Article
Engineering, Mechanical
J. Garzon, C. S. Ramos, M. H. C. Bento, S. P. B. Proenca, C. A. Duarte
Summary: This paper presents a methodology for efficient analysis of 3-D fracture mechanics problems in linear viscoelastic media. The method combines the Elastic-Viscoelastic Correspondence Principle (EVCP), a Generalized Finite Element Method (GFEM), and an inverse Laplace transform (ILT) to compute Energy Release Rate (ERR) and Crack Mouth Opening Displacement (CMOD) for viscoelastic fracture problems in the time domain. The proposed method, EVCP-GFEM-ILT, requires only a single elastic solution regardless of the time interval of the target viscoelastic problem. Verification against analytical and reference numerical solutions is performed, and the computational cost is compared with a commercial software. The applicability of the proposed methodology is demonstrated through solving a fully 3-D mixed-mode fracture problem with a non-trivial viscoelastic material model, as well as a large-scale practical simulation problem.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2023)
Article
Mathematics, Applied
Kotaro Miura, Chihiro Oyama, Makoto Sakamoto, Yuji Tanabe
Summary: This study utilized relaxation indentation tests and analytical solutions to evaluate the viscoelastic parameters of different materials, finding that the five-element model is more suitable for describing the materials' relaxation behavior. Additionally, the viscoelastic parameters of treated articular cartilage significantly decreased, providing a tool for assessing cartilage degeneration.
ZAMM-ZEITSCHRIFT FUR ANGEWANDTE MATHEMATIK UND MECHANIK
(2021)
Article
Engineering, Geological
Priti Maheshwari
Summary: This research revisited the challenges of underground excavations in laminated rocks, exploring the interesting possibilities of connection and detachment among roof layers using elastic-viscoelastic correspondence principle. The study found that beams represented by different models showed varying attachment behaviors during long-term simulations, providing valuable insights for similar engineering projects.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2021)
Article
Mechanics
Jan Sladek, Vladimir Sladek, Xinpeng Tian, Qian Deng
Summary: The correspondence principle is applied to solve general 2-D electro-viscoelastic problems with the flexoelectric effect, using a mixed finite element method. Competitive characteristics of strengthening and softening in micro/nano-sized structures are considered. The standard finite element method cannot be directly applied due to higher order derivatives, hence a mixed FEM approach is developed and successfully demonstrated through example problems.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2022)
Article
Materials Science, Multidisciplinary
Alexander Dumansky, Elizaveta Klyatskina, Mukhamiat Alimov, Francisco Segovia, Alejandro Sanchez
Summary: This research proposes a modeling of time-dependent properties of unidirectional fiber reinforced plastics based on the structural mechanics of composite materials and mechanics of hereditary media. The constitutive equations of unidirectional fiber reinforced plastics have been derived using the Volterra correspondence principle and the algebraic properties of resolvent operators. Additionally, modeling of viscoelastic properties of a unidirectional composite material based on EDT-10 epoxy resin has been demonstrated.
Article
Materials Science, Multidisciplinary
Zhelong He, Marek-Jerzy Pindera
Summary: The recently developed elasticity-based locally exact asymptotic homogenization theory is extended to accommodate non-ageing linearly viscoelastic composites under anti-plane shear loading. The effectiveness of the theory is assessed through numerical examples and comparison with finite element method, showcasing good accuracy. The analytical solution methodology in the Laplace domain is unique and serves as a gold standard for validating numerical approaches in solving viscoelastic composite structural problems.
MECHANICS OF MATERIALS
(2021)
Article
Mechanics
Shaoqiang Yao, Hui Cai, Aizhong Lu
Summary: In this study, a viscoelastic analytical solution for the axial forces of a deeply buried circular tunnel supported with point-anchored rock bolts was presented. The solution process considered the surrounding rock as both an elastic and a viscoelastic material. The results were compared with numerical methods and the effects of various factors on the axial forces of the rock bolts were discussed.
