Article
Materials Science, Ceramics
Chuandong Zuo, Qingxian Li, Qian Wang, Yuqiao Li, Long Li, Jiachen Wei, Yingfeng Shao, Fan Song
Summary: This study investigated the effects of thermal conductivity, specific heat, density, thermal expansion coefficient, Young's modulus, and fracture toughness on thermal shock cracks using the phase-field method based on alumina ceramics. The results indicated that increasing thermal conductivity and fracture toughness can reduce thermal shock damage, while increasing thermal expansion coefficient and Young's modulus can increase thermal shock damage. The study also tested the thermal shock of zirconia and found that the phase-field calculation results were consistent with the thermal shock results.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Article
Mechanics
Weiyuan Guan, Sauradeep Bhowmick, Guangjun Gao, Gui-Rong Liu
Summary: In this study, a 3D phase-field model based on CS-FEM is established to effectively capture the evolution of complex fracture morphology in elasto-plastic solids. The staggered algorithm provides a practical means to couple the phase field and displacement field, while the CS-FEM offers softer model behavior in solving the governing equations. The Phase-field CS-FEM approach presents an effective alternative means to model 3D fracturing in elasto-plastic solids, implemented in ABAQUS for verification against experimental observations and existing numerical results.
ENGINEERING FRACTURE MECHANICS
(2021)
Article
Engineering, Mechanical
Tao You, Haim Waisman, Qi-Zhi Zhu
Summary: The study introduces a modified phase-field damage model to capture the brittle-to-ductile failure transition in geomaterials. Calibration of eight material parameters and numerical simulations demonstrate the model's ability to accurately predict failure patterns and mechanisms.
INTERNATIONAL JOURNAL OF PLASTICITY
(2021)
Article
Engineering, Multidisciplinary
Liang Yang, Yongtao Yang, Hong Zheng, Zhijun Wu
Summary: The paper proposes an algorithm in which the values of phase field are used to identify crack paths, and physical patches are then cut by reconstructed crack paths to obtain explicit cracks and jump displacement field. The numerical examples demonstrate the predictions of various explicit cracks by the proposed method are in good agreement with literature, and Sneddon's example verifies the discontinuous displacement field across explicit cracks is consistent with the closed form solution. The proposed numerical model warrants further investigation.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2021)
Article
Construction & Building Technology
Xiaofei Hu, Huiqian Xu, Xun Xi, Peng Zhang, Shangtong Yang
Summary: This paper develops a meso-scale phase field model for concrete cover cracking induced by corrosion of multiple reinforcements. The model is verified against experimental results, and the effects of reinforcement spacing, cover thickness, and ITZ fracture properties on concrete cover cracking are investigated. The model captures various toughening mechanisms and enables high fidelity numerical predictions.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Mechanics
Wenqiang Xu, Hanzhang Li, Yu Li, Teng Wang, Shenghua Lu, Sheng Qiang, Xia Hua
Summary: In this paper, a novel adaptive refinement strategy and virtual crack insertion technique for phase-field models are proposed. These techniques have been proven to enhance efficiency in calculation and are applicable for fracture problems, as demonstrated by numerical experiments.
ENGINEERING FRACTURE MECHANICS
(2022)
Article
Mechanics
Xurui Fang, Zichao Pan, Airong Chen, Hao Tian, Rujin Ma
Summary: In this paper, a coupled phase-field model is proposed to investigate the time-dependent process of non-uniform corrosion-induced cover cracking. The model includes chloride and oxygen diffusion, electrochemical reaction, and concrete cover cracking. A time-dependent non-uniform corrosion model is established based on chloride diffusion and electrochemical theory considering the effect of cracking. The cracking behavior of the concrete cover is described using a phase-field regularized cohesive zone model. The model is verified against several experiments and parametric studies are conducted to observe the effects of crack and chloride diffusion coefficient, interaction between corrosion of multiple rebars, and crack characteristics in three dimensions.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Chemistry, Multidisciplinary
Siavash Nikravesh, Yu-Lin Shen
Summary: This study investigated the effects of deformation history involving different loading sequences on the surface wrinkling instability. The results showed that the loading path played an important role in the temporal development of wrinkle configurations, leading to different surface patterns.
Article
Materials Science, Multidisciplinary
Ce Xiao, Jean-Yves Buffiere, Jean Michel Letang, Wolfgang Ludwig
Summary: The higher lateral coherence length of beams at high brilliance synchrotron sources can improve crack detectability in Synchrotron Radiation Computed Tomography (SRCT) images, but non-planar cracks may lead to strong artifacts, making quantitative crack analysis difficult. Investigation through phase contrast tomography simulations showed that these artifacts come from Fresnel interference patterns on the detector, which can be minimized by reducing phase contrast intensity or inclining cracks with respect to the beam trajectory plane.
