Article
Engineering, Multidisciplinary
Qing Song Lu, Zhi Yong Ai, Ming Jing Jiang, Wen Jie Liu
Summary: This study investigates the time-varying mechanical performance of partially embedded pile groups in multilayered cross-anisotropic fractional viscoelastic saturated soils under vertical loads, revealing significant influences of fractional derivative order, free length, pile spacing, and pile-soil stiffness ratio on their time effects. The proposed method is verified to be correct through comparisons with existing solutions and an ABAQUS model.
ENGINEERING ANALYSIS WITH BOUNDARY ELEMENTS
(2021)
Article
Engineering, Multidisciplinary
L. L. Ferras, M. Rebelo, M. L. Morgado
Summary: The significance of the weighting function (c(α)) in the Generalised Distributed-Order Maxwell (GDOM) model is investigated in this study. The GDOM model, consisting of a distributed springpot and a dashpot in series, is more complex than the Fractional Viscoelastic Fluid (FVF) model. However, the relatively simple GDOM model provides a better understanding of its behavior in different flow scenarios. Fitting analyses using experimental data validate the findings, showing that the GDOM model accurately captures the fluid-like viscoelastic behavior observed in polymer systems.
APPLIED MATHEMATICAL MODELLING
(2023)
Article
Mathematics, Interdisciplinary Applications
Timi Karner, Rok Belsak, Janez Gotlih
Summary: This study proposes a fully fractional generalised Maxwell model to capture the viscoelastic effect of dielectric elastomer actuators. The Laplace transform and Pattern Search global optimization procedure are used to derive the optimal parameters and number of branches of the model.
FRACTAL AND FRACTIONAL
(2022)
Article
Mechanics
Benjamin Tressou, Mikael Gueguen, Carole Nadot-Martin
Summary: This paper presents the new developments of the EIV approach in the context of linear viscoelasticity and demonstrates its efficiency and application in various microstructures. The generalized EIV approach is evaluated and compared with reference solutions obtained by finite element simulations.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2023)
Article
Multidisciplinary Sciences
Marcela Areyano, Eric Valois, Ismael Sanchez Carvajal, Ivan Rajkovic, William R. Wonderly, Attila Kossa, Robert M. McMeeking, J. Herbert Waite
Summary: Mussels use byssal threads to secure themselves to rocks and withstand cyclic loading from wave motion. Researchers have discovered that the viscoelastic behavior of the threads is crucial for their ability to withstand these loads, with silk-like domains playing a key role. Damage to these domains leads to a significant decrease in stress relaxation and molecular spacing.
JOURNAL OF THE ROYAL SOCIETY INTERFACE
(2022)
Article
Physics, Multidisciplinary
Muhammad Imran Asjad, Abdul Basit, Azhar Iqbal, Nehad Ali Shah
Summary: This study quantitatively analyzes the convective flow of Maxwell fluid along an upright heated plate using a mathematical model based on Prabhakar-like energy transport. The governing equations are obtained through the Prabhakar fractional derivative. The model's solutions under various conditions are discussed, and the heat transfer and fluid parameters are analyzed and compared.
Article
Engineering, Multidisciplinary
Xianglong Su, Donggang Yao, Wenxiang Xu
Summary: In this study, a new MFM model is proposed to fit linear viscoelastic data, showing improved performance in data fitting and interconversion with fewer fitting modes required. Additionally, the MFM model is capable of adjusting the transient region between the power-law and plateau regions.
INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE
(2021)
Article
Multidisciplinary Sciences
Sehra Sehra, Afshan Noor, Sami Ul Haq, Saeed Ullah Jan, Ilyas Khan, Abdullah Mohamed
Summary: The aim of this research is to apply the Caputo-Fabrizio fractional derivative to the heat transformation of unsteady incompressible second grade fluid, and analyze the effects of magneto hydro dynamic and radiation. Nonlinear radiative heat is examined in the governing equation of heat transfer. Exact analytical solutions are obtained for dimensionless fractional governing equations using Laplace transform method. Special cases are investigated and well-known results are achieved from these special cases. Finally, the influences of different physical parameters are checked graphically for illustration.
SCIENTIFIC REPORTS
(2023)
Article
Mechanics
R. K. Praharaj, N. Datta
Summary: This study presents the dynamic response spectra of fractionally damped viscoelastic beams subjected to concentrated moving load, highlighting the importance of the fractional-order damping model in the dynamics of viscoelastic structures. The study investigates the effect of different orders of fractional derivative damping on the beams and compares them with the results obtained from the integer-order damping model. The results show that an increase in the order of the fractional derivative leads to an increase in system damping and a decrease in the dynamic amplification factor.
