Article
Multidisciplinary Sciences
Akbar Ghazanfari Holagh, Javad Alizadeh Kaklar
Summary: In this study, the effect of material defect orientation on subsurface crack initiation in rolling bearings is investigated using finite element method (FEM). It is found that changing the defect orientation results in a threefold increase in the equivalent stress intensity factor (SIF) range.
SCIENTIFIC REPORTS
(2023)
Article
Materials Science, Multidisciplinary
Qi Zhao, Magd Abdel Wahab, Yong Ling, Zhiyi Liu
Summary: This paper develops a methodology that integrates crystal plasticity, the eXtended finite element method, and the cohesive zone model for predicting fatigue crack propagation across grain boundaries in an Al-Cu-Mg alloy. The numerical results demonstrate the promising application of this combined methodology in predicting crack deflection through grain boundaries.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Engineering, Multidisciplinary
Peng Zhang, Chengbin Du, Wenhu Zhao, Liguo Sun
Summary: This paper extends the static contact problem of crack faces to include dynamic contact and crack propagation using the scaled boundary finite element method. The Lagrange multiplier method is used to establish the contact model between the crack faces. Results demonstrate that the dynamic contact model effectively simulates crack faces' opening and closing, with the greater influence of non-linearity of contact along a crack face on dynamic stress intensity factor and response as the crack length increases.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2021)
Article
Energy & Fuels
Leilei Chen, Zhongwang Wang, Xuan Peng, Jianfeng Yang, Pengfei Wu, Haojie Lian
Summary: This paper simulates hydraulic fractures propagation under constant fluid pressure using isogeometric BEM, parametrizing crack propagation path with NURBS. The algorithm's effectiveness is validated through comparisons with experiments and other numerical methods, and the influence of different factors on crack propagation is studied.
GEOMECHANICS AND GEOPHYSICS FOR GEO-ENERGY AND GEO-RESOURCES
(2021)
Article
Engineering, Mechanical
Wei Jiang, Yinyin Li
Summary: This study investigates the effects of microstructure characteristics on the cumulative plastic slip (CPS) in the dominant slip system (DSS) at meso-scale and the J-integral at macro-scale using the combined crystal plasticity finite element method and variable-node finite element method. Experimental evidence shows that the grain size of the repaired layer is significantly smaller when an appropriate amount of nano tungsten carbide (WC) is added at the crack tip, leading to a greatly reduced J-integral in the repaired specimen. The addition of nano-WC during the laser repairing process serves to strengthen the material and refine the grain of the repaired layer, improving fracture properties.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2023)
Review
Chemistry, Physical
Jacob Fish, Gregory J. Wagner, Sinan Keten
Summary: Multiscale modelling is a powerful tool for simulating materials behavior across different length and time scales. It aims to simulate continuum-scale behavior using information from computational models of finer scales, rather than relying on empirical constitutive models. Various methods have been developed to bridge multiple length and time scales, including techniques integrating new fields such as machine learning and material design.
Article
Materials Science, Multidisciplinary
Mohammad Tauhiduzzaman, Islam Hafez, Douglas Bousfield, Mehdi Tajvidi
Summary: This study investigates the production of biodegradable lignocellulosic foams using wood flour or thermomechanical pulp fibers bound with cellulose nanofibrils (CNFs). Microwave drying is employed to create low-density porous foam structures, while multiscale modeling is used to predict the mechanical properties of the foams.