MATERIALS CHARACTERIZATION
(2022)
Article
Nanoscience & Nanotechnology
M. Verma, R. Mukherjee
Summary: In this work, we use a three-dimensional phase-field model to understand the mechanism of corner instability during capillary-driven hole growth in a single-crystalline free-standing thin film. We systematically study the effects of crystalline anisotropy in surface energy, surface diffusivity, and film thickness on hole growth. Our simulations reveal that the instability during hole growth is caused by the saturation of rim height at the corner, which is determined by the anisotropy in surface energy. Furthermore, our investigation shows the presence of a time-invariant shape of the corner with the onset of corner instability.
SCRIPTA MATERIALIA
(2023)
Article
Mathematics, Interdisciplinary Applications
Stefan Loehnert, Christian Krueger, Verena Klempt, Lukas Munk
Summary: This paper presents an enriched phase-field method for the simulation of 2D fracture processes, which has the potential to greatly reduce computational cost compared to the classical phase-field method. The method combines a phase-field approach with an ansatz transformation and an enrichment technique, allowing for the application of coarser meshes while still obtaining accurate solutions. Unlike classical XFEM / GFEM, this method simplifies the simulation of crack initiation, propagation, and coalescence by not requiring level set techniques or explicit representations of crack geometries.
COMPUTATIONAL MECHANICS
(2023)
Article
Materials Science, Multidisciplinary
Subhendu Chakraborty, Somnath Ghosh
Summary: This paper presents a method for enhancing the Helmholtz free energy density functionals in coupled crystal plasticity phase-field finite element models of fracture by considering the influence of atomic-scale, crack-tip nucleated dislocations. The proposed approach is motivated and calibrated by energy equivalence between atomistic-continuum scale models, demonstrating the significant effect of nucleated dislocations on crack evolution.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2021)
Article
Mechanics
Qingzhen Yang, Yankui Liu, Xinmiao Jia, Tingting Zhang, Fenhong Song
Summary: This article introduces the characteristics of thermocapillary instability and the method of using it to fabricate micro/nano-polymeric structures. It proposes a fully nonlinear numerical model based on the phase field method to study the dynamic process and influencing factors of thermocapillary instability, and explores the instability under multi-mode conditions.
Article
Construction & Building Technology
Amir Hossein Asjodi, Mohammad Javad Daeizadeh, Mohammadjavad Hamidia, Kiarash M. Dolatshahi
Summary: A new image-based method called the Arc Length method is introduced for accurately extracting crack width and length, showing high efficiency in crack monitoring in laboratory experiments. The method has significant potential applications in crack monitoring of infrastructures like concrete bridges and tunnels.
STRUCTURAL CONTROL & HEALTH MONITORING
(2021)
Article
Chemistry, Multidisciplinary
Lorena Paseta, Carlos Echaide-Gorriz, Carlos Tellez, Joaquin Coronas
Summary: Polyamide thin film composite membranes (TFC) prepared by interfacial polymerization from the vapor phase show greener characteristics and higher water permeance in nanofiltration, with dye rejections higher than 94% in all cases.
Article
Statistics & Probability
Ting Tian, Jingwen Zhang, Shiyun Lin, Yukang Jiang, Jianbin Tan, Zhongfei Li, Xueqin Wang
Summary: This study utilized interventions implemented in China and applied them to simulate the potential outcomes in South Korea, Italy, and the United States. The results showed that mild interventions in the early stage were effective in controlling the epidemic, while stricter measures were necessary for severe outbreaks.
