Article
Mechanics
Gili Lifshitz Sherzer, Younes Fadakar Alghalandis, Karl Peterson
Summary: In this study, we have developed innovative improvements to the Lattice Discrete Particle Model (LDPM) that enable accurate simulation of aggregate fracturing in concrete. By comparing the simulation results with scans of actual cracking, we have achieved matching fracturing patterns. Furthermore, our method has demonstrated good fits for the brittleness of High Strength Concrete (HSC) when compared with experimental results for a three-point bending beam with a notch.
ENGINEERING FRACTURE MECHANICS
(2022)
Article
Geochemistry & Geophysics
Meiben Gao, Shenghua Cui, Tianbin Li, Chunchi Ma, Zhongteng Wu, Yan Zhang, Yang Gao, Zhe Fu, Yuyi Zhong
Summary: The three-parameter Weibull distribution is capable of fitting various experimental data and provides a unified expression for characterizing different constitutive behaviors of rocks. A statistical damage constitutive model based on this distribution was constructed and proven effective in expressing elastic-brittle, strain softening, and elastic-plastic behaviors of rocks. It has potential applications in numerical simulations for mining engineering, geoengineering, and other rock engineering fields.
Article
Mechanics
Masoud Rezaei, Mohsen A. Issa
Summary: This paper presents a comprehensive experimental investigation of the dynamic size effect and fracture characteristics of concrete, exploring the effect of structural size and aggregate size on the dynamic strength of concrete.
ENGINEERING FRACTURE MECHANICS
(2022)
Article
Engineering, Multidisciplinary
Sindhu Nagaraja, Ulrich Roemer, Hermann G. Matthies, Laura De Lorenzis
Summary: This study investigates variational phase-field formulations to model zigzag crack patterns in cubic materials. The main objectives are to analyze the behavioral aspects predicted by two fourth-order models and guide the calibration of their unknown parameters, as well as to transition from a deterministic to a stochastic model by introducing a material-related random field. Statistical moments of the phase-field variable are estimated using Monte Carlo, randomized quasi-Monte Carlo, and stochastic spectral methods. The stochastic approach holds significant promise in enabling meaningful predictions of anisotropic fracture with phase-field models.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2023)
Article
Mathematics, Interdisciplinary Applications
Zhiheng Luo, Lin Chen, Nan Wang, Bin Li
Summary: This article introduces a phase-field model for strongly anisotropic fracture and numerically examines the influence of the local maximum energy release rate principle on crack propagation direction.
COMPUTATIONAL MECHANICS
(2022)
Article
Engineering, Mechanical
Pengfei Jia, Kai Huang, Hongjun Yu, Takahiro Shimada, Licheng Guo, Takayuki Kitamura
Summary: This paper proposes a novel atomic J-integral calculation method, which calculates the local displacement gradient and stress field for discrete models, and verifies its effectiveness and path-independency. It is also confirmed that this method is dimension-independent even at ultra-small scales.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2022)
Article
Engineering, Mechanical
Simone Sangaletti, Anatoli Mitrou, Israel G. Garcia, Albertino Arteiro
Summary: Continuous Fiber 3D printing is a new technology that allows tailored reinforcement in critical regions of structural components, following stress lines. The influence of fiber deposition path on mechanical and failure behavior was assessed using a phase field model. Comparisons with experimental results demonstrated the method's ability to predict reinforcement paths in unidirectional composite plates. The study also showed that components with reinforcement along stress lines had higher strength than unidirectionally reinforced ones and emphasized the importance of considering damage analysis for assessing strength improvement.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2023)
Article
Materials Science, Ceramics
Roman Papsik, Oldrich Sevecek, Eric Martin, Raul Bermejo
Summary: Crack initiation in brittle materials upon spherical indentation is influenced by tensile radial stresses during loading. The location of crack onset often differs from the site of maximal stress. The initiation forces and location of crack onset depend on geometrical parameters and surface condition. A coupled stress-energy fracture criterion is introduced in this work to describe the initiation of ring cracks in brittle materials, considering the geometry of the contact and the material's inherent strength and fracture toughness. The criterion can explain the location offset of the ring crack upon loading and predict the initiation force, provided surface compressive stresses are considered. The criterion can also estimate the surface residual stress of ceramic parts based on contact damage experiments.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Multidisciplinary
Bo Zhang, Qing Chang, Zhan Sun, Degang Li, Hui Pan, Lixia Zhang
Summary: A novel concept is proposed to address the issue of continuous brittle phases degrading the mechanical properties of a brazed joint. In this concept, a network-like structure is inserted to spatially divide the brazing seam and disperse the continuous brittle phases. The concept is verified in a specific brazing system using Ti3SiC2 ceramic and Ti2AlNb alloy brazed by an AgCu interlayer. Ductile Cu foam with a network-like structure is used to disperse the continuous brittle TiCuSi intermetallic. The results show that the Cu foam effectively disperses the brittle TiCuSi intermetallic, significantly improving the mechanical properties of the brazed joint.