MECHANICS BASED DESIGN OF STRUCTURES AND MACHINES
(2022)
Article
Instruments & Instrumentation
Timi Karner, Janez Gotlih
Summary: This study focuses on the creep behavior of dielectric elastomer actuators (DEAs) in the first few excitation cycles. By comparing different constitutive models, the fractional SLM model was found to be the most suitable for describing the time-dependent deformation of DEAs under sinusoidal excitation. Optimization of constitutive parameters using Matlab provides a foundation for simulating control algorithms for DEAs or similar soft actuators.
SMART MATERIALS AND STRUCTURES
(2021)
Article
Mathematics, Applied
Federico Bernini, Bartosz Bieganowski
Summary: We present a linking-type result that allows us to study strongly indefinite problems with sign-changing nonlinearities. We apply this abstract theory to the singular Schrodinger equation and also obtain the existence of solutions to the nonlinear curl-curl problem.
CALCULUS OF VARIATIONS AND PARTIAL DIFFERENTIAL EQUATIONS
(2022)
Article
Mathematics, Applied
Pawel Labedzki, Rafal Pawlikowski
Summary: This article discusses research on fractional-order differential calculus and the analysis of fractional oscillators, exploring the relationships between fractional oscillators and classical oscillators, and proposing a method for calculating the coefficients of fractional oscillator equations.
COMMUNICATIONS IN NONLINEAR SCIENCE AND NUMERICAL SIMULATION
(2023)
Article
Polymer Science
Anna Stankiewicz
Summary: The goal of this paper is to study the applicability of the relaxation spectrum of the fractional Maxwell model (FMM) to the description of the relaxation spectra of polymers. Analytical formulas for the relaxation time and frequency spectra of the FMM model were derived, and the monotonicity and asymptotic properties of the spectra were analyzed. The existence of local extrema of the relaxation spectra was examined and a simple procedure for checking their existence or absence was developed. The applicability of the continuous-discrete spectrum of FMM to describe commonly used relaxation spectra in rheology was also investigated.
Article
Materials Science, Paper & Wood
Wenbin Guo, Fan Hu, Xuehong De, Zhibo Hou, Zhipeng Wang, Xinyang Jiang
Summary: Studying the stress relaxation characteristics can provide important process parameters for the granulation and briquetting of biomass materials. In this study, a model was established to describe and analyze the stress instantaneous drop behavior and obtain the stress relaxation characteristic parameters. The influence of compression speed on the parameters was analyzed.
Article
Mechanics
R. K. Praharaj, N. Datta
Summary: The study investigates the dynamic behavior of thin plates resting on a fractionally damped viscoelastic foundation subjected to a moving point load. Results show that the damping of the foundation system increases with the order of the fractional derivative, leading to a decrease in the dynamic response.
MECHANICS BASED DESIGN OF STRUCTURES AND MACHINES
(2022)
Article
Engineering, Multidisciplinary
Prabakaran Balasubramanian, Vikram Kaushik, Sumaya Y. Altamimi, Marco Amabili, Mohamed Alteneiji
Summary: This study compares the accuracy and robustness of three neural networks in estimating impact location. The results show that Artificial Neural Network (ANN) provides the best accuracy, while Convolutional Neural Network (CNN) is more robust in the presence of noise.
STRUCTURAL HEALTH MONITORING-AN INTERNATIONAL JOURNAL
(2023)
Article
Engineering, Multidisciplinary
Moaz Sibtain, Kelly Yee, Oscar Zi Shao Ong, Mergen H. Ghayesh, Marco Amabili
Summary: This study investigates the coupled dynamics of a multi-layered microbeam with size-dependent effects. It is found that increasing the power term constant of the material grading or the value of the localized mass imperfection leads to a decrease in the natural frequencies of the microbeam, while increasing the length-scale parameter results in an increase in the natural frequencies of transverse modes.
