Article
Materials Science, Multidisciplinary
Maria Cinefra, Alberto Garcia de Miguel, Matteo Filippi, Caroline Houriet, Alfonso Pagani, Erasmo Carrera
Summary: The study assesses a novel homogenization method to transform a heterogeneous material with inclusions or holes into an equivalent homogeneous material with the same mechanical behavior. The method aims to improve computation time and enhance acoustic performance in the low-frequency range of passive acoustic metamaterial plates.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2021)
Article
Engineering, Civil
Francesco Nicassio, Maria Cinefra, Gennaro Scarselli, Matteo Filippi, Alfonso Pagani, Erasmo Carrera
Summary: The monitoring of composite Single Lap Joints' adhesion integrity is conducted using the MUL2 CODE, a software developed by the MUL2 Research Group. The Carrera Unified Formulation (CUF) implemented in the MUL2 CODE reduces computational costs for analyzing bonded joints. Through experimental verification and simulation, the Structural Health Monitoring (SHM) of damaged joints is effectively evaluated using transient excitations. The consistency and computational efficiency of the MUL2 formulation are demonstrated by comparing experimental, CUF, and Ansys results.
THIN-WALLED STRUCTURES
(2023)
Article
Engineering, Multidisciplinary
Behnam Daraei, Saeed Shojaee, Saleh Hamzehei-Javaran
Summary: This study presents a refinement of the finite strip method based on the Carrera unified formulation and applies it to the analysis of free vibration in variable stiffness composite laminated plates. The results demonstrate the effectiveness and usefulness of this method in practical applications.
INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING
(2022)
Article
Engineering, Mechanical
Wenxiang Teng, Pengyu Liu, Kun Hu, Jipeng He
Summary: This paper presents the analysis of metallic plates using refined finite elements in order to solve the problem of accurately reproducing the mechanical properties of metallic plates under complex working conditions while maintaining high accuracy and efficiency. The refined plate elements based on series expansion are utilized, and the Carrera unified formulation is introduced to express the plate displacement field. The accuracy and reliability of the refined plate models are verified by comparing them with several order models and solid models generated in the software ANSYS.
JOURNAL OF VIBRATION ENGINEERING & TECHNOLOGIES
(2023)
Article
Engineering, Electrical & Electronic
Shengtao Niu, Yanhao Guo, Hong Bao, Guojun Leng
Summary: This study presents an enhanced inverse finite-element method (iFEM) for reconstructing the deformation of homogeneity structures, including thin to thick plate models. The method establishes a clear relation between the structural mid-plane deformation field and discrete surface strain measurements, allowing for the deployment of strain sensors based on single-surface (top/bottom) strain information. Moreover, the algorithm takes into account the effect of transverse shear strain measurements and formulates the calculation process based on elasticity theory and strain-stress constitutive relation. The accuracy and applicability of the proposed method are validated through numerical and experimental tests on various thickness-width ratio plate structures.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2023)
Article
Materials Science, Multidisciplinary
Zahra Nouri, Saeid Sarrami-Foroushani, Fatemeh Azhari, Mojtaba Azhari
Summary: This paper presents the static and mechanical buckling analyses of thick functionally graded (FG) plates using Carrera's unified formulation (CUF) and the principle of virtual displacement. The proposed method transforms the governing three-dimensional (3D) elasticity equations to quasi-3D ones by employing thickness functions, allowing for the consideration of shear deformations. The accuracy of the method is evaluated and various parameters are investigated.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2022)
Article
Materials Science, Multidisciplinary
Yongqiang Kang, Jianguo Zhang, Hongmei Liu, Yun He, Jing Zhang
Summary: A tunable dual-band metamaterial absorber consisting of a gold square ring and a metal film separated by a strontium titanate dielectric was investigated. Two resonance peaks with over 99% absorbance were achieved at room temperature. The proposed absorber can be easily manufactured and extended to other frequencies for various applications.
RESULTS IN PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
Behnam Daraei, Saeed Shojaee, Saleh Hamzehei-Javaran
Summary: A new finite strip formulation based on Carrera unified formulation is developed in this article for the free vibration analysis of composite laminated plates, considering all three components of the displacement field in each nodal line. The numerical examples presented demonstrate the effects of various parameters on the analysis results.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2022)
Article
Mathematics, Applied
Yunqing Huang, Jichun Li, Xuancen Yi, Haoke Zhao
Summary: In this paper, a finite element method (FEM) is developed and analyzed for the Drude perfectly matched layer (PML) model. The stability analysis and error estimate for the scheme are established. Numerical results demonstrate the effectiveness of this PML in absorbing outgoing waves in the Drude metamaterial.