JOURNAL OF APPLIED STATISTICS
(2023)
Article
Engineering, Electrical & Electronic
Sizhe Xing, Guoqiang Li, Aolong Sun, Jiang Chen, Zhixue He, Junwen Zhang, Nan Chi
Summary: This study demonstrates a rate-flexible coherent TDM-PON in burst-mode based on PS-QAMmodulations and LO power adjustment technology, achieving a 300G peak rate and ultra-wide dynamic range. A new metric, DRNRP, is introduced to indicate the overall performance of achievable capacity and flexibility.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Guoqiang Li, Sizhe Xing, Junlian Jia, Zhongya Li, Junwen Zhang, Nan Chi
Summary: Coherent technology is a promising solution for future 100-Gb/s and even
200-Gb/s single-wavelength time-division multiplexing passive optical network (TDM-PON) systems. One of the key issues for coherent TDM-PON is the upstream burst-mode amplification.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Jianyang Shi, Zhongya Li, Junlian Jia, Ziwei Li, Chao Shen, Junwen Zhang, Nan Chi
Summary: In this paper, a learning-based waveform-to-waveform automatic equalization framework is proposed to overcome the shortcomings of small bandwidths and high harmonic interference levels in a seamless fiber-terahertz integrated communication system. Experimental results show that with this method, a data rate of 80.78 Gbps can be achieved for discrete multitone modulation signals over 5 km of fiber and 1 m of 209-GHz terahertz signals. Compared to an approach without preprocessing, a receiver sensitivity gain exceeding 1.3 dB is successfully achieved at a data rate of 60 Gbps. This proposed method is a promising scheme for future seamless fiber-terahertz integrated communication systems that require high speed and low cost.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Computer Science, Artificial Intelligence
Junwen Zhang, Xiaolong Zhang, Ziqi Zhu, Chunhua Deng
Summary: The joint detection and re-ID strategy simplifies the multi-object tracking process by sharing network features and sacrificing the complex probability graph model. To tackle the target transfer challenge in dense scenes, a probability graph model suitable for joint detection and re-ID is proposed. The proposed model calculates the matching degree between candidate detections and historical trajectories and transforms the ID matching task in the re-ID process into an energy minimization problem of a conditional random field (CRF), which simplifies the solution space of the CRF problem.
COMPLEX & INTELLIGENT SYSTEMS
(2023)
Article
Optics
Zhongya Li, Junlian Jia, Guoqiang Li, Boyu Dong, Wangwei Shen, Changle Huang, Jianyang Shi, Nan Chi, Junwen Zhang
Summary: In this study, a deep-learning-based end-to-end multi-user communication framework is proposed and demonstrated for a fiber-mmWave integrated system. Artificial neural networks are trained and optimized as transmitters, channel models, and receivers to support multi-user access in one fiber-mmWave channel.
Article
Chemistry, Analytical
Wenkai Yue, Ruixuan Liu, Peixian Li, Xiaowei Zhou, Yang Liu, Bo Yang, Yingxiao Liu, Xiaowei Wang
Summary: This paper investigates the effect of high-temperature annealing on the X-ray diffraction full width at half the maximum (XRD FWHM) of a 3.5 mu m-thick hydride vapor phase epitaxy-aluminum nitride (HVPE-AlN) (002) face. Tensile strain in the HVPE-AlN samples is gradually released with increasing annealing temperature. An aluminum oxynitride (AlON) region is generated at the contact interface between HVPE-AlN and sapphire when the annealing temperature exceeds 1700 degrees C, and the AlON structure conforms to the characteristics of Al5O6N.
Article
Geosciences, Multidisciplinary
Junwen Zhang, Yani Yan, Zhiqi Zhao, Congqiang Liu
Summary: This study analyzed the concentration and isotopic composition of lithium in river waters from the Niyang River, southern Tibetan Plateau. The results show that high isotopic values mainly come from geothermal water and silicate weathering. The study suggests that geothermal water input may mask the lithium isotope signal of silicate weathering in river water, affecting the accurate understanding of the relationship between lithium isotopic composition and weathering intensity in the river basin.
SCIENCE CHINA-EARTH SCIENCES
(2023)
Article
Environmental Studies
Shukui Tan, Bin Tong, Junwen Zhang
Summary: Land contracting is an important system in China and has made significant contributions to food security and agricultural development. However, the increase in land values has led to a rise in land contract disputes. This study used statistical methods, spatial analysis tools, and Markov Chains to analyze the temporal and spatial characteristics of land contract disputes in the Yangtze River Economic Belt. The results provide valuable insights for dealing with land contract disputes in relevant regions.
Proceedings Paper
Engineering, Electrical & Electronic
Wangwei Shen, Sizhe Xing, Guoqiang Li, Zhongya Li, An Yan, Jiaye Wang, Junwen Zhang, Nan Chi
Summary: We propose and demonstrate a novel three-dimensional flexible coherent passive optical network (PON) with resource-allocation capability in time, frequency, and power domain. High flexibility is demonstrated with over 100G transmission over 20-km fiber for coherent PON in the downstream.
2023 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION, OFC
(2023)
Proceedings Paper
Engineering, Electrical & Electronic
Boyu Dong, Junlian Jia, Guoqiang Li, Jianyang Shi, Haipeng Wang, Zhenzhou Tang, Junwen Zhang, Shilong Pan, Nan Chi
Summary: We propose and experimentally demonstrate a novel W-band photonic-based integration of sensing and communication system for the fiber-wireless integrated network, achieving adaptive sensing resolution and communication data-rates with flexible waveforms and TFDM resource allocation capability.
