Article
Engineering, Mechanical
Maoyuan Jiang, Zhengxuan Fan, Serge Kruch, Benoit Devincre
Summary: This study investigates the grain size effect in FCC polycrystalline plasticity using a multiscale modeling approach combining discrete dislocation dynamics (DDD) and crystal plasticity finite element method (CPFEM). The developed model quantitatively reproduces the deformation curves of FCC polycrystals and shows significant potential for further applications.
INTERNATIONAL JOURNAL OF PLASTICITY
(2022)
Article
Engineering, Mechanical
Jianqiu Liu, Minsheng Huang, Zhenhuan Li, Lv Zhao, Yaxin Zhu
Summary: In this study, the growth of microvoids in polycrystals under finite deformation was investigated, revealing significant influences of crystallographic orientation of grains and local heterogeneous polycrystalline microstructure on microvoid growth. Additionally, the size ratio of microvoid to voided grain was found to heavily influence microvoid growth, indicating a strong size effect in heterogeneous polycrystals.
INTERNATIONAL JOURNAL OF PLASTICITY
(2021)
Article
Engineering, Mechanical
Kengo Yoshida
Summary: The crystal-plasticity-based finite element method has been widely studied and applied in the field of sheet-metal forming. A two-grain cluster (TGC) homogenization method has been proposed as an alternative to the fully-constrained Taylor model, with promising results in predicting the behavior of polycrystals. This study further improved the TGC model by developing a fully implicit numerical procedure and applying it to a cup drawing simulation. The results demonstrated that the TGC model, combined with finite element simulation, outperformed the Taylor model in accurately predicting cup height and thickness.
INTERNATIONAL JOURNAL OF PLASTICITY
(2022)
Article
Materials Science, Multidisciplinary
Quanfeng Han, Xin Yi
Summary: As the average grain size decreases, the reduction in intragranular dislocation storage ability is revealed as the underlying mechanism of the breakdown of Hall-Petch behavior in nanocrystalline (NC) metals. The prediction of the critical grain size for the HP-inverse HP transition of NC metals agrees well with experimental results, showing remarkable ductility enhancement in the inverse HP region dominated by harmonized deformation of grain boundaries and grain interior. Additionally, the increase in grain boundary strength leads to enhancement in yield strength and delay in occurrence of the inverse HP behavior in NC metals.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2021)
Article
Materials Science, Multidisciplinary
Maoyuan Jiang, Ghiath Monnet, Benoit Devincre
Summary: The study revealed that the back stress and associated strain hardening are independent of grain size at low strain, while the grain size effect is controlled by increasing the critical resolved shear stress (CRSS) when decreasing grain size. The evolution of the CRSS amplitude is controlled by two competing strengthening mechanisms, justifying the generic 1/d dependent form of the Hall-Petch law observed in simulations and experiments.
Article
Materials Science, Multidisciplinary
Mohsen Taheri Andani, Aaditya Lakshmanan, Veera Sundararaghavan, John Allison, Amit Misra
Summary: This study investigates the micro-Hall-Petch coefficient values for prismatic slip in Mg-4Al alloys and their correlation with grain boundary parameters. The results show that the k(mu)(pr)(ismat)(ic) values vary significantly among different grain boundaries and are larger than the values for basal micro-Hall-Petch. A functional relationship based on two effective angles is proposed to estimate the Hall-Petch barrier for prismatic slip system.
Article
Materials Science, Multidisciplinary
Adnan Eghtesad, John D. Shimanek, Shun -Li Shang, Ricardo Lebensohn, Marko Knezevic, Zi-Kui Liu, Allison M. Beese
Summary: This study successfully integrates first-principles calculations based on density functional theory (DFT) into the dislocation density hardening law of the crystal plasticity fast Fourier transform (CPFFT) model, improving the robustness of the model and reducing the uncertainties in calibrating the macroscopic flow response.