ENGINEERING ANALYSIS WITH BOUNDARY ELEMENTS
(2023)
Article
Mechanics
Amit Yadav, Marco Amabili, Sarat Kumar Panda, Tanish Dey
Summary: This paper presents the dynamic instability and nonlinear vibration analysis of fluid-filled laminated composite circular cylindrical shells subjected to harmonic axial loading. The mathematical model is prepared using higher-order shear deformation theory, and the nonlinear responses are computed using the pseudo-arclength continuation method and the incremental harmonic balance method.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2023)
Review
Mechanics
Hossein B. Khaniki, Mergen H. Ghayesh, Rey Chin, Marco Amabili
Summary: Soft structures have the ability to undergo reversible large strains and deformations under different types of loadings. Nonlinear elastic models have been developed to accurately model these large deformations and strains, as linear elastic models have their limitations. Among these models, hyperelastic strain energy density models provide a good fit for the mechanical behavior of biological tissues. With advancements in biomechanical devices, it is important to review the latest works in this field, as in-vivo and in-vitro studies have significantly increased in the past few years. Additionally, accurate modeling of soft structures is crucial for various applications such as prosthetics, soft robots, and wearing devices.
INTERNATIONAL JOURNAL OF NON-LINEAR MECHANICS
(2023)
Article
Engineering, Biomedical
Ivan D. Breslavsky, Marco Amabili
Summary: The authors found that a stress-strain curve for uniaxial tension of an aortic intact wall cannot be obtained by combining the strain energy functions of the three individual aortic layers. However, it is possible to fit the intact wall experimental curves with the combination of the strain energy functions of the three individual layers if residual strains are added. By varying these parameters, it is possible to find a solution with the combined responses of the individual layers matching the experimental stress-strain curves of the intact wall.
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Stanislas Le Guisquet, Marco Amabili
Summary: This study characterizes the viscoelastic properties of a hydrogel in sol-gel transition by measuring the vibration response of a rigid circular cylindrical container's bottom silicone membrane. A finite-element numerical model was built for identification of the hydrogel's storage shear modulus and loss tangent. It was found that membrane vibration can be used to characterize the viscoelastic mechanical properties of a hydrogel in sol-gel transition in a more versatile way.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2023)
Article
Engineering, Mechanical
Iman Gholami, Marco Amabili, Michael P. Paidoussis
Summary: This experimental study analyzes the dynamics and stability of soft cantilevered circular cylindrical shells under subsonic internal airflow with different length-to-radius (L/R) ratios. The results reveal that the system experiences a strongly subcritical bifurcation and loses stability by flutter. Longer shells lose stability at lower flow velocities, and increasing the flow velocity beyond the critical value leads to more irregular oscillations, implying the presence of a chaotic component. The chaotic component is influenced by the L/R ratio. The study also investigates the influence of the outflow jet on system stability by adding a flat horizontal plate at varying distances over the free end of the shell. It is observed that changing the outflow jet direction from axial to radial not only stabilizes the system but also reduces the chaotic behavior of the oscillations.
NONLINEAR DYNAMICS
(2023)
Article
Engineering, Biomedical
Francesco Giovanniello, Meisam Asgari, Ivan D. Breslavsky, Giulio Franchini, Gerhard A. Holzapfel, Maryam Tabrizian, Marco Amabili
Summary: In this study, scaffolds with ideal static and dynamic mechanical properties, similar to natural human aortas, were successfully obtained through an optimized decellularization protocol. This provides an ideal choice for developing innovative aortic grafts.
ACTA BIOMATERIALIA
(2023)
Article
Engineering, Mechanical
Marco Amabili
Summary: This study investigates whether it is necessary to satisfy the natural boundary conditions in nonlinear vibrations of rectangular plates. Accurate expansions of plate displacements and nonlinear damping are introduced to satisfy the natural boundary conditions by energy minimization and achieve results that agree with experiments.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2023)
Article
Engineering, Mechanical
Prabakaran Balasubramanian, Giovanni Ferrari, Celia Hameury, Tarcisio M. P. Silva, Abdulaziz Buabdulla, Marco Amabili
Summary: Positive Position Feedback (PPF) is a leading algorithm for actively suppressing mechanical vibrations in thin-walled structures. This study proposes a method for estimating participation matrices based on experimental measurements, simplifying the design of PPF controls and eliminating the need for electromechanical modeling. This opens up possibilities for the widespread use of Active Vibration Control (AVC) techniques.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2023)
Article
Engineering, Mechanical
Flavio Augusto Xavier Carneiro Pinho, Marco Amabili, Zenon Jose Guzman Nunez Del Prado, Frederico Martins Alves da Silva
Summary: This work applies Sanders-Koiter's nonlinear shell theory to study the nonlinear moderate-amplitude vibrations of doubly curved shells. The nonlinear equations of motion are determined using two different approximations of the strain-displacement relations for shallow and non-shallow shells. The backbone curves are obtained using a combination of the multiple shooting method and an Euler-Newtonian predictor-corrector continuation algorithm. The mode influence of selected points on the backbone curves is analyzed, revealing internal resonances and changes in the dynamic behavior of shells undergoing moderate-amplitude vibrations.
