BOUNDARY ELEMENTS
(2020)
Article
Mathematics, Applied
Amrita Francis, Alejandro Ortiz-Bernardin, Stephane P. A. Bordas, Sundararajan Natarajan
FINITE ELEMENTS IN ANALYSIS AND DESIGN
(2020)
Article
Computer Science, Interdisciplinary Applications
Changkye Lee, Indra Vir Singh, Sundararajan Natarajan
Summary: In this paper, the cell-based smoothed finite-element method (CS-FEM) is proposed for solving boundary value problems of gradient elasticity in two and three dimensions. The method eliminates the need for explicit form of the shape functions and iso-parametric mapping. The results show that the proposed framework is accurate and robust.
ENGINEERING WITH COMPUTERS
(2023)
Article
Mechanics
Yicong Li, Tiantang Yu, Sundararajan Natarajan, Tinh Quoc Bui
Summary: This work aims to study dynamic crack propagation in brittle materials under time-dependent loading conditions using the adaptive isogeometric phase-field approach. The proposed approach combines the advantages of the phase-field method and isogeometric analysis, and is enhanced by utilizing locally refined non-uniform rational B-spline basis. The results demonstrate that the proposed approach can achieve accurate results with reduced degrees-of-freedom.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2023)
Article
Engineering, Multidisciplinary
Tiancheng Zhang, Hirshikesh, Tiantang Yu, Chen Xing, Sundararajan Natarajan
Summary: This work presents an adaptive phase-field method incorporated into a finite element framework combined with variable-node elements to investigate cohesive dynamic fracture. The proposed framework utilizes a hybrid form of the history field to drive the crack evolution and employs a staggered iteration scheme to compute the displacement and phase-field variables. The error indicator, utilizing the phase-field and history strain variables, is used to control the adaptive refinement process. The variable-node element technique facilitates adaptive mesh refinement and acts as a transition element between coarse and refined elements. The proposed method shows significant improvement in computational efficiency without sacrificing numerical accuracy.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2023)
Article
Engineering, Mechanical
M. D. Iqbal, C. Birk, E. T. Ooi, S. Natarajan, H. Gravenkamp
Summary: This paper extends the scaled boundary finite element method (SBFEM) to model fracture in functionally graded materials (FGMs) and examines the effects of fully coupled transient thermoelasticity. It utilizes the previously developed SBFEM supplementary shape functions to model thermal stresses and approximates the spatial variation of thermal and mechanical properties of FGMs by polynomial functions. The dynamic stress intensity factors (SIFs) are evaluated semi-analytically from their definitions without the need for additional post-processing. This approach is validated through numerical examples and comparison with reference solutions.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2023)
Article
Materials Science, Multidisciplinary
Rupesh Kumar Mahendran, Hirshikesh, Sundararajan Natarajan
Summary: This paper studies the effect of stress-diffusion interactions on the localization of plastic strain in an elastoplastic material using a fully coupled chemo-mechanical system. The transient coupled system is solved using a finite element formulation in the open-source finite element solver FEniCS. The role of geometric discontinuities and stress concentrations as well as plastic yielding on the diffusion-deformation process are investigated.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2022)
Article
Mathematics, Applied
Dibyendu Adak, Sundararajan Natarajan
Summary: This paper introduces a virtual element method for the time-dependent Stokes equation, where the velocity and pressure are approximated using different techniques based on the order of convergence. The method involves modifying the velocity space while maintaining the same dimension, and ensures stability and convergence for different values of k.
MATHEMATICS IN COMPUTER SCIENCE
(2021)
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)