COMPUTATIONAL MATERIALS SCIENCE
(2022)
Article
Nanoscience & Nanotechnology
Yu Wen, Bo Guan, Yunchang Xin, Chenglu Liu, Peidong Wu, Guangjie Huang, Qing Liu
Summary: The solute atom mediated Hall-Petch relations were investigated for Mg-Y, Mg-Al, Mg-Gd, and Mg-Zn alloys at a nominal solute content of 0.35 at.%. It was found that Mg-Y and Mg-Gd exhibited significantly lower Hall-Petch slope (k) values (220 MPa·μm(1/2) and 285 MPa·μm(1/2), respectively) compared to Mg-Al and Mg-Zn (324 MPa·μm(1/2) and 322 MPa·μm(1/2), respectively) under compression along the extrusion direction. The addition of Zn or Al led to a strong basal texture and predominantly basal slip deformation, while the addition of Gd or Y resulted in a weakened texture and activation of both {10 (1) over bar2} twinning and basal slip. This difference in deformation mechanisms contributed to the lower k values in Mg-Y and Mg-Gd alloys.
SCRIPTA MATERIALIA
(2022)
Article
Nanoscience & Nanotechnology
Nguyen Q. Chinh, Daniel Olasz, Anwar Q. Ahmed, Gyorgy Safran, Janos Lendvai, Terence G. Langdon
Summary: Experimental data show that the conventional Hall-Petch relationship is not applicable to metals with submicrometer structures. A new dislocation model is proposed to modify the Hall-Petch relationship and provide a uniform description of grain size strengthening in submicron-structured f.c.c. metals and solid solution alloys.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Mechanics
Oguz Umut Salman, Ioan R. Ionescu
Summary: Recent experiments have shown that the mechanical response of crystals is highly sensitive to quenched disorder in the sample and the crystal orientation. Numerical and theoretical studies on clean crystal pillars suggest that depending on the crystal orientation, a single glide plane or multiple glide planes can be activated, leading to either localized deformation or more uniform deformation. Strain localization can be avoided by introducing inhomogeneities inside the crystal or altering the crystal orientation to activate multiple slip systems.
MECHANICS RESEARCH COMMUNICATIONS
(2021)
Article
Mechanics
Laszlo S. Toth, Sudeep K. Sahoo, Alain Molinari
Summary: In this study, the authors analyze the differences between the macroscopic and grain-level plastic powers in the context of the viscoplastic self-consistent (VPSC) approach. They find that the maximum deviation occurs at a specific value of the interaction parameter. This energy discrepancy is related to the stress and strain heterogeneities in VPSC modelling and has implications for the Taylor factor used to scale stress levels.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2023)
Article
Materials Science, Multidisciplinary
Aldo Marano, Lionel Gelebart, Samuel Forest
Summary: The study investigates the ability of softening strain gradient plasticity to simulate intragranular plastic slip localization modes, proposes a more suitable differentiation operator, and implements and discusses four practical interface conditions. The results show that gradient effects strongly influence the mechanisms of selection between slip and kink banding.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2021)
Article
Crystallography
Mahdieh Shahmardani, Napat Vajragupta, Alexander Hartmaier
Summary: The effective mechanical properties of polycrystals are influenced by single-crystal properties and crystallographic orientation, as well as by crystal plasticity parameters. This study systematically investigates the effect of changes in crystal plasticity parameters on polycrystals' mechanical behavior, filling a gap in understanding the relationship between these parameters. Using a numerical model with 100 grains and a non-local crystal plasticity model, the study provides insights into the correlation between microscopic crystal descriptions and macroscopic polycrystal behavior.
Article
Materials Science, Multidisciplinary
Shuvrangsu Das, Dawei Song, Pedro Ponte Castaneda
Summary: This paper presents a finite-strain homogenization model for porous polycrystals, determining the macroscopic response and field statistics using an iterated second-order homogenization method. The model categorizes the material's response into different regimes based on triaxialities, highlighting the importance of accounting for the interplay between porosity and matrix texture evolution in describing constitutive response.
INTERNATIONAL JOURNAL OF FRACTURE
(2021)
Article
Engineering, Mechanical
C. Huang, B. Gao, N. Zhou, R. Xin, S. Tang, K. Elkhodary
Summary: A parameter-free grain boundary model is proposed in this paper, allowing for effective capture of twin pattern development across polycrystals. The model is applied to experimentally imaged microstructures of Magnesium and Titanium, showing a clear ability to capture the role of grain boundaries in nucleation and patterning of twins. The model demonstrates high spatiotemporal fidelity compared to electron back-scattered diffraction maps.