JOURNAL OF COMPUTATIONAL AND APPLIED MATHEMATICS
(2024)
Article
Acoustics
Vinicius F. Dal Poggetto, Alberto L. Serpa
Summary: The development of periodic metamaterials for attenuation of low- and mid-frequency range vibrations has been thoroughly studied. In this paper, a ternary periodic metamaterials made of concentric circular inclusions of a rigid material coated with a soft material is investigated, showing the validity of the Mindlin plate model and its potential practical applications.
JOURNAL OF SOUND AND VIBRATION
(2021)
Article
Chemistry, Physical
Weige Liang, Tao Liu, Chi Li, Qingshan Wang
Summary: In this paper, a novel and unified model for studying the vibration of cylindrical shells is presented. The model combines the three-dimensional elastic theory and the Carrera Unified Formulation, enabling accurate prediction of vibrational behavior under arbitrary boundary conditions. The model utilizes expansion of displacements using Chebyshev polynomials and Taylor series, as well as introduction of artificial boundary surface springs and coupling springs. The approach is validated through comparison with existing results and finite element analysis, and simulation results of frequency features are presented. The comprehensive model and simulation results contribute to advancements in the field of structural engineering.
Article
Chemistry, Physical
Linzhongyang E, Zhijing Wu, Fengming Li, Guangping Zou
Summary: In this study, elastic metamaterial sandwich plates with axially deformed Timoshenko beam cores were designed and their vibration band-gap properties were explored. The finite element method (FEM) and the spectral element method (SEM) were combined to establish the dynamic model and calculate the frequency response functions (FRFs) of the plates. It was found that the metamaterial sandwich plates possess both axial and transverse vibration band-gaps, and those with axially deformed beam cores have wider application ranges for vibration reduction compared to plates with rod cores.
Article
Engineering, Multidisciplinary
E. Salete, A. M. Vargas, A. Garcia, J. J. Benito, F. Urena, M. Urena
Summary: This paper introduces the Generalized Finite Difference Method and its application in different formulations of the wave propagation problem. It provides explicit schemes for various formulations and criteria for stability and convergence. The study also completes the analysis of phase and group velocity dispersion, and compares the efficiency, convenience, and accuracy of different formulations in wave propagation problems.
APPLIED MATHEMATICAL MODELLING
(2021)
Article
Chemistry, Physical
Alejandro Ortega Laborin, Emmanuel Roubin, Yann Malecot, Laurent Daudeville
Summary: This paper conducts an in-depth study on the theoretical basis of strong discontinuity methods for local fracture simulations using the Embedded Finite Element Method (E-FEM). A new proposal of strong discontinuity enhancement functions is presented, improving basic kinematic coherence and robustness of E-FEM techniques for fracture simulations. Simulation results demonstrate increased robustness and potential for higher level application of E-FEM techniques.
Article
Chemistry, Physical
Yousef Navidtehrani, Covadonga Betegon, Emilio Martinez-Paneda
Summary: This study presents a simple and robust implementation of the phase field fracture method in Abaqus, utilizing only the UMAT subroutine and showing potential and robustness in addressing various fracture scenarios. The new implementation is capable of reproducing numerical and experimental results, capturing complex crack trajectories, and solving contact problems efficiently, with the developed code freely available for use.
Article
Materials Science, Multidisciplinary
A. Pagani, E. Carrera
Summary: A displacement-based high order one-dimensional (1D) finite element model is proposed in this paper for the nonlinear analysis of isotropic, slightly compressible soft material structures. The model, based on Carrera unified formulation and first-invariant hyperelasticity, can address simple to complex nonlinear hyperelastic phenomena.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2023)
Article
Mechanics
A. Pagani, R. Azzara, E. Carrera
Summary: This study presents a novel numerical approach for studying the vibration behaviors of variable angle tow (VAT) composite structures. The method predicts buckling load, investigates frequency variation with increasing load, and verifies experimental results. The use of VAT composites improves buckling performance and design space.
