Article
Mechanics
Payam Poorsolhjouy, Marcial Gonzalez
Summary: This study presents constitutive laws of structural members using granular micromechanics approach, deriving macroscopic behavior by investigating average behavior of grain-pair interactions. Closed-form solutions for constitutive relationship of uniform and functionally graded materials are derived, demonstrating versatility and computational efficiency of the proposed approach. Analyzing structural members made of particle-binder composites reveals interesting one-way and two-way coupling behavior between internal forces and moments that cannot be achieved through closed-form solutions.
COMPOSITE STRUCTURES
(2021)
Article
Construction & Building Technology
Guermit Mohamed Bilal Chami, Amar Kahil, Lazre Hadji, Royal Madan, Abdelouah Tounsi
Summary: This study conducted free vibration analysis of multi-directional porous functionally graded sandwich plates, considering two cases: FG skin with homogeneous core and FG core with homogeneous skin. Hamilton's principle and Navier's technique were used to obtain the solution, and the results were validated with literature data. The findings indicate that multi-directional functionally graded structures perform better than uni-directional gradation.
STEEL AND COMPOSITE STRUCTURES
(2023)
Article
Mechanics
Supen Kumar Sah, Anup Ghosh
Summary: This article investigates the free vibration and buckling of multi-directional porous FGM sandwich plates, obtaining equilibrium equations based on sinusoidal shear deformation theory and using Navier's solution technique for simply supported cases. Different porous distribution models are considered for the FGM face sheets, and the influence of various factors on the natural frequency and critical buckling load of the sandwich plate is analyzed.
COMPOSITE STRUCTURES
(2022)
Article
Mechanics
Hau Nguyen-Ngoc, Thanh Cuong-Le, Khuong D. Nguyen, H. Nguyen-Xuan, Magd Abdel-Wahab
Summary: This study proposes numerical models of three-dimensional (3D) shells made of multi-directional functionally graded material (FGM) using polyhedral finite element methods with arbitrary polyhedral elements (Poly-FEM). The effects of shell thickness and the variation of material properties based on the power law are investigated. Two latest interpolation schemes, namely polytopal composite scheme (PCEM) and consecutive interpolation scheme (CIPFEM), are used for analysis. Verification studies show that the results obtained from these schemes are reliable. Static and dynamic analyses are conducted to investigate the displacement, normal stress, and free vibration of the shell.
COMPOSITE STRUCTURES
(2023)
Article
Engineering, Civil
Ali Alnujaie, Atteshamuddin S. Sayyad, Lazreg Hadji, Abdelouahe Tounsi
Summary: This article investigates the buckling and free vibration of multi-directional functionally graded material (FGM) sandwich plates. By considering the continuous variation of material properties in different directions, the buckling and vibration characteristics of multi-directional FGM sandwich plates are analyzed. The results show that multi-directional FGM structures outperform uni-directional graded structures.
STRUCTURAL ENGINEERING AND MECHANICS
(2022)
Article
Engineering, Marine
C. C. Hong
Summary: In this study, the effects of the third-order shear deformation theory (TSDT) on thick functionally graded material (FGM) plates-cylindrical shells under thermal vibration were investigated using the generalized differential quadrature (GDQ) method. The results show that the advanced nonlinear shear correction, FGM power law index, and environment temperature have significant influences on the thermal stress and center displacement of FGM plates-cylindrical shells.
Article
Mechanics
Lilin Zhou
Summary: This study investigates the similitude distortion of sandwich FGM plates and shells in high-temperature environments for the first time. The Energy Similitude Correction Method proposed by the author is used to solve the distortion caused by non-scalability of material properties and thermal effects. The method is extended to various shapes of shells and considers the impact of heat conduction, thermal expansion, and temperature-dependent material properties. Numerical examples show that the prediction approach is accurate and widely applicable.
COMPOSITE STRUCTURES
(2023)
Article
Mechanics
A. Pagani, E. Carrera, R. Augello, D. Scano
Summary: This paper introduces an equivalent single-layer approach for modeling laminated structures, using the Finite Element method and Carrera Unified Formulation to provide numerical solutions and demonstrating its advantages in analyzing displacements and stress distribution.
COMPOSITE STRUCTURES
(2021)
Article
Mathematics, Interdisciplinary Applications
Savvas Saloustros, Miguel Cervera, Sungchul Kim, Michele Chiumenti
Summary: This paper investigates the capacity of solid finite elements with independent interpolations for displacements and strains to address shear, membrane, and volumetric locking in the analysis of beam, plate, and shell structures. The proposed strain/displacement formulation shows enhanced accuracy in predicting stresses and displacements, as well as producing locking-free discrete solutions that converge asymptotically to the corresponding continuous problems. The study also considers the effect of discretization and material characteristics, including different solid element typologies, shapes, and isotropic, orthotropic, and layered materials.