MATERIALS & DESIGN
(2023)
Article
Engineering, Mechanical
Jun-Yuan Zheng, J. Q. Ran, M. W. Fu
Summary: Traditional macro-scaled plasticity theories may not be fully valid in meso-/micro-scaled deformation studies due to size effects. The anisotropy of individual grains significantly affects the mechanical responses of polycrystalline metallic materials. Microcracks mainly initiate at grain boundary regions and grow along grain boundaries in meso-/microforming.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2022)
Article
Chemistry, Physical
Omar Alrayes, Carsten Koenke, Ean Tat Ooi, Khader M. Hamdia
Summary: The paper presents a numerical modeling approach using a scaled boundary finite element model (SBFEM) to simulate crack growth, with a focus on the stress field under monotonic and cyclic loading conditions. A new constitutive law is applied to describe the cohesive response, allowing for the modeling of crack propagation and damage accumulation. The method is validated through the analysis of single-edge-notched concrete beam subjected to three-point bending under different loading conditions, with good agreement between simulation results and experimental measurements.
Article
Engineering, Petroleum
Shivam Agrawal, Jason York, John T. Foster, Mukul M. Sharma
Summary: The study combines a Peridynamics-based hydraulic fracturing simulator with numerically efficient finite element methods and finite volume methods to significantly improve computational performance, addressing the issue of reduced computational speed.
Article
Engineering, Mechanical
Hamidreza Abdolvand
Summary: This paper describes in detail the incorporation of four different microstructure-sensitive damage mechanisms into a crystal plasticity finite element model. The performance of each model in predicting crack nucleation and propagation is studied by comparing the numerical results with experimental data. The results show that for different specimen textures, the principal stress and maximum slip methods can correctly predict the location and propagation direction of major cracks, while the energy method or principal plastic strain method mainly coincide with minor cracks or those that propagate at higher applied strains.
INTERNATIONAL JOURNAL OF PLASTICITY
(2022)
Article
Materials Science, Multidisciplinary
Daijun Hu, Nicolo Grilli, Wentao Yan
Summary: A temperature dependent continuum dislocation dynamics (CDD) model is developed and fully coupled with a crystal plasticity solver for investigating the formation and stability of dislocation structures in solid solution materials. The dynamics of dislocation structure formation at different positions during laser melting process and the effect of cyclic thermal stress during multi-layer fabrication are revealed using a multiscale modeling approach.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2023)
Article
Chemistry, Physical
Brayan Murgas, Sebastian Florez, Nathalie Bozzolo, Julien Fausty, Marc Bernacki
Summary: In this study, four different finite element level-set (FE-LS) formulations are compared for modeling grain growth in polycrystalline structures, with two using anisotropic grain boundary (GB) energy and mobility for the first time. Results show that the Anisotropic formulation is more physical, but can be replaced by an isotropic one for simple microstructures.
Article
Mechanics
Carlos G. Davila, Mathew W. Joosten
Summary: A new cohesive fatigue model (CF22) is proposed based on extensive experimental data characterization. To reduce the number of parameters required, experimental Paris law data is transformed into a plot of amplitude versus mean relative endurance and fitted using an empirical function. This novel characterization procedure helps identify trends and inconsistencies in the data and provides model input parameters without needing inverse analysis. The CF22 fatigue model improves the predictions of crack propagation rates and thresholds, especially under high stress ratios and mode mixity.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Mechanics
Yang Yang, Yijun Liu
Summary: The study presents a multi-scale method based on the combination of BEM and PD, which effectively models crack propagation in 2D elastic bodies. By separating non-cracked and cracked domains for processing and utilizing both BEM and PD, the method improves modeling efficiency and computational accuracy.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2021)
Article
Materials Science, Multidisciplinary
Ning Zhang, Yu Hong, Youping Chen
JOURNAL OF MATERIALS SCIENCE
(2019)
Article
Materials Science, Multidisciplinary
Yang Li, Weixuan Li, Xiang Chen, Adrian Diaz, David L. McDowell, Youping Chen
COMPUTATIONAL MATERIALS SCIENCE
(2019)
Article
Materials Science, Multidisciplinary
Yang Li, Zhaochuan Fan, Weixuan Li, David L. McDowell, Youping Chen
JOURNAL OF MATERIALS RESEARCH
(2019)
Article
Physics, Applied
Youping Chen, Sergei Shabanov, David L. McDowell
JOURNAL OF APPLIED PHYSICS
(2019)
Article
Materials Science, Multidisciplinary
Thanh Phan, Ji Rigelesaiyin, Youping Chen, Ashraf Bastawros, Liming Xiong
Article
Physics, Condensed Matter
Shuozhi Xu, Yang Li, Youping Chen
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
(2020)
Article
Materials Science, Multidisciplinary
Alex Selimov, Shuozhi Xu, Youping Chen, David McDowell
Summary: The study investigates the evolution of misfit structures at semi-coherent metal interfaces impinged by dislocation pileups using a Concurrent Atomistic-Continuum modeling framework, revealing the impact of different metals on the interface misfit structure.