INTERNATIONAL JOURNAL OF APPLIED MECHANICS
(2023)
Article
Chemistry, Multidisciplinary
Bingcheng Huang, Aizhong Lu, Ning Zhang
Summary: A solution is proposed for ground surface settlement induced by distributed loads in fractional-generalised Kelvin semi-infinite space using fractional differential theory. The effects of four main parameters on the settlements are analysed, and a parametric-sensitivity analysis is conducted. The results show that the fractional-order generalised Kelvin model is more flexible and sensitive than the conventional integer-order model, and it can accurately describe the rock's rheological behaviour.
APPLIED SCIENCES-BASEL
(2023)
Article
Engineering, Multidisciplinary
Yezeng Huang, Guannan Wang, Leiting Dong, Satya N. Atluri
Summary: This article investigates the viscoelastic behavior of polymer-based heterogeneous materials using 3D viscoelastic computational grains with spherical inclusions, with and without interphases/coatings. Various models are used to describe the properties of viscoelastic polymers, and the generated results are validated against experimental data and other models.
INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING
(2021)
Article
Materials Science, Multidisciplinary
Zhongya Lin, Zhijie Yu, Yueguang Wei, Yanfei Wang
Summary: The paper presents a strain gradient viscoelastic solution for a pressurized thick spherical shell cell, capturing the hardening and softening effects of materials through a gradient parameter and higher-order viscoelastic model. The behavior at micro-/nano-scale and the Hall-Petch character can be explained using this model. The stiffness of the pressurized spherical shell is discussed in relation to material parameters with both time and scales.
MECHANICS OF MATERIALS
(2021)
Article
Polymer Science
Junzhe Lou, Yan Xia
Summary: In this study, we introduce a new strategy to reversibly tune the stiffness and stress-relaxation of hydrazone-crosslinked hydrogels by incorporating a small-molecule competitor. By adjusting the cross-linking density, the mechanical properties of hydrogels can be altered, which has potential applications in cell delivery to improve cell viability during injection.
Article
Engineering, Biomedical
Sarah-Jane Estermann, Dieter H. Pahr, Andreas Reisinger
Summary: This study proposes a strategy for designing material microstructures to mimic soft tissue viscoelastic behavior based on a micromechanical Mori-Tanaka model. The validation of the model shows good agreement with experimental results for low inclusion volume fractions, but underestimates the complex modulus for high fractions.
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
(2022)
Article
Geochemistry & Geophysics
Pengliang Yang, Rune Mittet
Summary: Researchers have developed a fictitious wave-domain high-order finite-difference time-domain (FDTD) modeling method to calculate frequency-domain 3D controlled-source electromagnetic data on nonuniform grids. The method accurately computes finite-difference coefficients adaptive to node spacings by inverting a Vandermonde matrix system using an efficient algorithm. Grid stretching in this method reduces the number of grid points required for discretization, making it more efficient.
Article
Materials Science, Multidisciplinary
Yuri Bazilevs, Masoud Behzadinasab, John T. Foster
Summary: This article summarizes key developments in the field of Peridynamics (PD) and identifies two emerging schools of thought. One school views PD as a traditional nonlocal continuum model, while the other sees it as a discretization methodology for local continua. The article focuses on the latter viewpoint and presents a PD formulation using the M7 Microplane constitutive model, specifically designed for failure analysis of concrete materials. The formulation is validated through extensive classical fracture tests, and an extension of the M7 model for concrete fracture and fragmentation in the PD context is proposed.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2022)
Article
Mechanics
Adil Han Orta, Mathias Kersemans, Koen Van Den Abeele
Summary: This study critically compares various commonly used models for calculating complex wavenumbers in viscoelastic orthotropic multi-layer materials. The accuracy and computational efficiency of these models are analyzed for material characterization. A comparative analysis is also performed on the through thickness displacement fields in the solid medium.
COMPOSITE STRUCTURES
(2022)
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)