INTERNATIONAL JOURNAL OF PLASTICITY
(2022)
Article
Materials Science, Multidisciplinary
E. Nieto-Valeiras, J. LLorca
Summary: This study investigated slip transfer at grain boundaries and annealing twin boundaries in polycrystalline Ni using slip trace analysis. The results showed that slip transfer mainly occurred at low-angle regular grain boundaries and a Luster-Morris parameter > 0 . 8 served as the best criterion to assess slip transfer.
Article
Materials Science, Multidisciplinary
Abbas Jamali, Anxin Ma, Javier LLorca
Summary: The deformation and fatigue crack nucleation mechanisms in a textured AZ31B-O Mg alloy were investigated using slip trace analysis and secondary electron microscopy. The results showed that the localization of deformation in different grains led to the nucleation of fatigue cracks along specific slip bands or twin boundaries. Grain boundary cracks were present in all cases but were not critical for fatigue failure. This study provides valuable information for evaluating the influence of microstructural features on the fatigue life of Mg alloys and for simulating their fatigue behavior using fatigue indicator parameters.
Article
Nanoscience & Nanotechnology
Junfeng Cui, Liang Ma, Guoxin Chen, Nan Jiang, Peiling Ke, Yingying Yang, Shiliang Wang, Kazuhito Nishimura, Javier Llorca
Summary: This article reports the abnormal phenomenon that twin boundaries weaken the strength of body-centered cubic (BCC) tungsten. [1-11]-oriented W nanowires with (121) twin planes and free of dislocations were fabricated, and in situ tensile tests were performed. The fracture strength of the twinned W nanowire was found to be 13.7 GPa, 16% lower than that of the single-crystal W nanowire (16.3 GPa). The weakening mechanism was revealed to be the early nucleation of a crack at the intersection of the twin boundary with the surface.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
Maral Sarebanzadeh, Alberto Orozco-Caballero, Javier LLorca
Summary: The transfer of basal-to-basal slip across grain boundaries was studied in weakly-textured pure Mg specimens deformed in tension using slip trace analysis and electron back-scatterer diffraction. Basal slip was the dominant deformation mechanism in most grains, and the transfer/blocking of slip at grain boundaries was examined. The active slip system(s) in the grains were determined by analyzing the rotation of grains caused by plastic slip along the basal slip systems. Additionally, the orientation of grain boundaries was measured to determine the twist angle theta.
Article
Chemistry, Physical
Cristina Madrona, Seungki Hong, Dongju Lee, Julia Garcia-Perez, Jose Manuel Guevara-Vela, Ramon Bernardo Gavito, Anastasiia Mikhalchan, Javier Llorca, Bon-Cheol Ku, Daniel Granados, Jun Yeon Hwang, Juan J. Vilatela
Summary: This work describes macroscopic fibers composed of aligned double-walled carbon nanotubes (DWCNTs) intercalated with bromine. The intercalated structure consists of bromine ions lying inside the interstitial sites between the DWCNTs, forming ordered supramolecular wires. The intercalation greatly increases the electrical conductivity and retains the exceptional mechanical properties of the CNT fiber host.
Article
Materials Science, Multidisciplinary
Wei Shao, Sha Liu, Javier LLorca
Summary: The whole Al-Li phase diagram is accurately predicted from first principles calculations and statistical mechanics, taking into account the effect of configurational and vibrational entropy. The predicted phase diagram shows excellent agreement with the experimental results in terms of stable and metastable phases, phase boundaries, and maximum stability temperature of line compounds. The methodology demonstrates that accurate phase diagrams of technologically important alloys can be obtained from first principles calculations.
COMPUTATIONAL MATERIALS SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Biaobiao Yang, Jun Wang, Yunping Li, Matthew Barnett, Javier LLorca
Summary: A dual-textured Mg-6.5 Zn alloy with limited yield asymmetry is studied. The deformation mechanisms responsible for the behavior are analyzed and it is found that compressive deformation is accommodated by basal slip and extension twinning, while tensile deformation promotes basal and nonbasal slip. The contribution of rotated grains leads to similar values of the yield strength in tension and compression.
