Article
Chemistry, Physical
Mahdieh Safyari, Masoud Moshtaghi, Shigeru Kuramoto, Tomohiko Hojo
Summary: In this study, the hydrogen trap sites and binding energies in an Al-Cu-Mg alloy with different microstructures were investigated to understand the environmental hydrogen embrittlement behavior. The results show that the density and nature of trap sites can determine the susceptibility of the alloy to environmental hydrogen embrittlement.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Materials Science, Multidisciplinary
Rakesh Kumar, Dhiraj K. Mahajan
Summary: In this study, a coupled framework of dislocation density-based crystal plasticity model and slip-rate based hydrogen transport model is developed to simulate hydrogen-assisted damage at the deforming crack-tip. The evolving hydrogen concentration is accounted for by chemical potential-based boundary conditions and mobile dislocation-assisted hydrogen transport. A novel fracture indicator parameter is proposed to quantify the damage, considering the combined effect of local hydrogen concentration, accumulated plastic slip, and stress triaxiality. Depending on the crystal orientation, the damage is shown to be associated either with an individual hydrogen embrittlement mechanism (hydrogen-enhanced localized plasticity and hydrogen-enhanced decohesion) or their synergistic effect at the crack tip.
MECHANICS OF MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Xingyuan Mei, Yu Yan, Lijie Qiao
Summary: This study systematically clarifies the dominant factors in hydrogen embrittlement (HE) of maraging steels in different aging states using experiments and numerical simulations. The interfacial properties of coherent & omega;/matrix interfaces and semi-coherent & eta;-Ni3Ti/matrix interfaces are the key factors affecting trap density and hydrogen diffusion, leading to variations in HE susceptibility. The improvement in ductility by reverted austenite further reduces HE susceptibility.
Editorial Material
Chemistry, Physical
Vasily Bulatov, Wei Cai
Summary: The in situ electron microscopy study provides important insights into the enhanced dislocation mobility in iron and contributes to the ongoing debate on hydrogen embrittlement mechanisms.
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
Lanxi Feng, Xiaoqing Zhang, Wanghui Li, Meizhen Xiang, Xiaohu Yao
Summary: Hydrogen embrittlement in metals has long been a concern, but the fundamental mechanisms in dynamic events are not well understood. Atomic simulations reveal the anisotropic effects of hydrogen atoms on spall strength in different crystal orientations. Hydrogen atoms prevent phase transition and enhance spall strength in [100] crystal orientation, while in [111] crystal orientation, hydrogen atoms promote dislocation formations and lower spall strength. In nanocrystalline samples, hydrogen atoms slightly increase spall strength by disturbing grain boundaries. This work provides insights into hydrogen effects on metals under dynamic loading, benefiting materials and mechanics research communities.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Chemistry, Multidisciplinary
Evan D. Sherwin, Ernest Lever, Adam R. Brandt
Summary: Natural gas distribution systems play a significant role in the US energy consumption, but as the system moves towards decarbonization, understanding the response of existing infrastructure to new operational modes becomes crucial. Opportunistic sampling can reduce data collection costs if it represents the entire asset base. Analysis of a dataset from a large natural gas distribution utility suggests that sampling locations affected by excavation damage can provide representative estimates of key characteristics across the asset base. This sampling approach can help utilities gather necessary data for a safe and reliable transition to a lower-emission system.
Article
Materials Science, Multidisciplinary
Jiaqing Li, Ziyue Wu, Lijie Zhu, Zhuwu Zhang, Lin Teng, Liang Zhang, Cheng Lu, Rui Wang, Che Zhang
Summary: The influence of temperature on hydrogen diffusion and hydrogen embrittlement of X80 steel was studied. The results showed that the hydrogen diffusion and subsurface hydrogen concentration in the steel increased with increasing temperature. Macro slow strain rate tensile tests and microstructural analysis revealed a temperature threshold THE, max of 315 K for hydrogen-induced embrittlement susceptibility. The determination of THE, max is crucial for determining test temperatures in hydrogen-related engineering material applications.
Article
Engineering, Mechanical
A. Diaz, I. I. Cuesta, C. Rodriguez, J. M. Alegre
Summary: Hydrogen assisted fracture near welds is the result of a combination of microstructural changes and the accumulation of hydrogen. The simulation results show that there is a higher hydrostatic peak and lattice hydrogen increase for the HAZ-centred crack. A two-type trapping process is also simulated to reproduce the effect of dislocation trapping and micro-structure delayed diffusion.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2021)
Review
Chemistry, Physical
Linshuo Dong, Shuize Wang, Guilin Wu, Junheng Gao, Xiaoye Zhou, Hong-Hui Wu, Xinping Mao
Summary: This study summarizes recent advances in using atomic simulations to understand the interaction between hydrogen atoms and various defects in iron-based alloys. The challenges and advantages of atomic simulations in revealing hydrogen-related behaviors and interaction mechanisms are discussed. The article also highlights scientific issues and future research directions in this field.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Materials Science, Multidisciplinary
Touko Lehankari, S. Assa Aravindh, Wei Cao, Matti Alatalo, Marko Huttula, Jukka Komi
Summary: Iron aluminide compounds have excellent properties but defects can reduce material strength and ductility. This study found that defects at FeAl grain boundaries can form defect complexes with hydrogen impurities, leading to decreased formation energies and decreased material strength.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2021)
Article
Materials Science, Multidisciplinary
Yu Chen, Yin Zhang, Dengke Chen
Summary: Hydrogen-dislocation interactions play a crucial role in understanding hydrogen embrittlement phenomena in metallic materials. Through calculations and simulations, the effects of hydrogen atoms on dislocation nucleation and shear stress are revealed.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Jinwoo Kim, Dylan Hall, Haoxue Yan, Yitong Shi, Sudha Joseph, Sarah Fearn, Richard J. Chater, David Dye, C. Cem Tasan
Summary: It was found that roughening the surface of Ti-6Al-4V can significantly reduce hydrogen uptake and enhance its resistance against hydrogen embrittlement.