COMPUTATIONAL MECHANICS
(2021)
Article
Engineering, Civil
Van-Chinh Nguyen, Huu-Quoc Tran, Van-Vinh Pham
Summary: This study investigates the nonlinear static behaviors of bi-directional functionally graded (2D-FGM) sandwich plates on an elastic foundation in thermal environments. The plates are composed of two 2D-FGM face sheets and a homogeneous core layer, with material properties changing according to the power law in both longitudinal and thickness directions and exhibiting temperature-dependent characteristics. A higher-order finite element model based on Shi's plate theory is established, and the nonlinear equilibrium equations are solved using the Newton-Raphson iterative procedure. The proposed model's accuracy and convergence are confirmed through numerical examples and parametric studies.
THIN-WALLED STRUCTURES
(2023)
Article
Engineering, Civil
Sundaramoorthy Rajasekaran, Hossein B. Khaniki, Mergen H. Ghayesh
Summary: This paper investigates the static, stability, and free vibration behavior of multi-layer multi-directional functionally graded sandwich thin rectangular plates under thermo-mechanical loadings. Various physical properties and boundary conditions are considered, and the temperature-position-dependent physical properties are obtained using the rule of mixture. The modified differential quadrature method is used to model different types of plates. The results suggest that this methodology is effective, simple, and accurate. The study also presents the first investigation of MDFG plates and layered composite structures under thermo-mechanical conditions, and discusses the advantages of using MDFG sandwich plates.
THIN-WALLED STRUCTURES
(2022)
Article
Physics, Multidisciplinary
Saeed Mirzaei, Mehrdad Hejazi, Reza Ansari
Summary: This paper uses the isogeometric analysis based on non-uniform rational B-spline (NURBS) basis functions to study the mechanical properties of multi-directional functionally graded porous plates. By considering the shear deformation effect and using the rule of mixture and Mori-Tanaka scheme to estimate material properties, the bending, buckling and free vibration of the plates are evaluated, and the effectiveness of the method is verified.
EUROPEAN PHYSICAL JOURNAL PLUS
(2022)
Article
Mechanics
Chao Wang, Liangliang Ma, Yang Bu, Jie Zhao, Kang Hao Cheong
Summary: This study proposes an effective approach for the optimal material distribution design of bi-directional functionally graded plates (2D-FGPs) with complex shapes. By combining multi-patch isogeometric analysis and an improved multi-objective particle swarm optimization algorithm, it achieves a unified CAD/CAE optimization design of 2D-FGPs across multiple non-smooth boundaries.
COMPOSITE STRUCTURES
(2023)
Article
Mathematics, Applied
Jan Awrejcewicz, Lidiya Kurpa, Tetyana Shmatko
Summary: This study investigates the free vibration of plates and shallow shells made of functionally graded materials with temperature dependent mechanical characteristics. The analysis employs variational FG shallow shells and first-order shear deformation theory, with material properties varying through thickness according to a power-law distribution of the constituent's volume fraction. The temperature field is modelled using a one-dimensional heat transfer equation, with software developed to implement the proposed approach for vibration analysis of FG plates and shallow shells with cutouts under various boundary conditions.
ZAMM-ZEITSCHRIFT FUR ANGEWANDTE MATHEMATIK UND MECHANIK
(2021)
Article
Engineering, Civil
Prashik Malhari Ramteke, Nitin Sharma, Madhuresh Dwivedi, Chaitanya Rajendra Uttarwar, Subrata Kumar Panda, Sarthak Kumar Das
Summary: A novel finite element algorithm is developed to analyze the eigenvalue characteristics of porous functionally graded curved panels under thermal conditions. The algorithm considers material grading along the length and thickness, including unidirectional and bidirectional gradings. The algorithm uses a mathematical model based on the higher-order theory to solve the structural governing equation and predict the eigenvalues. Experimental validation is performed on natural fiber-reinforced polymeric layered FG plates with linearly varying properties. Parametric studies are conducted to examine the effect of input variables on the thermal frequencies of the graded panel.
Article
Acoustics
Akshay Pawgi, Akshay Bharadwaj Krishna, Shikhar Gupta, Paul A. Praveen, Ananda Babu Arumugam, Edwin P. Sudhagar
Summary: In this study, the dynamic characteristics of graphene-reinforced glass fiber-reinforced polymer hybrid uniform and thickness tapered laminated composite beams were investigated numerically and experimentally. The results reveal that the addition of graphene can significantly improve the natural frequencies of the hybrid beams, especially when the weight fraction of graphene is low.
