Article
Mechanics
Krishna T. Khambhampati, K. R. Rajagopal
Summary: This paper presents a novel approach for developing the FENE-P constitutive relation and its generalizations from a different perspective than previous methods. The thermodynamic framework used in this study has shown to successfully establish constitutive relations in a wide range of areas, which adds credibility to the models obtained.
INTERNATIONAL JOURNAL OF NON-LINEAR MECHANICS
(2021)
Article
Physics, Multidisciplinary
Qidong Fu, Peng Wang, Yaroslav V. Kartashov, Vladimir V. Konotop, Fangwei Ye
Summary: This study investigates the one-dimensional topological pumping of matter waves in two overlaid optical lattices with attractive nonlinearity. It reveals that there is a threshold nonlinearity level where matter transfer completely halts. Below this threshold, both dispersive wave packets and solitons follow the predictions of linear theory, quantized and determined by the linear dynamical Chern numbers of the lowest bands. The breakdown of transport is justified by the nontrivial topology of the bands, where nonlinearity induces Rabi oscillations of atoms between the lowest bands. The direction and magnitude of the average velocity of matter solitons, which remain quantized and allow fractional values, are determined by the sum of the Chern numbers of the nonlinearity-excited bands. The study emphasizes the role of the topology of linear bands in the evolution of solitons, even in the strongly nonlinear regime. The transition between different dynamical regimes is accurately described by perturbation theory for solitons.
PHYSICAL REVIEW LETTERS
(2022)
Article
Engineering, Geological
Antoine B. Jacquey, Klaus Regenauer-Lieb, Mauro Cacace
Summary: Observations show that the mechanical behavior of porous rocks under external loading is influenced by factors such as confining pressure, fluid pressure, and deformation rate. The multiscale and poromechanical behavior of geomaterials is significant for various applications including civil engineering, reservoir engineering, geological, and geodynamic studies. The use of thermodynamic-consistent approaches is important in constructing constitutive laws that cover a wide range of time scales.
ROCK MECHANICS AND ROCK ENGINEERING
(2021)
Article
Engineering, Geological
Antoine B. Jacquey, Klaus Regenauer-Lieb
Summary: The lack of consensus in applying equilibrium thermodynamics in geomechanics and geological applications is due to the non-equilibrium nature of the problems, such as rate-dependence and poromechanical complexity, which prevent the local equilibrium assumption. The extension of the theory of thermomechanics offers a thermodynamic-consistent modeling approach for civil engineering, geological, and geodynamic problems.
ROCK MECHANICS AND ROCK ENGINEERING
(2021)
Article
Engineering, Geological
Thomas A. Vergote, C. F. Leung, S. C. Chian
Summary: The novel elastoviscoplastic model improves the modeling of one-dimensional unloading response of soils, featuring a flexible reference isotache and full hydro-mechanical coupling. Calibration of the model was conducted with laboratory tests involving complex stress paths.
INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS
(2021)
Article
Engineering, Environmental
R. Saagi, M. Arnell, D. Reyes, C. Warff, M. Ahlstrom, U. Jeppsson
Summary: The study compared two models to predict wastewater temperature in Swedish cities, finding that both mechanistic and conceptual models have similar predictive capabilities. The encouraging results suggest the use of conceptual models to decrease data requirements and model calibration efforts. Both models are freely distributed and can be easily integrated into wastewater management systems for analysis of temperature dynamics.
WATER SCIENCE AND TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Antoine B. Jacquey, Hadrien Rattez, Manolis Veveakis
Summary: This study investigates how multiphysics coupling, combined with rate-dependent plasticity, can regularize the problem of strain localization. By coupling constitutive laws for deformation to a generic diffusion-reaction equation, it is possible to regulate this ill-posed problem under certain conditions on softening parameters in the plastic potential. This approach can lead to material instabilities controlled by physical parameters, resulting in the formation of regular or erratic patterns.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2021)
Article
Materials Science, Multidisciplinary
Yu E. Lozovik, I. L. Kurbakov, G. E. Astrakharchik, J. Boronat
Summary: The proposed method provides an accurate estimation of the condensate fraction in strongly correlated systems under various conditions, with experimental measurements confirming its effectiveness.