NONLINEAR DYNAMICS
(2023)
Article
Engineering, Mechanical
Brian Painter, Marco Amabili
Summary: In this study, the non-planar vibration response of a beam with initial geometric imperfections is investigated using a geometrically nonlinear beam model. The experimental data shows good agreement with the beam model response around the resonant frequency of the first bending mode.
NONLINEAR DYNAMICS
(2023)
Article
Engineering, Civil
B. Kh. Eshmatov, R. A. Abdikarimov, M. Amabili, N. I. Vatin
Summary: This work focuses on the study of an anisotropic viscoelastic fiber-reinforced simply supported rectangular plate. By considering the direction of the fibers, the dynamic behavior of the plate and the dynamic stability problem of anisotropic reinforced plates were investigated. The results highlight the importance of considering the viscoelastic properties of the material when solving dynamic problems of anisotropic reinforced plates made of composite materials.
MAGAZINE OF CIVIL ENGINEERING
(2023)
Article
Acoustics
M. Amabili, H. R. Moghaddasi
Summary: Studies on nonlinear vibrations of circular cylindrical shells containing fluid have focused mostly on thin simply supported shells, leaving a lack of research on the behavior of thick cantilevered shells with shear and thickness deformations. This article presents, for the first time, models of thin and thick circular cylindrical shells with clamped-free boundary conditions based on the third-order shear deformation theory with thickness stretch. The derived governing differential equations describe the shell-fluid interaction. Results show that increasing the fluid level and decreasing the shell thickness in linear free vibration analysis significantly raise the fluid free-surface wave elevation, limiting the application of linear sloshing theory. The presence of the fluid changes the nonlinear behavior from softening to hardening, and intensifies the shell thickness deformation. Additionally, the contained liquid reduces the circumferential dynamic contraction caused by large amplitude vibrations.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Engineering, Biomedical
Marco Amabili, Giulio Franchini, Meisam Asgari, Francesco Giovanniello, Mergen H. Ghayesh, Ivan D. Breslavsky
Summary: This study investigated the mechanical characteristics of an aorta affected by Klippel-Trenaunay syndrome. The results showed reduced stiffness and decreased response to vasoactive agents in the circumferential direction.
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
(2023)
Article
Engineering, Biomedical
Xinyao Zhu, Yifan Liu, Jing Ye, Wei Xu, Xuexia Zhao, Tianyan Liu
Summary: This study reveals the adverse effect of acid on dentin in terms of degradation of its fracture toughness. The peritubular dentin plays a significant role in enhancing the dentin's fracture resistance capability. The findings highlight the importance of structural integrity for dentin.
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
(2024)
Article
Engineering, Biomedical
Priya Ranganathan, Vijayakumari Sugumaran, Bargavi Purushothaman, Ajay Rakkesh Rajendran, Balakumar Subramanian
Summary: The study aims to design and fabricate an ultra-easier multi-functional biomedical polymeric scaffold loaded with unique equimolar Ca:P phasic bioactive glass material. The results showed that the G:BG (1:2) ratio is the more appropriate composition for enhanced bio-mineralization and higher surface area. The scaffold can induce mitogenesis in osteoblast cells for hard tissue regeneration and rapid collagen secretion in fibroblast cells for soft tissue regeneration.
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
(2024)
Article
Engineering, Biomedical
Ziad Guerfi, Oum keltoum Kribaa, Hanane Djouama
Summary: Hydroxyapatite, a biocompatible and bioactive ceramic material, has been widely studied in fields such as orthopedics and plastic surgery. The use of computational tools, especially density functional theory, has become increasingly important in research. In this study, Hydroxyapatite was synthesized using the double decomposition method and quantum mechanical computations were performed using density functional theory. The experimental and computational results confirmed the successful synthesis of Hydroxyapatite and showed good agreement in spectroscopic characterizations.
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
(2024)
Article
Engineering, Biomedical
Sally AbdulHussain Kadhum, Nassier A. Nassir
Summary: In this research, porous composites were successfully prepared and reinforced for bone scaffold applications. The functional groups, pore structure, and composition distribution of the materials were characterized using techniques such as FTIR, Atomic Force Microscopy (AFM), and Scanning Electron Microscopy (SEM).