JOURNAL OF MATERIALS RESEARCH
(2021)
Article
Physics, Applied
Jiaqi Sun, Yang Li, Yenal Karaaslan, Cem Sevik, Youping Chen
Summary: The structure and thermal boundary conductance of the wurtzite GaN/AlN (0001) interface were investigated through molecular dynamics simulation. Different empirical interatomic potentials resulted in similar misfit dislocation networks and core structures, with pure edge dislocations and an eight-atom ring structure being predominant. Despite variations in dislocation properties and thermal conductance values, all potentials showed a significant impact of misfit dislocations on the thermal boundary conductance of the GaN/AlN (0001) interface.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
Liming Xiong, Youping Chen, Irene J. Beyerlein, David McDowell
Summary: This article explores the mechanical, thermal, and mass transport behavior of materials using a multiscale approach, emphasizing the importance of developing methods that can handle both atomistic and continuum descriptions of materials. It encourages researchers to further develop advanced theories and algorithms.
JOURNAL OF MATERIALS RESEARCH
(2021)
Article
Materials Science, Multidisciplinary
Yang Li, Adrian Diaz, Xiang Chen, David L. McDowell, Youping Chen
Summary: The transient processes of phonon scattering and transmission in Si phononic crystals with periodic pores are simulated using the concurrent atomistic-continuum method. The study reveals the dependence of phonon transport on the relation between the phonon wavelength, period length, and neck width of the phononic crystal. Three distinct regimes of phonon transport are observed, each with different characteristics and dominant modes of transport.
Article
Materials Science, Multidisciplinary
Kevin Chu, Adrian Diaz, Youping Chen, Ting Zhu, David L. McDowell
Summary: This study explores the application of Concurrent Atomistic-Continuum method to model dislocation mobility in random alloys at extended length scales. The results demonstrate the elimination of spurious stresses in transition regions and accurate capture of local stress fluctuations in the dislocation core region with reduced degrees of freedom by nearly 40%.
COMPUTATIONAL MATERIALS SCIENCE
(2022)
Article
Computer Science, Interdisciplinary Applications
Adrian Diaz, Boyang Gu, Yang Li, Steven J. Plimpton, David L. McDowell, Youping Chen
Summary: This work presents a parallel algorithm for the Concurrent Atomistic Continuum (CAC) formulation that can be integrated into existing molecular dynamics codes. The algorithm is shown to offer good agreement with MD-only models in verification benchmarks, demonstrating its efficiency in simulating systems represented by both atoms and finite elements.
JOURNAL OF COMPUTATIONAL PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Yang Li, Zexi Zheng, Adrian Diaz, Simon R. Phillpot, David L. McDowell, Youping Chen
Summary: This work provides a quantitative and mechanistic understanding of the phonon-dislocation interaction in PbTe/PbSe (001) heterostructures using the Concurrent Atomistic-Continuum (CAC) method. The simulation results agree reasonably well with experimental observations. The study visualizes and quantifies the dynamic interaction between phonons and dislocations, and reveals two mechanisms for phonon-dislocation interaction. Furthermore, it demonstrates the collective motion of dislocations and the influence of misfit dislocations on the dynamic properties of the misfit dislocation network localized within one interface.