Article
Engineering, Mechanical
Victor Roda-Casanova, Francisco Sanchez-Marin, Raul Martinez-Cuenca
Summary: Heat convection is a significant factor in the cooling process of polymer spur gears running in dry conditions, affecting the gear strength. A numerical heat convection model is proposed in this study, based on a detailed CFD simulation, to investigate heat convection on the external surfaces of the gears. Parametric studies reveal that the relative differences between the results obtained from this model and a representative classical heat convection model can reach up to 125% in terms of heat transfer coefficients. An optimized heat convection model, using empirical equations derived from Newton's law of cooling, is proposed to improve the accuracy of the classical models while reducing the maximum relative differences to 10%.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Mathematics, Applied
Zhi-Yuan Sun, Xin Yu
Summary: In this paper, we systematically simulate turbulent waves in the focusing NLS equation with dynamical random potentials and study their properties. We observe that enhanced branching structures evolve into branched soliton flows as the nonlinearity increases. Short-lived rogue waves result from the interplay of linear random focusing and modulation instability, while longer-lived rogue waves are due to a self-organization of larger solitons competing with the breakup of intermediate solitons. We also find that strong nonlinearity can significantly increase the width of the linear spectrum but with a suppressed spreading rate depending on the correlation length of the potential.
Article
Chemistry, Physical
Atsuko Jimbo, Kohei Imura
Summary: In this study, the nonlinear photoluminescence from gold nanoparticle films was investigated using scanning near-field optical microscopy. The spatial and spectral distributions of the photoluminescence active sites beyond the diffraction limit of light were visualized. The results show that photoluminescence originates from at least two spectral components, one attributed to electron-hole recombination and the other ascribed to the radiative decay of plasmons.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Engineering, Geological
Dawei Xue, Ghassan Shahin, Xilin Lu, Giuseppe Buscarnera
Summary: This work presents a viscoplastic localization criterion based on the theory of controllability and a viscoplastic description of the mechanical response to detect strain localization in rate-dependent solids. The proposed criteria are illustrated through strain localization analyses of a porous rock and finite element simulations of compression tests. The study shows that the viscoplastic localization criterion maintains a negative sign during unstable behavior and switches to positive during decelerating deformation. The analysis also reveals the emergence of overstress pulses during unstable behavior, matching the transition to stable behavior.
INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS
(2022)
Article
Engineering, Mechanical
Raul Gismeros Moreno, Eduardo Corral Abad, Jesus Meneses Alonso, Maria Jesus Gomez Garcia, Cristina Castejon Sisamon
Summary: This study demonstrates the design, optimization, and verification process of a multiple-impact multibody model, focusing on a pool/billiard game. Contact and friction forces in multiple simultaneous events are critical for consistent results, with different nonlinear models being implemented to identify interactions. Determining the most accurate solving method at minimum computational cost is essential, with verification done using experimental results and previous works.
NONLINEAR DYNAMICS
(2022)
Article
Acoustics
Matteo Brunetti, Andrzej Mitura, Francesco Romeo, Jerzy Warminski
Summary: The nonlinear dynamics of cantilever bistable shells with asymmetric stable configurations and their energy harvesting capabilities are investigated. Experimental and numerical studies are conducted to analyze the resonance scenarios and develop a reduced order model. A double-well quintic oscillator is proposed to capture the observed behavior, and the global dynamics including regular and chaotic regimes are described.
JOURNAL OF SOUND AND VIBRATION
(2022)
Article
Polymer Science
Yongjun Zhang, Xiu Liu, Boyuan Yin, Wenbo Luo
Summary: A nonlinear fractional viscoelastic plastic (NFVEP) creep model was proposed for asphalt mixture under high stresses, showing good agreement with experimental results in predicting the mechanical behavior.