Article
Engineering, Mechanical
Mingdi Yu, Yuchi Cui, Jingya Wang, Yiwen Chen, Zhigang Ding, Tao Ying, Javier Llorca, Xiaoqin Zeng
Summary: The presence of Y and Ca in a magnesium-based alloy led to a significant increase in the critical resolved shear stress (CRSS) for different deformation mechanisms, including basal slip, pyramidal slip, and tensile twin nucleation. This change in CRSS altered the dominant deformation mechanisms in polycrystals, replacing tensile twinning with prismatic slip during compressive deformation. The reduction of twinning and the activation of prismatic slip were responsible for the high tensile ductility of the alloy.
INTERNATIONAL JOURNAL OF PLASTICITY
(2023)
Article
Materials Science, Biomaterials
Wahaaj Ali, Monica Echeverry-Rendon, Guillermo Dominguez, Kerstin van Gaalen, Alexander Kopp, Carlos Gonzalez, Javier LLorca
Summary: This study analyzed the corrosion, mechanical degradation, and biological performance of cold-drawn WE43 Mg wires. The results showed that the surface-modified Mg wires by continuous PEO had better corrosion resistance and biocompatibility. In contrast, the non-surface-treated Mg wires had a high corrosion rate, resulting in the loss of strength and ductility and no cell attachment. The PEO process formed a dense oxide layer that suppressed pitting corrosion and improved the strength of the Mg wires, enabling cell attachment.
BIOMATERIALS ADVANCES
(2023)
Article
Materials Science, Multidisciplinary
Meijuan Zhang, Anxin Ma, Javier Llorca
Summary: A numerical strategy is proposed to simulate plastic deformation in Mg alloys, which includes dislocation slip through a crystal plasticity model solved using the finite element method, and twin propagation through a phase field model solved using a fast Fourier transform algorithm. The crystal plasticity and phase field equations are solved using different discretizations of the simulation domain with the same time step. The strategy is used to simulate the compression deformation of a Mg micro-pillar and successfully predicts the stress-strain curve and dominant deformation mechanisms, demonstrating the capability of explicitly considering twin propagation in the simulation of plastic deformation in Mg alloys. Furthermore, a simulation of slip/twin interaction in polycrystals is presented to showcase the model's capabilities.
MECHANICS OF MATERIALS
(2023)
Article
Engineering, Biomedical
Sasa Kovacevic, Wahaaj Ali, Emilio Martinez-Paneda, Javier LLorca
Summary: A phase-field model is developed to simulate the corrosion of Mg alloys in body fluids, capturing both uniform and pitting corrosion. The model takes into account the synergistic effect of aggressive environments and mechanical loading in accelerating corrosion kinetics. It has the potential to assess the service life and optimize the design of Mg-based biomedical devices, promoting the development of Mg alloys as biodegradable implant materials.
ACTA BIOMATERIALIA
(2023)
Article
Materials Science, Multidisciplinary
Wei Shao, Jose Manuel Guevara-Vela, Antonio Fernandez-Caballero, Sha Liu, Javier LLorca
Summary: The solid-state region of the Ni-Al phase diagram is predicted accurately by combining first-principles calculations and Monte Carlo simulations. The computed phase diagram agrees well with the experimental phase diagram and provides additional information about the phase boundary between AlNi3 and Ni below 300 K. The study also analyzes the individual contributions of vibrational entropy and magnetic effects to the stability and solubility of different phases.
Article
Polymer Science
Yu-Yao Liu, Juan Pedro Fernandez Blazquez, Guang-Zhong Yin, De-Yi Wang, Javier Llorca, Monica Echeverry-Rendon
Summary: This study presents a strategy for manufacturing biodegradable and biocompatible 3D printable biomaterials with tunable mechanical properties and degradation rate for tissue regeneration scaffolds. The PCEC copolymers synthesized in this study showed tunable mechanical properties and degradation rate, as well as excellent cytocompatibility and cell attachment. It was also demonstrated that PCEC scaffolds with excellent dimensional accuracy and controlled microporosity can be manufactured using 3D printing.
EUROPEAN POLYMER JOURNAL
(2023)
Article
Nanoscience & Nanotechnology
Biaobiao Yang, Jun Wang, Yunping Li, Matthew Barnett, Javier LLorca
Summary: The transformation from compression twins (CT) to double twins (DT) was studied in a dual-textured Mg-6.5%Zn(wt.) alloy during deformation along the extrusion axis. After 7.3% compression, 85% of CT transformed to DT. However, during tension, the transformation ratio dropped to 22% and 36% despite higher applied stresses and strains. The differences in DT activity could not be explained by the Schmid factor, indicating that the activation of non-basal slip plays a role in suppressing the CT to DT transformation.