Article
Materials Science, Multidisciplinary
AlfonsoJM Pagani, Riccardo Augello, Erasmo Carrera
Summary: In this article, the geometrical nonlinear behavior of deployable booms is investigated. A mathematical model based on Carrera unified formulation is proposed to describe the behavior of the booms. Experimental tests and investigation of different lamination sequences validate the proposed approach and offer valuable perspectives for future designs.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2023)
Article
Materials Science, Multidisciplinary
Sajedeh Khosravani, Mohammad Homayoune Sadr, Erasmo Carrera, Alfonso Pagani
Summary: In this study, randomly three-dimensional graphene foam (RGF) was synthesized and used to prepare RGF/epoxy composite material. Tensile testing showed that the drying percentage of RGF had a significant effect on the mechanical properties of the composite. Furthermore, multi-scale numerical methods were employed to obtain the mechanical properties of the RGF/epoxy composite material.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2023)
Article
Materials Science, Multidisciplinary
J. Shen, M. R. T. Arruda, A. Pagani
Summary: This paper presents a numerical damage analysis method for concrete structures using higher-order beam theories based on Carrera Unified Formulation (CUF). A continuum damage mechanics model and a modified Mazars concrete damage model are used to model the concrete constitutive relation, and an expression is proposed to estimate the characteristic length to avoid mesh dependency. The proposed model is validated through comparison with experimental results, demonstrating its low computational costs and 3D accuracy.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2023)
Article
Mechanics
E. Carrera, R. Augello, A. Pagani, D. Scano
Summary: This paper explores theories of structures based on hierarchical Jacobi expansions for the static analysis of multilayered beams, plates, and shells. These expansions belong to the family of classical orthogonal polynomials. The Carrera Unified Formulation (CUF) is employed, allowing for the generation of finite element stiffness matrices in a straightforward manner. Both layer-wise and equivalent single layer approaches are used in the analysis of one-dimensional beams and two-dimensional plates and shells, with multiple case studies analyzed. The convenience of using equivalent single layer models for displacement, in-plane stress, and shear stress calculations is demonstrated, while layer-wise models accurately predict structural behavior at the cost of higher degrees of freedom.
COMPOSITE STRUCTURES
(2023)
Article
Mechanics
J. A. Moreira, F. Moleiro, A. L. Araujo, A. Pagani
Summary: In this work, high-order layerwise modelling of variable stiffness composite laminates with curvilinear fibre paths using user-elements (UEL) in Abaqus is proposed. Two layerwise UEL models, UEL1 and UEL3, are developed and evaluated by comparing with existing solutions in the literature. The results show that the developed models can provide accurate and efficient results, particularly for predicting the global-local response behavior of moderately thick plates.
COMPOSITE STRUCTURES
(2023)
Article
Materials Science, Multidisciplinary
Mina Jahanmardi, Hossein Hosseini-Toudeshky, Mohammad Saeed Goodarzi, Erasmo Carrera, Alfonso Pagani
Summary: In this study, a damage zone model was used to simulate the material behavior and damage evolution in PU elastomers with different shore hardness. Experimental tests were conducted to determine the material characteristics, and a numerical analysis procedure was developed to predict the damage evolution in the pure shear tearing specimen.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2023)
Article
Materials Science, Multidisciplinary
J. Shen, M. R. T. Arruda, A. Pagani, E. Carrera
Summary: This work presents a numerical method for damage analysis of reinforced concrete beams using the higher-order beam theory based on Carrera unified formulation. The component-wise approach is employed to model the concrete and steel reinforcing bars as two independent one-dimensional finite elements. A modified Mazars damage model with tensile and compressive damage propagation laws is utilized for concrete, and an elastic-perfectly plastic law is used for steel rebars. A fracture energy regularization technique based on the crack band model is developed to address the instability and mesh dependence caused by the strain-softening behavior of concrete, especially for the higher-order beam theory.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2023)
Article
Materials Science, Multidisciplinary
A. Pagani, P. Chiaia, M. Filippi, M. Cinefra
Summary: This work presents a displacement-based finite element model for analyzing large strains in isotropic compressible and nearly-incompressible hyperelastic materials. The constitutive law is formulated in terms of invariants of the right Cauchy-Green tensor and both coupled and decoupled formulations of strain energy functions are introduced. A penalty function is used to enforce the incompressibility constraint. The nonlinear governing equations are obtained using a total Lagrangian formulation and the principle of virtual displacements. The paper also derives the analytic expressions for the internal forces vector and tangent matrix of linear and high-order hexahedral finite elements using a three-dimensional formalism based on the Carrera Unified Formulation. The capabilities of the implementation are demonstrated through the analysis of benchmark problems involving compressible and nearly-incompressible beams, cylindrical shells, and curved structures in hyperelasticity.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2023)
Article
Materials Science, Multidisciplinary
Riccardo Augello, Alfonso Pagani, Erasmo Carrera
Summary: The aim of this study is to analyze the effect of different materials on the folding behavior of ultrathin tape spring hinges. A refined 2D shell model is developed using the Finite Element Method (FEM) combined with the Carrera Unified Formulation (CUF). The model is capable of dealing with different materials and can introduce different theoretical approximations automatically. The results, in the form of moment angle curves, are provided for different materials and structure thickness.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2023)
Article
Materials Science, Multidisciplinary
M. Petrolo, A. Pagani, M. Trombini, E. Carrera
Summary: This study investigates the impact of voids in composite materials on local stress and plastic strain values through micromechanical analysis. The microscale Representative Volume Element (RVE) is modeled using refined 1D elements based on the Carrera Unified Formulation (CUF), resulting in reduced computational costs compared to standard 3D elements. The fibers are orthotropic and the matrix exhibits elastoplastic behavior. Random void distributions and statistical analyses are considered, along with the influence of RVE depth. The results demonstrate significant increases in mean and peak stress values as the void volume fraction increases, and deeper RVEs result in higher stress values.