MATERIALS & DESIGN
(2022)
Article
Multidisciplinary Sciences
Gennady Kolesnikov, Maria Zaitseva, Aleksey Petrov
Summary: The relevance of problems related to fracturing in engineering materials and structures remains significant over time. In this study, the focus is on modifying an analytical model to predict strength and the full load-displacement (or stress-strain) curve using only pre-peak loading. The results of the study are consistent with experimental findings.
Article
Engineering, Multidisciplinary
Leo Morin, Amit Acharya
Summary: This study develops a computational model for arbitrary brittle crack propagation within a fault-like layer in a 3D elastic domain, and analyzes its associated quasi-static and dynamic fields. The model utilizes FFT-based solver for linear momentum balance and a Godunov-type projection-evolution method for crack evolution equation. Applications of the model include exploring equilibria, irreversibility, strength and toughness criteria, and crack propagation under different loading conditions.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2021)
Article
Engineering, Geological
Q. Zhou, H. P. Xie, Z. M. Zhu, R. He, H. J. Lu, Z. D. Fan, X. F. Nie, L. Ren
Summary: Insight into the anisotropic fracture properties of shale under high in situ stress is given through a series of hydraulic fracturing tests on double wing crack specimens of Longmaxi shale. The study finds that the fracture resistance of shale significantly increases with confining pressure, and both fracture toughness and fracture energy exhibit remarkable anisotropies. The study also highlights the influence of in situ stress on shale fracture anisotropy, which should be carefully considered in hydraulic fracturing design.
ROCK MECHANICS AND ROCK ENGINEERING
(2023)
Article
Mechanics
Branislav Djordjevic, Sreten Mastilovic, Aleksandar Sedmak, Aleksandar Dimic, Milan Kljajin
Summary: The phenomenon of ductile-to-brittle transition in ferritic steels has been a research challenge for the last 50 years. Fracture mechanics concepts have been used to characterize this problem and statistical methods have been applied to deal with the scatter of experimental data. This paper provides a historical overview of the studies in this field and presents two new approaches.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Mechanics
Gery De Saxce
Summary: The paper proposes a paradigm shift for the variational approach to brittle fracture. It addresses both dynamics and the limit case of statics within the same framework, using a space-time principle. The focus is on modeling crack extension using the internal variable formalism and a dissipation potential, rather than Griffith's original approach based on surface area. The new formulation appears to be more adaptable and generalizable than the standard theory.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2022)
Article
Mechanics
Sindhu Nagaraja, Pietro Carrara, Laura De Lorenzis
Summary: Experiments and phase-field modeling were used to study the anisotropic elastic and fractural behavior of solar-grade monocrystalline silicon. Tension tests and notch tests were performed to characterize the material's elasticity and fracture toughness. The results showed that phase-field modeling can accurately predict anisotropic brittle fracture in monocrystalline silicon and reproduce different crack patterns.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Materials Science, Multidisciplinary
Zhiqiang Li, Xiaoxiao Hu, Zhao-Yun Zeng, Yajiang Chen, Ai-Xi Chen, Xiaobing Luo
Summary: This work demonstrates how the current phase transition of atomic Bose-Einstein condensates in a trap can be controlled by applying an oscillatory driving field. The self-trapping effect in momentum space allows for a suppression of oscillations and a nearly constant directed current. Mean-field chaos serves as an indicator of the quantum phase transition. These findings are supported by an effective three-mode model.