JOURNAL OF VIBRATION AND CONTROL
(2023)
Article
Materials Science, Multidisciplinary
Muthukumaran Gunasegeran, P. Edwin Sudhagar
Summary: This study investigates the vibration behavior of GFRP corrugated bio-inspired sandwich beams using higher-order shear deformation theory (HSDT). The results show that the core configurations and ply arrangements significantly affect the stiffness and natural frequencies of the sandwich beams.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2023)
Article
Engineering, Civil
Akhil Chadha, P. Edwin Sudhagar, Muthukumaran Gunasegeran, Vimalanand Suthenthira Veerappa
Summary: The study investigates the free vibration analysis of laminated and sandwich conical shell structures with various foam cores, which are widely used in aerospace and automotive industries. Experimental and numerical simulations show minimal variation in the vibration characteristics. Parametric analyses are conducted to study the effects of length, ply orientation, boundary conditions, multiple core materials, and core thickness on the vibration behaviors of the structures.
INTERNATIONAL JOURNAL OF STRUCTURAL STABILITY AND DYNAMICS
(2023)
Article
Mechanics
R. Caleb Daniel, P. Edwin Sudhagar
Summary: This article evaluates the transverse shear modulus of the sandwich core structure of 3D-printed bioinspired materials. A bioinspired structural design mimicking the microstructural layer of a woodpecker's beak is used, incorporating wavy patterns with the conventional honeycomb shape. Among the tested materials, CF-PLA demonstrates the highest transverse shear modulus.
MECHANICS BASED DESIGN OF STRUCTURES AND MACHINES
(2023)
Article
Engineering, Civil
Muthukumaran Gunasegeran, P. Edwin Sudhagar, Maiarutselvan Vasudevan, Manoharan Ramamoorthy, Anandababu Arumugam
Summary: This study investigates the energy absorption, load response, failure modes, and damage mechanics of a sandwich structure under quasi-static indentation. The results show good agreement between the experimental and numerical analysis results, indicating the importance of choosing an appropriate core structure for lightweight sandwich structures.
THIN-WALLED STRUCTURES
(2023)
Article
Engineering, Mechanical
Kamal Kishore Joshi, Vishesh Ranjan Kar
Summary: This study investigates the elastoplastic behavior of multidirectional functionally graded composite panels with different porosities. Elastic properties are determined using modified multi-variable power-law functions, while the Tamura-Tomota-Ozawa (TTO) model is used for elastoplastic properties. To account for geometrical nonlinearity, a first-order shear deformation theory-based von Karman strain kinematics is employed, and von Mises yield criterion with bilinear isotropic strain hardening is used for material nonlinearity. The governing equation is obtained through the variational principle and solved using 2D isoparametric finite element approximations and the Newton-Raphson iterative technique. The accuracy of the model is validated by comparing with reported results, and the load-deflection responses of the composite panels are presented and discussed.
IRANIAN JOURNAL OF SCIENCE AND TECHNOLOGY-TRANSACTIONS OF MECHANICAL ENGINEERING
(2023)
Article
Engineering, Multidisciplinary
G. Lawrance, P. Sam Paul, Jazeel Mohammed, Muthukumaran Gunasegeran, P. Edwin Sudhagar
Summary: In the manufacturing industry, tool vibration, tool wear, and surface finish are the crucial factors influencing product quality and production costs. To enhance cutting performance, Buffered Impact Dampers (BID) were designed and tested. Experimental results showed that BID increased the tool holder's rigidity and effectively suppressed tool vibration, leading to improved cutting performance. Artificial Neural Network (ANN) was employed to predict the impact of BID on various parameters, and the comparison between ANN model and experimental results yielded consistent conclusions.
MULTISCALE AND MULTIDISCIPLINARY MODELING EXPERIMENTS AND DESIGN
(2023)
Article
Materials Science, Composites
Mrityunjay Kumar, Souvik Singh Rathore, Vishesh Ranjan Kar, Madan Lal Chandravanshi
Summary: This article examines the non-linear free vibration behavior of sandwich composite panels with sinusoidal corrugations. By modeling and optimizing various parameters, the non-linear frequencies under different conditions are obtained.
POLYMER COMPOSITES
(2023)
Article
Materials Science, Multidisciplinary
B. A. Khudayarov, F. Turaev, Vishesh R. Kar, A. A. Verlan
Summary: This paper investigates the nonlinear flutter phenomenon of viscoelastic three-layer plates and shallow shells with a structure asymmetrical in thickness under a supersonic gas flow. Mathematical models are developed for the flutter of viscoelastic three-layer plates, cylindrical panels, and shells with a structure asymmetrical in thickness under a supersonic gas flow. The flutter of viscoelastic three-layer plates is studied in both linear and nonlinear formulations, and the critical flutter velocities of elongated plates are compared with previous studies conducted under an elastic formulation. Furthermore, the flutter of viscoelastic three-layer plates and cylindrical panels with a rigid filler that resists transverse shear under an external supersonic flow is investigated, revealing a 25-40% increase in flutter velocity with an increase in the flexural rigidity of the bearing layers of three-layer structures.