SCRIPTA MATERIALIA
(2023)
Article
Materials Science, Multidisciplinary
Wahaaj Ali, Monica Echeverry-Rendon, Alexander Kopp, Carlos Gonzalez, Javier LLorca
Summary: The mechanical behavior, corrosion mechanisms, and cytocompatibility of magnesium wires reinforced poly-lactic acid polymer composites were investigated through a 180-day in vitro degradation study. Plasma-electrolytic oxidation surface modification of Mg wires improved the interface shear strength from 10.9 MPa to 26.3 MPa, but decreased to 8 MPa and 13.6 MPa in Mg/PLA and PEO-Mg/PLA composites after 42 days degradation. The cross-sections of the composites exhibited good cytocompatibility, with cells tending to migrate towards the PLA regions and avoiding the surface of the Mg wires. The corrosion rate of surface-modified Mg wires was significantly reduced, with only 3% mass loss after 180 days.
NPJ MATERIALS DEGRADATION
(2023)
Article
Mechanics
Alireza Enferadi, Majid Baniassadi, Mostafa Baghani
Summary: This study presents the design and analysis of an SMP microvalve, where the thermomechanical response of the SMP is investigated using a nonlinear constitutive model that incorporates hyperelasticity and viscoelasticity. The model accounts for fluid-solid interaction and heat transfer in both fluid and solid physics. Numerical simulations are carried out to examine the important characteristics of the SMP valve. The results demonstrate the significance of employing fluid-solid interaction conjugated heat transfer analysis for the efficient development of microvalves in diverse applications.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2024)
Article
Mechanics
Hridya P. Lal, B. R. Abhiram, Debraj Ghosh
Summary: Higher-order elasticity theories are used to model mechanics at the nanoscale, but the length-scale parameters in these theories need to be evaluated through experiments or MD simulations. This study shows that the length-scale parameter in the modified strain gradient theory varies with dimensions, boundary conditions, and deformation level for carbon and boron nitride nanotubes. To address this issue, a supervised ML-based framework is developed, combining MD simulations, continuum formulation, and ML to predict the length-scale parameter for a given material, dimension, and boundary condition. This predictive tool reduces the need for expensive MD simulations and opens up possibilities for applying non-classical continuum theories to nanoscale mechanics problems.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2024)
Article
Mechanics
Geng Chen, Shengzhen Xin, Lele Zhang, Min Chen, Christian Gebhardt
Summary: This paper develops a multiscale numerical approach to predict the failure probability of additive manufacturing (AM) structures subjected to time-varied loadings. The approach combines statistical homogenization, shakedown analyses, and reliability methods to consider the influence of microstructural features on load bearing capacity. Through case studies on exemplary structures and different material randomness assumptions, the robustness of the results is confirmed and the mechanism of how micropores influence structural reliability is explained.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2024)
Article
Mechanics
Guillaume Cadet, Manuel Paredes
Summary: This study proposes a comprehensive solution for calculating the stress field on the surface of a curved beam with a circular cross section, which is crucial for probabilistic fatigue life analysis.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2024)
Article
Mechanics
Hongshi Ruan, Xiaozhe Ju, Junjun Chen, Lihua Liang, Yangjian Xu
Summary: This paper proposes a data-driven approach to improve the efficiency of computational homogenization for nonlinear hyperelastic materials. By combining clustering analysis, Proper Orthogonal Decomposition (POD), and efficient sampling, a reduced order model is established to accurately predict elastoplasticity under monotonic loadings. The numerical results show a significant acceleration factor compared to a purely POD-based model, which greatly improves the applicability for structural analysis.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2024)
Article
Mechanics
Pep Espanol, Mark Thachuk, J. A. de la Torre
Summary: The motion of a rigid body, described by Euler's equations in Classical Mechanics, assumes that the distances between constituent particles are fixed. However, real bodies cannot meet this assumption due to thermal fluctuations. In order to incorporate dissipative and thermal fluctuation effects into the description, a generalization of Euler's equations is proposed. This theory explains the origin of these effects as internal, rather than caused by an external thermal bath, and derives the stochastic differential equations governing the body's orientation and central moments.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2024)
Article
Mechanics
Prateek Chandrakar, Narayan Sharma, Dipak Kumar Maiti