2023 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION, OFC
(2023)
Proceedings Paper
Engineering, Electrical & Electronic
Guoqiang Li, An Yan, Sizhe Xing, Zhongya Li, Wangwei Shen, Jiaye Wang, Junwen Zhang, Nan Chi
Summary: To address burst-signal processing in downstream transmission when switching modulation formats, we propose and experimentally demonstrate a pilot-aided DSP scheme with continuous SOP tracking, carrier-phase recovery, and channel estimation in a 300G flexible CPON based on 4/16/64-QAMs.
2023 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION, OFC
(2023)
Proceedings Paper
Engineering, Electrical & Electronic
Zhongya Li, Changle Huang, Junlian Jia, Guoqiang Li, Wangwei Shen, Jianyang Shi, Ziwei Li, Chao Shen, Junwen Zhang, Nan Chi
Summary: In this paper, we proposed and experimentally demonstrated a bit-wise end-to-end deep learning-based autoencoder for a fiber-THz integrated DFT-S-OFDM communication system at 209 GHz. Compared with the traditional DFT-S-OFDM system at 50 Gbps, it achieved a sensitivity gain of more than 5.5 dB.
2023 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION, OFC
(2023)
Meeting Abstract
Gastroenterology & Hepatology
Zheng Zhang, Peng Li, Sheng Wang, Zhendong Jin, Yiqi Du, Aiming Yang, Yunlu Feng, Xiaoping Zou, Lei Wang, Xiaoyan Wang, Li Tian, Pinghong Zhou, Yiqun Zhang, Jun Liu, Zhen Ding, Junwen Zhang, Jian Yang, Siyu Sun, Shutian Zhang
JOURNAL OF GASTROENTEROLOGY AND HEPATOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Chupeng Yi, Yang Lu, Ziyue Zhao, Hengshuang Zhang, Bochao Zhao, Peixian Li, Xiaohua Ma, Yue Hao
Summary: This paper presents a design for a K-band high-efficiency power amplifier (PA) using modified resistive-reactive hybrid continuous modes (HCMs). The modified modes increase the real part of the fundamental impedance which helps reduce the impedance transformation ratio and make HCMs more practical. By combining this method with a compact output matching network (OMN), a high-performance and highly integrated PA can be achieved. Experimental results show that the designed PA has a saturation output power greater than 0.5 W and an average power-added efficiency (PAE) of 42%.
IEEE MICROWAVE AND WIRELESS TECHNOLOGY LETTERS
(2023)
Article
Mechanics
Zhiqiang Meng, Xu Gao, Hujie Yan, Mingchao Liu, Huijie Cao, Tie Mei, Chang Qing Chen
Summary: This paper presents a cage-shaped, self-folding mechanical metamaterial that exhibits multiple deformation modes and has tunable mechanical properties, providing multifunctional applications in various fields.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2024)
Article
Mechanics
Hasan Murat Oztemiz, Semsettin Temiz
Summary: Sandwich panel composites have various applications and their mechanical behavior and performance depend on material properties and geometry. The load-carrying capacity of S-core composite sandwich panels increases with the increase of the core wall thickness, but decreases with the increase of the core height.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2024)
Article
Mechanics
Yang Sun, Wei Zhang, Weipeng Hu, Mabao Liu
Summary: The study presents a novel computational framework to investigate the effect of graphene percolation network on the strength-ductility of graphene/metal composites. It utilizes the Cauchy's probabilistic model, the field fluctuation method, and the irreversible thermodynamics principle.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2024)
Article
Mechanics
Elaheh Kazemi-Khasragh, Juan P. Fernandez Blazquez, David Garoz Gomez, Carlos Gonzalez, Maciej Haranczyk
Summary: This study explores group interaction modelling (GIM) and machine learning (ML) approaches for predicting thermal and mechanical properties of polymers. ML approach offers more reliable predictions compared to GIM, which is highly dependent on the accuracy of input parameters.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2024)
Article
Mechanics
Yafei Yin, Shaotong Dong, Dong Wu, Min Li, Yuhang Li
Summary: This paper investigates a bending-induced instability in sandwiched composite structures, and establishes a phase diagram to predict its characteristics. The results are of great significance in understanding the physical mechanisms of bending instability and providing design guidelines for practical applications.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2024)
Article
Mechanics
Dhairya R. Vyas, Sharen J. Cummins, Gary W. Delaney, Murray Rudman, Devang V. Khakhar
Summary: In this study, multiple collisions of granules on a substrate are analyzed using Collisional Smooth Particle Hydrodynamics (CSPH) to understand the influence of impact-induced deformation on subsequent collision dynamics. It is found that the collision dynamics are dependent on the impact location and the deformation caused by preceding impacts. The accuracy of three theoretical models is also evaluated by comparing their predictions with CSPH results, and it is discovered that these models are only useful for predicting collisions at the same location repeatedly.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2024)