Article
Materials Science, Multidisciplinary
Yuhao Wang, Haijun Wang, Lingxiao Li, Jiyan Liu, Pei Zhao, Zhiqiang Xu
Summary: This study investigates the effect of grain boundaries on hydrogen atom diffusion in aluminum alloys using molecular dynamics simulations. The results reveal that at low hydrogen concentrations, grain boundaries can capture and hinder the diffusion of hydrogen atoms, whereas at high hydrogen concentrations, grain boundaries do not affect the diffusion rate of hydrogen atoms.
Article
Materials Science, Multidisciplinary
Saya Ajito, Tomohiko Hojo, Motomichi Koyama, Sachiko Hiromoto, Eiji Akiyama
Summary: The environment-assisted cracking behavior of AZ31 magnesium alloy was studied through tensile tests in a Na2B4O7·10H2O solution containing NH4SCN and in air at cathodic and corrosion potentials. Mechanical properties of AZ31 were unaffected by the environment at an initial strain rate of 10-4s-1, but degraded in the solution at an initial strain rate of 10-6s-1. Higher potentials resulted in smaller total elongation, while positive potential shift increased the average hydrogen absorption rate. These findings indicate that environment-assisted cracking becomes more severe under relatively high potential due to corrosion and enhanced hydrogen absorption.
Article
Materials Science, Multidisciplinary
A. Tehranchi, B. Yin, W. A. Curtin
PHILOSOPHICAL MAGAZINE
(2017)
Article
Materials Science, Multidisciplinary
A. Tehranchi, W. A. Curtin
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2017)
Article
Materials Science, Multidisciplinary
A. Tehranchi, W. A. Curtin
MODELLING AND SIMULATION IN MATERIALS SCIENCE AND ENGINEERING
(2017)
Article
Materials Science, Multidisciplinary
A. Tehranchi, B. Yin, W. A. Curtin
Article
Materials Science, Multidisciplinary
Claas Hueter, Pratheek Shanthraj, Eunan McEniry, Robert Spatschek, Tilmann Hickel, Ali Tehranchi, Xiaofei Guo, Franz Roters
Article
Computer Science, Interdisciplinary Applications
M. Mofid, A. Tehranchi, A. Ostadhossein
ADVANCES IN ENGINEERING SOFTWARE
(2010)
Article
Mechanics
H. M. Shodja, F. Ahmadpoor, A. Tehranchi
JOURNAL OF APPLIED MECHANICS-TRANSACTIONS OF THE ASME
(2012)
Article
Materials Science, Multidisciplinary
H. M. Shodja, A. Zaheri, A. Tehranchi
MECHANICS OF MATERIALS
(2013)
Article
Materials Science, Multidisciplinary
H. M. Shodja, A. Tehranchi
PHILOSOPHICAL MAGAZINE
(2010)
Article
Materials Science, Multidisciplinary
A. Tehranchi, X. Zhou, W. A. Curtin
Article
Physics, Multidisciplinary
Xiao Zhou, Ali Tehranchi, William A. Curtin
Summary: The urgent need for clean energy and the exceptional promise of hydrogen as a clean fuel are driving the development of new metals resistant to hydrogen embrittlement. New experiments on fcc high entropy alloys suggest a paradox where these alloys absorb more H than traditional metals like Ni or SS304 while being more resistant to embrittlement, and a new theory has been proposed to rationalize this phenomenon. The theory has been able to quantitatively predict the hydrogen concentration at which embrittlement occurs and sheds light on the resistance mechanisms of different alloys.
PHYSICAL REVIEW LETTERS
(2021)
Article
Engineering, Multidisciplinary
Dengshan Zhou, Xiuzhen Zhang, Ali Tehranchi, Junhua Hou, Wenjun Lu, Tilmann Hickel, Dirk Ponge, Dierk Raabe, Deliang Zhang
Summary: Stacking faults (SFs) can be used to increase the strength and ductility of metal matrix composites. However, SFs are rarely observed in Al alloy matrix composites. In this study, SFs are introduced into an ultrafine-grained Al(Mg)-Al3Mg2 composite, resulting in improved yield strength and tensile elongation.
COMPOSITES PART B-ENGINEERING
(2022)
Article
Materials Science, