Article
Materials Science, Multidisciplinary
Jiawei Chen, Shuang Liang, Yaxin Zhu, Lv Zhao, Minsheng Huang, Zhenhuan Li
Summary: Hydrogen ingression in metals generally leads to catastrophic failure. This study investigates the distribution of hydrogen around nickel grain boundaries and its influence on crack propagation behavior. The results show that hydrogen enhances dislocation emission from grain boundaries, while the crack tip remains sharp, leading to alternating intergranular fracture with ductile-brittle behavior.
COMPUTATIONAL MATERIALS SCIENCE
(2022)
Review
Metallurgy & Metallurgical Engineering
Kenji Higashida, Masaki Tanaka, Sunao Sadamatsu
Summary: The crack-tip shielding effect by dislocations is the most fundamental mechanism governing the fracture toughness of crystalline materials. The increase of fracture toughness during the brittle-to-ductile transition is closely related to the shielding effect due to dislocations around the crack-tip. This paper reviews the theory of crack-tip shielding, its experimental evidence, and the influence of interatomic bonding on macroscopic fracture toughness.
ISIJ INTERNATIONAL
(2022)
Article
Engineering, Multidisciplinary
Moirangthem Dinachandra, Alankar Alankar
Summary: An adaptive refinement scheme is proposed in this study to reduce the complexity and cost of computations in phase-field models, and the effectiveness of the method is successfully demonstrated.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2022)
Article
Chemistry, Physical
Xiu Ran, Songrong Qian, Ji Zhou, Zhengyun Xu
Summary: We introduced a coupled peridynamic hydrogen diffusion and fracture model to solve the hydrogen embrittlement fracture of low alloy steel AISI 4340. The model considers the influence of temperature on hydrogen diffusion coefficient and uses a new peridynamic constitutive analysis method to simulate the crack propagation of hydrogen embrittlement. The model was verified through experimental tests and can numerically simulate the entire process of hydrogen atom diffusion and crack growth.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
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
Mechanics
Meichao Lin, Haiyang Yu, Yu Ding, Vigdis Olden, Antonio Alvaro, Jianying He, Zhiliang Zhang
Summary: A general simulation framework for modelling ductile-to-brittle transition in metals is proposed in this study. By combining the complete Gurson model and cohesive zone model, the competition mechanism between fracture due to micro-void growth and coalescence and fracture in the cohesive zone is demonstrated. It is found that the fracture mode depends on the ratio between the cohesive strength and the yield strength of the material. This research is significant for understanding failure scenarios associated with ductile-to-brittle transition.
ENGINEERING FRACTURE MECHANICS
(2022)
Article
Engineering, Mechanical
Shi Hu, Jianwei Li, Quanyi Liu, Yuanhua He
Summary: In this study, the nanoscale crack propagation behavior in the presence of nonlinear disturbance strains was investigated using the phase-field-crystal method. The influences of amplitude A and frequency omega on fracture mode and crack growth were discussed, showing that the disturbance strains could induce transitions between brittle and ductile fracture modes. The results also revealed that increasing frequency omega can lead to a brittle-to-ductile transition (BDT), while further increasing omega can cause a ductile-to-brittle transition (DBT), with the amplitude A affecting the critical frequencies for these transitions. Additionally, crack growth was found to be influenced by the disturbance strains, with smaller omega accelerating crack growth and larger omega requiring an increase in A to retard it. Through this work, a new approach for effectively exploring the nanoscale mechanism and behavior of crack propagation was provided.
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2021)
Article
Nanoscience & Nanotechnology
Xinghao Wei, Xue Cao, J. H. Luan, Z. B. Jiao, C. T. Liu, Z. W. Zhang
Summary: A high strength steel with similar to 930 MPa yield strength and excellent low temperature toughness has been developed. The steel consists of a fine lath martensite with rod-like Cu precipitates. The high strength is achieved through a combination of solid-solution strengthening, dislocation strengthening, grain boundary strengthening, and precipitation strengthening of Cu-precipitates. The instrumented Charpy impact results indicate that the crack propagation is the main factor affecting the ductile brittle transition temperature (DBTT) while the dislocation density affects both crack initiation and propagation. The fine lath structure of the low carbon martensite enhances crack resistance and delays rapid crack propagation at low temperatures. The strengthening and toughening mechanisms are thoroughly discussed.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Chemistry, Physical
Song Huang, Hu Hui, Jian Peng
Summary: This work presents a novel strategy to model the coexistence of HELP & HEDE mechanisms, using a competitive fracture criterion to describe ductile and brittle damage and a dislocation-enhanced hydrogen accumulation model to address the cooperation aspect.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Multidisciplinary
Jiaqing Li, Cheng Lu, Long Wang, Linqing Pei, Ajit Godbole, Guillaume Michal
Summary: This study utilized molecular dynamics simulations to investigate the influence of hydrogen segregation on intergranular crack behavior in bicrystalline nanowires. Results showed that the effects of hydrogen atoms on intergranular cracks depend on the crack type, with hydrogen either promoting or weakening crack propagation.