Article
Mechanics
Sneha B. Cheryala, Chandra S. Yerramalli
Summary: The effect of hybridization on the growth of interface crack along the fiber is predicted. The study shows an enhancement in the compressive splitting strength with hybridization due to the lateral confinement effect on the interfacial crack.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2024)
Article
Mechanics
Xiang-Nan Li, Xiao-Bao Zuo, Liang Li, Jing-Han Liu
Summary: A multiscale mechanical model is proposed to quantitatively describe the macro-mechanical behavior of fiber reinforced concrete (FRC) based on its multiscale material compositions. The model establishes the stiffness and strength equations for each scale of FRC and demonstrates the influence of steel fiber parameters on the mechanical properties of FRC.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2024)
Article
Mechanics
Vicente Ramirez-Luis, Hilario Hernandez-Moreno, Orlando Susarrey-Huerta
Summary: In this paper, a Multicell Thin-walled Method is developed for studying the stress distributions in multimaterial beams. This method accurately obtains complex stress fields while reducing the solution time and computational cost. Validation with the finite element method confirms the accuracy of the proposed method.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2024)
Article
Mechanics
Yanfeng Zheng, Siyuan Li, Jingyao Zhang, Yaozhi Luo
Summary: This study proposes an enhanced simplified model based on finite particle method (FPM) to consider the link cross-sectional size and contact in Bennett linkages. The model introduces virtual beams and contact forces to accurately simulate the real-world behavior of Bennett linkages. The proposed method is effective for dynamic analysis of large-scale deployable Bennett linkages and shows great potential.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2024)
Article
Mechanics
Viktoriya Pasternak, Heorhiy Sulym, Iaroslav M. Pasternak
Summary: This paper investigates anisotropic elastic, magnetoelectroelastic, and quasicrystal solids and presents their equations of time-harmonic motion and constitutive relations in a compact and unified form. A matrix approach is proposed to derive the 3D time-harmonic Green's functions for these materials. The effects of phason field dynamics on the phonon oscillations in quasicrystals are studied in detail. The paper provides a strict proof that the eigenvalues of the time-harmonic magnetoelectroelaticity problem are all positive. It also demonstrates the application of the obtained time-harmonic Green's functions in solving boundary value problems for these materials using the derived boundary integral equations.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2024)
Article
Mechanics
Jan Tomec, Gordan Jelenic
Summary: This paper investigates the relationship between different formulations and contact-force models in beam-to-beam contact mechanics. It specifically addresses the recently developed mortar method and develops its variant based on the penalty method. The developed elements are tested using the same examples to provide an objective comparison in terms of robustness and computational cost.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2024)
Article
Mechanics
Paulo Teixeira Goncalves, Albertino Arteiro, Nuno Rocha, Fermin Otero
Summary: This work presents a novel formulation of a 3D smeared crack model for unidirectional fiber-reinforced polymer composites based on a stress invariant approach for transverse yielding and failure initiation. The performance of the model is evaluated using monotonic and non-monotonic damage evolution, verified with single element tests and compared with experimental results.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2024)
Article
Mechanics
Hanbin Yin, Yinji Ma, Xue Feng
Summary: This paper investigates the peeling behavior of a viscoelastic film bonded to a rigid substrate and establishes a theoretical peeling model. The study reveals three typical relationships between the peeling force and peeling velocity, which depend on the viscous dissipation within the film and the rate-dependent adhesion at the interface. Additionally, factors such as film thickness, interfacial toughness, and interfacial strength are identified as influencing the steady-state peeling force.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2024)
Article
Mechanics
Peter Noe Poulsen, John Forbes Olesen
Summary: Finite Element Limit Analysis (FELA) is increasingly used to calculate the ultimate bearing capacity of structures made of ductile materials. This study presents a consistent and general weak formulation based on virtual work for both the lower and upper bound problem, ensuring uniqueness of the optimal solution. A plane element with linear stress variation and quadratic displacement field is introduced, showing good results for load level, stress distribution, and collapse mechanism even for coarse meshes in verification and reinforced concrete examples.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2024)