Article
Polymer Science
Nicholas Filla, Yiping Zhao, Xianqiao Wang
Summary: This article proposes innovative methods to address the issues in stochastic modeling of fibrous materials, such as estimating 3D fiber orientation distributions, achieving desired fiber tortuosity distributions, and dealing with fiber-fiber penetration. The methods introduced provide a mapping from 2D to 3D fiber orientation data and a means to select parameters for random walks to generate desired fiber tortuosity. These methods enhance the empirical consistency and tractability of stochastic modeling of fibrous materials.
Article
Physics, Fluids & Plasmas
Zexi Zheng, Yang Li, Xiang Chen, Youping Chen
Article
Engineering, Mechanical
Zhuang Sun, Yixin Zhao, Yirui Gao, Sen Gao, Davide Elmo, Xindong Wei
Summary: In this study, the modified semi-circular bending test was used to investigate the fracture toughness of coal samples with different sizes and bedding angles. The results showed that the fracture toughness of coal exhibits size effect and anisotropy. The crack initiation and propagation in hydraulic fracturing of coal seam can be influenced by bedding angles.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Engineering, Mechanical
Ruiming Zhang, Kai Ma, Wenzhu Peng, Jinyang Zheng
Summary: The fatigue crack growth rates of 4130X steel in different hydrogen concentrations were measured, and the influence of hydrogen on crack behavior was analyzed. Results show that the crack growth rate increases with increasing hydrogen pressure, reaching a threshold at 87.5 MPa.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Engineering, Mechanical
Hien Do, Phuc L. H. Ho, Canh V. Le, H. Nguyen-Xuan
Summary: In this study, a new method for determining the limit loads of fracture structures using the pseudo-lower bound method with adaptive quadtree meshes is proposed. The method overcomes the volumetric locking problem and handles the challenge of hanging nodes during refinement procedure by using quadtree meshes. The effectiveness of the approach is demonstrated through numerical validation.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Engineering, Mechanical
Weimin Song, Yuxin Fan, Hao Wu, Liang Zhou
Summary: This study proposed a novel test method to characterize the I-II mixed fracture toughness of asphalt pavement and investigated the effects of reclaimed asphalt pavement (RAP) and loading rate. The results showed that loading rate and inclusion of RAP had positive effects on fracture toughness.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Engineering, Mechanical
Zida Liu, Diyuan Li, Jianqiang Xia, Quanqi Zhu
Summary: In this study, the influence of flaw inclinations on the failure mechanism of fissured granite specimens was analyzed through a series of experiments. A quantitative method combining deep learning and scanning electron microscope was employed to identify the mesoscopic fracture mechanism of macroscopic cracks. The results indicated that the failure of fissured specimens was mainly caused by tensile stress and shear stress.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Engineering, Mechanical
Jiabing Zhang, Yiling Chen, Ronghuan Du, Xianglian Zhao, Jun Wu
Summary: This study investigated the mechanical characteristics and crack propagation behavior of sandstone-like samples with single cracks under freeze-thaw cycles. The results demonstrated the significant effects of crack angle and freeze-thaw cycles on the compressive strength and stability of the samples. Confining pressure inhibited the freeze-thaw deterioration, and the acoustic emission signals exhibited good consistency with the stress-strain curves. The simulation results matched well with the experimental results, and five crack propagation modes were proposed.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Engineering, Mechanical
Felix Boedeker, Pauline Herr, Anders Biel, Ramin Moshfegh, Stephan Marzi
Summary: Cohesive Zone Models with finite thickness are widely used for fracture mechanical modeling. Computational homogenization techniques are crucial for the development of advanced engineering materials. FFT-based homogenization scheme shows potential in reducing computational effort and has practical applications.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Engineering, Mechanical
Sobhan Pattajoshi, Sonalisa Ray, Yugal Kishor Joshi