MECHANICS OF MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Piero Chiaia, Alfonso Pagani, Maria Cinefra, Erasmo Carrera
Summary: This work proposes high-order finite element models for analyzing large strain in compressible and incompressible transversely isotropic hyperelastic media. The models are defined within the Carrera Unified Formulation framework and incorporate a strain energy density function adopted in fiber-reinforced hyperelastic materials modeling. The tangent elasticity tensor is derived through a coupled formulation of strain energy functions. Refined nonlinear beam and plate models are defined in a total Lagrangian formulation to analyze soft materials and structures. Numerical solutions are obtained using the Newton-Raphson linearization scheme coupled with the arc-length constraint. Benchmark analyses are performed to validate the capabilities and reliability of the proposed models.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2023)
Article
Mechanics
Riccardo Augello, Erasmo Carrera, Alfonso Pagani, Mario R. T. Arruda, Jiahui Shen
Summary: This paper proposes a node-dependent kinematics technique for efficient mathematical modeling of reinforced concrete structures. The approach allows for optimized models in terms of accuracy and computational resource utilization, with limited three-dimensional accuracy only in the area of interest.
MATHEMATICS AND MECHANICS OF COMPLEX SYSTEMS
(2023)
Proceedings Paper
Engineering, Civil
Marco Enea, Alfonso Pagani, Erasmo Carrera
Summary: In recent years, machine learning algorithms have been widely used in structural health monitoring. Utilizing Artificial Neural Networks (ANN) and Convolutional Neural Networks (CNN), accurate mapping of damages in structures can be achieved through surface strain/displacement based detection. By using Carrera Unified formulation (CUF) based finite element models and Monte Carlo simulations, the trained CNN is capable of detecting and classifying all damages within the structure.
EUROPEAN WORKSHOP ON STRUCTURAL HEALTH MONITORING (EWSHM 2022), VOL 3
(2023)
Article
Acoustics
Sandip Chajjed, Mohammad Khalil, Dominique Poirel, Chris Pettit, Abhijit Sarkar
Summary: This paper reports the generalization of the Bayesian formulation of the flutter margin method, which improves the predictive performance by incorporating the joint prior of aeroelastic modal parameters. The improved algorithm reduces uncertainties in predicting flutter speed and can cut cost by reducing the number of flight tests.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Pascal Zeise, Bernhard Schweizer
Summary: Air ring bearings are an improved version of classical air bearings, providing better damping behavior and allowing operation above the linear threshold speed of instability. However, there is a risk of dangerous vibrations in certain rotor systems, which can be addressed by considering ring tilting effects.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Zbynek Sika, Jan Krivosej, Tomas Vyhlidal
Summary: This paper presents a novel design of a compact six degrees of freedom active vibration absorber with six identical eigenfrequencies. The objective is to completely suppress the vibration of a machine structure with six motion components. By utilizing a Stewart platform structure equipped with six active legs, a spatial unifrequency absorber with six identical eigenfrequencies is achieved. The design is optimized using a correction feedback and active delayed resonator feedback.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Kai Li, Yufeng Liu, Yuntong Dai, Yong Yu
Summary: This paper presents a novel light-powered self-oscillating liquid crystal elastomer (LCE) bow that can self-oscillate continuously and periodically under steady illumination. The dynamics of the LCE bow are theoretically investigated and numerical calculations predict its motion regimes. The suggested LCE bow offers potential advantages in terms of simple structure, customizable size, flexible regulation, and easy assembly.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Carmelo Rosario Vindigni, Giuseppe Mantegna, Calogero Orlando, Andrea Alaimo
Summary: In this study, a simple adaptive flutter suppression system is designed to increase the operative speed range of a wing-aileron aeroelastic plant. The system achieves almost strictly passivity by using a parallel feed-forward compensator implementation and the controller parameters are optimized using a population decline swarm optimization algorithm. Numerical simulations prove the effectiveness of the proposed simple adaptive flutter suppression architecture in different flight scenarios.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Nicco Ulbricht, Alain Boldini, Peng Zhang, Maurizio Porfiri