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
(2024)
Article
Engineering, Biomedical
Veronika Geiger, Felicitas Mayinger, Moritz Hoffmann, Marcel Reymus, Bogna Stawarczyk
Summary: The study investigated the mechanical properties of four additively manufactured denture base resins in different measurement environments, and found that the measurement environment impacts the strength and fracture toughness of the materials.
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
(2024)
Article
Engineering, Biomedical
Junxiao Wang, Amatjan Sawut, Rena Simayi, Huijun Song, Xueying Jiao
Summary: The development of cost-effective and eco-friendly conductive hydrogels with excellent mechanical properties, self-healing capabilities, and non-toxicity is of great significance in the field of biosensors.
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
(2024)
Article
Engineering, Biomedical
Yijun Zhou, Lisa Ho, Ayan Samanta, Philip Procter, Cecilia Persson
Summary: In this study, soft, non-setting biomaterials based on Hyalectin gels and different morphological parameters of hydroxyapatite (HA) particles were evaluated as potential augmentation materials for orthopaedic implant fixation. The results showed that constructs reinforced with irregularly shaped nano-HA particles and spherically shaped micro-HA particles had significantly higher pull-out force compared to the control group.
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
(2024)
Article
Engineering, Biomedical
Mehdi Jahandardoost, Donald Ricci, Abbas S. Milani, Mohsen Jahandardoost, Dana Grecov
Summary: Tubular flow diverters are important for treating cerebral aneurysms. A new design called VR-eCLIPs has been developed to cover the neck of challenging bifurcation aneurysms. A finite element model has been used to simulate the implantation processes of VR-eCLIPs and assess potential plastic deformation.
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
(2024)
Article
Engineering, Biomedical
Marek Traczynski, Adam Patalas, Katarzyna Roslan, Marcin Suszynski, Rafa l Talar
Summary: This article evaluates the forces acting on intravenous needles during insertion into the skin and selects the most suitable model for future research. The experimental results show that needle size, insertion angle, and insertion speed have an influence on the measured force values.
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
(2024)
Article
Engineering, Biomedical
Chester Jar, Andrew Archibald, Monica Gibson, Lindsey Westover
Summary: This study evaluates the ASIST technique for assessing the stability of dental implants. The results show that the ASIST technique can reliably measure the interfacial stiffness of dental implants, which is not significantly influenced by different abutment types. This method may provide an improved non-invasive way to measure the stability of dental implants.
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
(2024)
Article
Engineering, Biomedical
Ali Kamali, Kaveh Laksari
Summary: In this paper, a UNet-based neural network model (El-UNet) is developed to infer the spatial distributions of mechanical parameters. The El-UNet shows superior performance in terms of accuracy and computational cost compared to other neural network models. A self-adaptive spatial loss weighting approach is proposed, which achieves the most accurate reconstructions in equal computation times.
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
(2024)
Article
Engineering, Biomedical
Chunyan Yu, Yanju Lu, Jinhui Pang, Lu Li
Summary: In this study, a safe and effective hemostatic composite sponge was developed by combining chitosan and hydroxypropylmethylcellulose (HPMC). The sponge exhibited excellent flexibility and rapid hemostatic ability in vitro. In vivo assessments showed that the sponge had the shortest clotting time and minimal blood loss.
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
(2024)
Article
Engineering, Biomedical
Zhongliang Yu, Lin Yu, Junjie Liu
Summary: The study proposes incorporating functionally graded tablets into nacreous composites to enhance both stiffness and damping properties. Analytical formulae and numerical experiments demonstrate the effectiveness of this design, surpassing existing homogeneous composites in performance.
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
(2024)
Article
Engineering, Biomedical
Marc Graham, Sandra Klinge
Summary: This study investigates the macroscopic diffusion behavior of heterogeneous gels using a homogenization method in a finite element framework. Two materials, calcifying PDMA and PAAm, were studied, and the results show that the diffusivity of PDMA has a strong nonlinear dependence on the solute molecule radius.
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
(2024)
Article
Engineering, Biomedical
Abdur-Rasheed Alao
Summary: This study aimed to find the optimal sandblasting parameters for roughening YTZP surfaces. Through experimental and statistical analysis, the best setting was found to be IA = 45 degrees, AP = 110 μm, ST = 20 s, and P = 400 kPa, which resulted in the maximum surface roughness, phase transformation, and shear bond strength.
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
(2024)