Article
Physics, Fluids & Plasmas
J. S. Langer
Summary: This paper attempts to construct a first-principles theory of the fracture toughness of crystalline solids based on the thermodynamic dislocation theory. The analysis results show that the theory's predictions quantitatively agree with experimental data, including both brittle and ductile fracture under various conditions.
Article
Mechanics
Zhuang Chen, Diansen Yang, Hanbing Bian
Summary: This paper presents a peridynamic hydrogen embrittlement model that is capable of simulating hydrogen diffusion and hydrogen embrittlement phenomena. The effectiveness of the model is validated through numerical examples and compared to other models and experiments. The influence of hydrogen diffusion time steps and grain boundary diffusion coefficients on hydrogen-assisted crack propagation is also investigated.
ENGINEERING FRACTURE MECHANICS
(2023)
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
Chemistry, Physical
Chenghao Chen, Min Lai, Fengzhou Fang
Summary: This paper investigates the crack formation mechanism in nano-cutting of gallium arsenide, finding that the main damage changes from dislocation to phase transformation with increasing cutting speed. The amount of cracks increases with higher cutting depth, and the deformation mode turns from ductile to a combination of ductile and brittle.
APPLIED SURFACE SCIENCE
(2021)
Article
Materials Science, Ceramics
Chong Su, Hujiao Tang, Pinfang Guo, Ruiming Ren
Summary: In this study, mechanisms of ductile-brittle transition and crack damage during the grinding of plasma-sprayed alumina ceramic coatings were investigated. The results showed that brittle damage modes include boundary cracks, median cracks, and lateral fractures. The normal force of the abrasive grain initiates median cracks, while the tangential force propagates them. The geometry and cutting depth of the abrasive grain significantly influence the transition, while the cutting speed has no significant influence. Stress concentration at pore defects leads to crack propagation to the deep layer and reduces the local strength, resulting in brittle fracturing and interrupted crack propagation. Exposed pores and their broken morphology are important factors in reducing surface roughness. The machined surface morphology includes brittle fracturing, ductile cutting and plowing, cracks, original pores, and unmelted particles.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Jian Wang, Lv Zhao, Minsheng Huang, Yaxin Zhu, Zhenhuan Li
Summary: The presence of hydrogen in single-crystal bcc Fe was found to reduce the nucleation strength of dislocations and promote their motion. This indicates that hydrogen has a significant impact on the behavior of dislocations.
ACTA MECHANICA SOLIDA SINICA
(2022)
Article
Engineering, Mechanical
Qifan Bao, MinSheng Huang, Yaxin Zhu, Lv Zhao, Zhenhuan Li
Summary: The study reveals that the interaction between a high speed edge dislocation and a microvoid results in various dynamic effects, including repeated oscillations, release and pull forward configurations, closely related to the formation of superjog driven by the dislocation-microvoid interaction.
INTERNATIONAL JOURNAL OF PLASTICITY
(2022)
Article
Nanoscience & Nanotechnology
Lubin Song, Lv Zhao, Lipeng Ding, Yaxin Zhu, Minsheng Huang, Aude Simar, Zhenhuan Li
Summary: This study investigates the strain hardening and damage mechanisms of laser powder bed fusion AlSi10Mg under different build platform temperatures and loading directions. It was found that the microstructure size and melt pool border orientation have significant effects on the mechanical behavior of the material. The findings provide insights into the understanding of the correlation between mechanical behavior and heterogeneous microstructure.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Mechanics
Jianqiu Liu, Minsheng Huang, Zhenhuan Li, Lv Zhao, Yaxin Zhu
Summary: This study creatively designed a novel microvoid growth model based on deep neural network, which combines convolutional and long short-term memory components, successfully capturing the statistical characteristic of microvoid growth in heterogeneous polycrystals. It is expected that this deep learning-based method can provide a new approach for predicting microvoid growth at the grain-level.
ENGINEERING FRACTURE MECHANICS
(2022)
Article
Materials Science, Multidisciplinary
Juan Guillermo Santos Macias, Lv Zhao, David Tingaud, Brigitte Bacroix, Grzegorz Pyka, Camille van der Rest, Laurence Ryelandt, Aude Simar
Summary: Through simulation analysis, a 350 degrees C, 300 MPa HIP treatment is found to effectively reduce the large porosities in 3D printed materials, improving fracture strain and fatigue life. This new treatment method eliminates the need for additional post-treatments compared to the classic three-step treatment.
JOURNAL OF MATERIALS SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
Jiawei Chen, Yaxin Zhu, Minsheng Huang, Lv Zhao, Shuang Liang, Shulin Yuan, Zhenhuan Li
Summary: In this study, the distribution of hydrogen around grain boundaries and the plastic response of grain boundaries under different conditions were simulated. It was found that the influence of hydrogen on dislocation nucleation from grain boundaries depends on both tensile directions and characteristics of grain boundary structures.