Summary: The quantification of fluid-structure interactions in marine structures is crucial for their design and optimization. In this study, an analytical solution for the free vibration of a bidirectional composite in contact with a fluid is proposed. By imposing continuity conditions and boundary conditions, the coupled fluid-structure problem is solved and applied to sandwich structures in naval construction, offering insights into the effects of water on mode shapes and through-the-thickness profiles of displacement and stress.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Shahram Hadian Jazi, Mostafa Hadian, Keivan Torabi
Summary: Non-uniformity and damage are the main focus in studying vibrations of beam elements. An exact closed-form explicit solution for the transverse displacement of a nonuniform multi-cracked beam is introduced using generalized functions and distributional derivative concepts. By introducing non-dimensional parameters, the motion equation and its closed-form solution are obtained based on four fundamental functions. The impact of crack count, location, intensity, and boundary conditions on natural frequency and mode shape is evaluated through numerical study.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Eugenio Tramacere, Marius Pakstys, Renato Galluzzi, Nicola Amati, Andrea Tonoli, Torbjoern A. Lembke
Summary: This paper proposes the experimental stabilization of electrodynamic maglev systems by means of passive components, providing key technological support for the Hyperloop concept of high-speed and sustainable transportation.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Pengfei Deng, Xing Tan, He Li
Summary: In this paper, the authors improve the surface morphology method and study the bit-rock interaction model between the rock and the PDC bit, taking into account the impact of blade shape and cutter arrangement. They establish a dynamic model for a deep drilling system equipped with an arbitrary shape PDC bit and propose a stability prediction method. The results show that the shape of the blades and arrangement of the cutters on the PDC bit significantly affect the nonlinear vibration of the drilling system.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Salvador Rodriguez-Blanco, Javier Gonzalez-Monge, Carlos Martel
Summary: In modern LPT designs, the simultaneous presence of forced response and flutter in different operation regimes is unavoidable. Recent evidence suggests that the traditional linear superposition method may be overly conservative. This study examines the flutter and forced response interaction in a realistic low pressure turbine rotor and confirms that the actual response is much smaller than that predicted by linear superposition.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Kabilan Baskaran, Nur Syafiqah Jamaluddin, Alper Celik, Djamel Rezgui, Mahdi Azarpeyvand
Summary: This study investigates the impact of the number of blades on the aeroacoustic characteristics and aerodynamic performance of propellers used in urban air mobility vehicles. The results show that different blade numbers exhibit distinct noise levels, providing valuable insights for further research on propeller noise and aerodynamic performance.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Yongbo Peng, Peifang Sun
Summary: This study focuses on the reliability-based design optimization (RBDO) of the tuned mass-damper-inerter (TMDI) system under non-stationary excitations. The performance of the optimized TMDI system is evaluated using probability density evolution analysis. The results demonstrate the technical advantages of TMDI, including high vibration mitigation performance, considerable mass reduction, and less stroke demand.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Guanfu Lin, Zhong-Rong Lu, Jike Liu, Li Wang
Summary: Vision-based measurement is an emerging method that enables full-field measurement with non-contact and high spatial resolution capabilities. This paper presents a single-camera method for measuring out-of-plane vibration of plate structures using motion-parametric homography to capture image variation and displacement response.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Bronislaw Czaplewski, Mateusz Bocian, John H. G. Macdonald
Summary: Despite two decades of study, there is currently no model that can quantitatively explain pedestrian-generated lateral forces. This research proposes a foot placement control law based on empirical data to calibrate and generalize the rigid-leg inverted pendulum model (IPM) for predicting lateral structural stability.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Justine Carpentier, Jean-Hugh Thomas, Charles Pezerat
Summary: This paper proposes an improved method for the identification of vibration sources on a car window using the corrected force analysis technique. By redefining inverse methods in polar coordinates, more accurate results can be obtained.
JOURNAL OF SOUND AND VIBRATION
(2024)