INTERNATIONAL JOURNAL OF COMPUTATIONAL MATERIALS SCIENCE AND ENGINEERING
(2023)
Article
Multidisciplinary Sciences
Swagatika Acharya, Vijay K. K. Mishra, Sumanta Chaudhuri, Jitendra Kumar Patel, Prakash Ghose, Vishesh Ranjan Kar
Summary: This study explores the application of a hybrid genetic algorithm (GA)-supervised Kohonen (SK) map in the decision support system for porous ceramic matrix (PCM)-based burners. Four selected features of the PCM are used to define the burner's operating regime, resulting in 16 distinct regime classifications. The hybrid GA-SK map is trained using the generated temperature profiles of the PCM, and is able to accurately predict the regime of operation for new PCM samples. Minor attributes of the hybrid GA-SK map are adjusted to improve the accuracy of regime prediction. The use of a hexagonal grid with eigen values initialization of weights achieves the highest average class prediction (acp) of 57.14%. A 10 x 10 network size with 300 epochs and eigen values weight initialization achieves a high optimization criterion of 0.79, while maintaining a high frequency of 0.6. This research aims to strengthen the hybrid GA-SK map approach for decision support in PCM-based burners.
ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
(2023)
Article
Engineering, Civil
Souvik S. Rathore, Vishesh R. Kar
Summary: This study focuses on the dynamic analysis of thermal barrier coated straight and curved turbine blades, which are modeled as functionally graded sandwich panels in a thermal environment. The findings reveal that the functionally graded sandwich composite blade is made up of a functionally graded face-sheet material and a metal alloy core, with temperature-dependent material properties. The overall properties are evaluated using Voigt's micromechanical scheme and the modified power-law functions. The blade model uses the equivalent single-layer shear deformation theory, and the equations of motion are derived using the extended Hamilton's principle and solved using 2D-isoparametric finite element approximations. Mesh refinement and validation tests are conducted to demonstrate the stability and accuracy of the model. Additionally, the frequency characteristics of the pre-twisted rotating sandwich blades are computed under various parametric conditions, providing useful insights for designing blade type structures for turbine operations.
STRUCTURAL ENGINEERING AND MECHANICS
(2023)
Article
Engineering, Aerospace
Shyam K. Chaudhary, Vishesh R. Kar, Karunesh K. Shukla
Summary: The article investigates the thermoelastic deformation behavior of inhomogeneous functionally graded metal/ceramic cylindrical shell structure with multiple perforations using 2D finite element approximation. The temperature-dependent elastic and thermal properties are evaluated using Voigt's micromechanical material scheme via power-law function. The proposed model is based on the equivalent single-layer first-order shear deformation mid-plane theory.
ADVANCES IN AIRCRAFT AND SPACECRAFT SCIENCE
(2023)
Article
Multidisciplinary Sciences
Souvik Singh Rathore, Vishesh Ranjan Kar, Sanjay
Summary: This paper presents the thermodynamic performance of state-of-the-art silicon carbide fiber-reinforced silicon carbide matrix composite (SiCf/SiC)-bladed gas turbines. The study compares two different gas turbine power systems: the basic gas turbine cycle and the intercooled gas turbine cycle. The results show that SiCf/SiC-bladed gas turbines require significantly less blade coolant and exhibit superior thermodynamic performance compared to traditional single-crystal superalloy-bladed systems. The performance maps indicate that replacing existing single-crystal superalloy blades with ceramic matrix composite blades would lead to improved thermodynamic efficiency, even at high firing temperatures.
ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
(2023)
Article
Engineering, Multidisciplinary
Pankaj S. Ghatage, P. Edwin Sudhagar
Summary: In this work, the frequency characteristics of bi-directional functionally graded rectangular panels with and without porosities are studied using 3D finite element approximations. The developed model is validated by comparing the obtained findings with previous literature. Parametric research is conducted to investigate the influence of geometrical and material parameters on the frequency characteristics of the panels. The developed 3D FEM model will serve as a reference for future research in this area.
INTERNATIONAL JOURNAL OF INTEGRATED ENGINEERING
(2023)
Article
Engineering, Civil
Pankaj S. Ghatage, P. Edwin Sudhagar
Summary: This study investigates the free vibrational responses of bi-directional axially graded cylindrical shell panels under a temperature field using 3D graded finite element approximation. The shell panels are graded in two directions and made of metal-ceramic materials. The Voigt model combined with a Power-law material distribution is used to determine material properties. Convergence and validation studies are conducted to ensure the accuracy and effectiveness of the developed computational model. A parametric study is also performed to assess the impact of geometrical parameters, material imperfections (porosity), support conditions, and surface temperature on the free vibration responses of the shell panels in a thermal environment.
STRUCTURAL ENGINEERING AND MECHANICS
(2023)
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)