MATERIALS & DESIGN
(2022)
Review
Engineering, Manufacturing
Lv Zhao, Lubin Song, Juan Guillermo Santos Macias, Yaxin Zhu, Minsheng Huang, Aude Simar, Zhenhuan Li
Summary: This review article summarizes the recent progress in the characterization of microstructure, assessment of strengthening and damage mechanisms, and evaluation of fracture and fatigue resistance of LPBF Al alloys. It aims to build a comprehensive link between mechanical performance and microstructure and provides an outlook on further efforts needed to maximize the potential of mechanical performance through optimizing microstructure.
ADDITIVE MANUFACTURING
(2022)
Article
Materials Science, Multidisciplinary
Mariia Arseenko, Florent Hannard, Lipeng Ding, Lv Zhao, Eric Maire, Julie Villanova, Hosni Idrissi, Aude Simar
Summary: Self-healing strategies for metallic systems are still under-developed, but this study proposes a new strategy based on damage localization particles that can be healed by heat treatment. The strategy was successfully validated with a commercial aluminum alloy, showing that short and low temperature heating can repair micron-sized damage.
Article
Materials Science, Multidisciplinary
Jiawei Chen, Shuang Liang, Yaxin Zhu, Lv Zhao, Minsheng Huang, Zhenhuan Li
Summary: Hydrogen ingression in metals generally leads to catastrophic failure. This study investigates the distribution of hydrogen around nickel grain boundaries and its influence on crack propagation behavior. The results show that hydrogen enhances dislocation emission from grain boundaries, while the crack tip remains sharp, leading to alternating intergranular fracture with ductile-brittle behavior.
COMPUTATIONAL MATERIALS SCIENCE
(2022)
Article
Engineering, Mechanical
Shulin Yuan, Yaxin Zhu, Lv Zhao, Shuang Liang, Minsheng Huang, Zhenhuan Li
Summary: This study develops a novel hydrogen transport model and investigates the role of plastic strain gradient in hydrogen transport. Experimental results demonstrate the crucial role of plastic strain gradient induced by grain boundary constraint in hydrogen migration and accumulation in deformed polycrystalline metals.
INTERNATIONAL JOURNAL OF PLASTICITY
(2022)
Article
Engineering, Mechanical
Jianqiu Liu, Shulin Yuan, Zhenhuan Li, Minsheng Huang, Lv Zhao, Yaxin Zhu
Summary: The study investigates the size-dependent microvoid growth in heterogeneous polycrystals. It finds that both the void-grain size ratio and absolute microvoid size significantly influence microvoid growth, resulting in two kinds of size effects. Furthermore, macroscopic stress triaxiality has a significant influence, while the Lode parameter has negligible effects. Understanding the size effect of microvoid growth from a statistical point of view is crucial in polycrystalline environments.
INTERNATIONAL JOURNAL OF PLASTICITY
(2022)
Article
Chemistry, Physical
Changwei Wang, Kangning Han, Xin Liu, Yaxin Zhu, Shuang Liang, Lv Zhao, Minsheng Huang, Zhenhuan Li
Summary: The hydrogen-vacancy interactions in CoCrFeMnNi high-entropy alloy were studied using first-principles calculations. The results show that solute hydrogen atoms reduce the vacancy formation energy but hinder the formation of vacancy clusters. This provides an explanation for the good resistance to hydrogen embrittlement observed in the alloy.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Xin Mei, Yuzhao Xu, Yaxin Zhu, Lv Zhao, Zhenhuan Li, Minsheng Huang
Summary: The interaction between edge extended dislocation and microvoids in high entropy alloys was investigated using atomistic simulations. The simulation results demonstrated that the high entropy effect, caused by multiple principal elements, significantly influenced the physical parameters, dislocation properties, and critical resolved shear stress of the alloy.
JOURNAL OF NUCLEAR MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Zhouqi Zheng, Shuang Liang, Minsheng Huang, Lv Zhao, Yaxin Zhu, Zhenhuan Li
Summary: The effects of hydrogen on dislocation mobility and operation of the Frank-Read source are evaluated using a phase-field model. Short-range hydrogen-dislocation interaction impedes dislocation motion, while long-range elastic hydrogen shielding effect has the opposite effect. Hydrogen decreases the critical nucleation stress of the Frank-Read source and enhances hydrogen-induced plasticity. The modification of the dislocation core structure due to short-range interaction plays an important role in understanding the mechanism of hydrogen-enhanced localized plasticity.
MECHANICS OF MATERIALS
(2022)
Article
Engineering, Mechanical
Jianchang Zhu, Jianqiu Liu, Minsheng Huang, Zhenhuan Li, Lv Zhao
Summary: This study investigates the orientation effect on void growth in polycrystals by considering different void-grain boundary (GB) relative positions. The results show that the mechanism for orientation effect on void growth in single crystals is not preserved in polycrystals. The statistical analysis reveals that the void growth distribution is closely associated with the void-GB relative position. This study provides deeper insights into the mechanism of damage evolution in polycrystalline metals.
INTERNATIONAL JOURNAL OF PLASTICITY
(2022)