Summary: In this work, a novel multi-layer composite structure is proposed for protective shelter design. The dynamic behavior and mechanical performance of the multi-layer composite under projectile impact loading are investigated. The proposed composite target demonstrates enhanced penetration resistance and lesser damage compared to its reinforced concrete monolayer counterpart. An analytical model is also developed to predict the forces transmitted to the lowest layer for design purposes.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Engineering, Mechanical
H. M. Shodja, M. T. Kamali, B. Shokrolahi-Zadeh
Summary: This study proposes a semi-analytical method for calculating the stress intensity factor of an internally pressurized eccentric annular crack. By using hypersingular integral equations and conformal mapping, accurate values of SIFs along the crack edges can be obtained. The material properties of the elastic matrix do not affect the SIF values, as demonstrated through the investigation of geometric parameters.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Engineering, Mechanical
Wen Hua, Zhanyuan Zhu, Wenyu Zhang, Jianxiong Li, Jiuzhou Huang, Shiming Dong
Summary: Accurate assessment and prediction of fracture behavior in cracked materials using mixed mode fracture criteria are crucial in fracture mechanics. This study comprehensively reviewed modified fracture criteria that incorporate T-stress for mixed mode I-II cracks. A comparative analysis was conducted between experimental results and theoretical predictions for five different cracked configurations. The study also discussed the effect of T-stress on crack initiation angle and fracture toughness, providing suggestions. The results showed variations in predictive accuracy across different cracked configurations due to disparities in T-stress. However, similar predictions were observed for semi-circular bend and edge-crack triangular specimens due to their similar biaxial stress ratio B. Different fracture criteria were suitable for different cracked configurations with positive or negative T-stresses.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Engineering, Mechanical
Qing-qing Shen, Qiu-hua Rao, Wei Yi, Dian-yi Huang
Summary: This study proposes a theoretical approach to forecast multi-crack propagation trajectories in a finite plate. By calculating the stress intensity factor (SIF) and analyzing the influence of crack size, the criteria for crack initiation and propagation in a finite plate are established. Experimental results demonstrate that the SIF of multiple cracks in a finite plate is consistently larger than that of an infinite plate.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Engineering, Mechanical
Songbai Li, Qiyun Zhu, Zhizhong Lu, Hongzhi Yan, Chu Zhu, Peize Li
Summary: This study investigates the effects of laser heating and laser shot peening on fatigue life of AA2524, and predicts the fatigue life using artificial neural networks and support vector regression models. The results show that laser heating and laser shot peening can significantly improve the fatigue life, and the neural networks have better prediction ability.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Engineering, Mechanical
V. Shlyannikov, A. Sulamanidze, D. Kosov
Summary: This paper presents experimental crack-growth data for thermomechanical fatigue conditions in nickel-based alloy components. The crack-growth experimental results are interpreted using finite element analyses and multi-physics numerical calculations. The results show that crack growth rate is slower under isothermal pure fatigue conditions, while it is faster under thermomechanical cyclic deformation conditions.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Engineering, Mechanical
Tairui Zhang, Xin Ma, Bin Yang, Wenchun Jiang, Zhiqiang Ge, Xiaochao Liu
Summary: This study experimentally investigated the fracture toughness distributions in dissimilar metal welds. The predictions of fracture toughness were made using three criteria and an energy release rate model. The results showed that using the critical strain criterion and ERR model resulted in higher consistency compared to mini-CTs, while the predictions using the critical stress criterion had high dispersion. The study also investigated the source of errors through damage developments and SEM observations.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Engineering, Mechanical
Yike Dang, Zheng Yang, Xiaoyu Liu, Jianghao Guo
Summary: This study uses discrete element modeling to examine bedded rock failure with parallel defects. It is found that bedding influences crack propagation direction but has limited impact on final failure. Shear failure accumulates at the bridge area and defect tip, while tensile failure occurs during nucleation region development.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