RESULTS IN PHYSICS
(2024)
Article
Materials Science, Multidisciplinary
Jinqin Ye, Yi Li, Jun Ding, Heng Yu, Xianqi Dai
Summary: Constructing van der Waals heterostructures is an efficient approach to enhance the properties and broaden the applications of two-dimensional materials. This study explores the structure, stability, electronic, and optical properties of BlueP/MoSSe heterostructures using density functional theory calculations. It is found that the bandgap and band edge of these heterostructures can be effectively modulated by strain and electric field.
RESULTS IN PHYSICS
(2024)
Article
Materials Science, Multidisciplinary
Simone Anzellini, Silvia Boccato, Samuel R. Baty, Leonid Burakovsky, Daniele Antonangeli, Daniel Errandonea, Raffaella Torchio
Summary: The melting line of cobalt was investigated through experimental and theoretical methods, revealing a phase transition from hexagonal close-packed structure to face-centered cubic structure at high temperatures. The melting temperatures obtained from both methods showed good agreement and can be described by a Simon-Glatzel equation. Additionally, a thermal equation of state for the face-centered cubic phase of cobalt was determined.
RESULTS IN PHYSICS
(2024)
Article
Materials Science, Multidisciplinary
Jiajuan Qing, Shisheng Zhou, Jimei Wu, Mingyue Shao
Summary: This paper investigates the nonlinear chaotic vibrations of fractional viscoelastic PET membranes subjected to combined harmonic and variable axial loads. The viscoelasticity of PET membrane is characterized by the fractional Kelvin-Voigt model. The reliability of the numerical strategy is proved by comparing the results with available fractional systems and examples. The influence of system parameters on chaotic behaviors is described using bifurcation diagrams and detailed responses. This research provides a fundamental framework for controlling viscoelastic substrates in flexible manufacturing.
RESULTS IN PHYSICS
(2024)
Article
Materials Science, Multidisciplinary
Aly R. Seadawy, Syed T. R. Rizvi, Bazgha Mustafa, Kashif Ali
Summary: In this research, the complete discriminant system of polynomial method is used to analyze the dynamic characteristics of the cubic-quintic nonlinear Schrodinger equation with an additional anti-cubic nonlinear term, with a focus on the introduction of various optical solitons and wave structures. The analysis illustrates the importance of the polynomial method and provides dynamic results for the solutions.
RESULTS IN PHYSICS
(2024)
Article
Materials Science, Multidisciplinary
Ruihang Huang
Summary: This study utilized bibliometric analysis to examine the development of multi-scale calculation of carbon nanotubes. Using CiteSpace III software, 1253 relevant articles from the SCI Expanded database were analyzed to identify research trends in this field. The findings revealed significant progress in the research of multi-scale calculation of carbon nanotubes from 1999 to 2023. The analysis of keywords, literature co-citation network, and keyword cluster network provided valuable insights into the knowledge base, important research results, and research hotspots in this field. Additionally, the study predicted future hot research directions using keyword breakout analysis. The research provides profound insights and important guidance for researchers and policymakers in the field of multi-scale calculation of carbon nanotubes to promote further innovation and development.
RESULTS IN PHYSICS
(2024)
Article
Materials Science, Multidisciplinary
Xiaohua Zhou, Erhu Zhang, Shumin Zhao, Lei Zhang
Summary: A theoretic model is proposed to study the adhesion behavior of a vesicle adhering inside another vesicle in 2-D case. The model investigates the equilibrium shape equations and boundary conditions, and reveals the phase diagram and critical adhesion condition in different situations.
RESULTS IN PHYSICS
(2024)
Article
Materials Science, Multidisciplinary
Xin Yi, Jia-Cheng Huo, Yong-Pan Gao, Ling Fan, Ru Zhang, Cong Cao
Summary: The paper introduces an iterative quantum algorithm based on quantum gradient descent to solve combinatorial optimization problems, verifying the effectiveness and robustness of the algorithm through numerical simulations and comparison with other algorithms. Experimental results on a real quantum computer also demonstrate the feasibility and performance of the algorithm.
RESULTS IN PHYSICS
(2024)