Summary: The current study focuses on the deterioration in thermal buckling performance of variable angle tow laminated (VATL) plates caused by damages in various composite and damage characteristics. Through numerical simulations and surrogate models, it was found that damages reduce the sensitivity of composite properties to buckling response, and a distinctive pattern of buckling response was observed when composite properties vary.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2024)
Article
Mechanics
Liangteng Guo, Shaoyu Zhao, Jie Yang, Sritawat Kitipornchai
Summary: This study introduces composites reinforced with graphene origami nanofillers into functionally graded multilayered phononic crystals. Numerical investigations reveal that these materials possess negative Poisson's ratio and offer unique mechanical properties, which can be tuned by adjusting the weight fraction and hydrogen coverage of the graphene fillers.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2024)
Article
Mechanics
Kai Li, Haiyang Wu, Yufeng Liu, Yuntong Dai, Yong Yu
Summary: This paper presents a novel self-oscillating liquid crystal elastomer fiber-beam system that can sway continuously and periodically under steady illumination. The governing equations of the system are established and the self-swaying process and motion mechanism are described in detail. Numerical results show the system undergoes supercritical Hopf bifurcation and the effects of system parameters on the self-swaying amplitude and frequency are discussed quantitatively.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2024)
Article
Mechanics
Lingkang Zhao, Peijun Wei, Yueqiu Li
Summary: This paper proposes a spatial-temporal fractional order model to study the dynamic behavior of thermoelastic nanoplates in a thermal environment. The model provides a flexible approach to describe the small-scale effects and complex history-dependent effects. Analytical and numerical methods verify the reliability of the model, and the effects of parameters on the dynamic response are discussed.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2024)
Article
Mechanics
A. N. O'Connor, P. G. Mongan, N. P. O'Dowd
Summary: This research presents an autonomous framework that combines Bayesian optimization and finite element analysis to identify ductile damage model parameters. The framework has been successfully applied to P91 material datasets and demonstrates the impact of algorithm hyperparameters on the resulting non-unique ductile damage parameters.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2024)
Article
Mechanics
S. V. Sorokin, S. Lenci
Summary: This paper reconsiders the nonlinear coupling between flexural and longitudinal vibrations of ideally straight elastic beams, using a nonlinear theory of curved beams and employing class-consistent boundary conditions. A paradoxical difference in the nonlinear parts of the Duffing equations obtained in the limit of vanishing curvature and in the case of an ideally straight beam is demonstrated and explained.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2024)
Article
Mechanics
C. Hari Manoj Simha
Summary: Dynamic Mode Decomposition (DMD) can be used to construct deformation fields for linear solids without making constitutive assumptions or knowing material properties. It operates on time-shifted data matrices and selects dominant modes using singular value decomposition. DMD can be used for reconstructing displacement states in elastic solids and identifying the onset of plasticity in elastic-plastic solids.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2024)
Article
Mechanics
C. Ren, K. F. Wang, B. L. Wang
Summary: An electromechanical model is established to investigate the characteristics of a bilayer structure consisting of a piezoelectric semiconductor film and an elastic substrate. The combined effects of piezoelectricity and flexoelectricity are considered, and closed-form expressions for the distributions of electron concentrations and relevant electromechanical fields are obtained. The effects of interfacial parameter, flexoelectricity, and initial carrier concentration are discussed. The research highlights the importance of the interfacial parameter and the weakening effect of flexoelectricity on the imperfect interface of the bilayer system.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2024)
Article
Mechanics
Yu Sun, Qiang Han, Chunlei Li
Summary: This paper presents the design of a tunable functionally graded metamaterial beam for flexural wave attenuation through the integration of a piezomagnetic shunt damping system and an inertial amplification mechanism. The proposed system demonstrates tunable and strong wave attenuation capability through local resonance and energy consumption. The theoretical and numerical results verify that the system can achieve significant wave attenuation at defined frequencies and also be optimized for maximal attenuation at various frequency ranges.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2024)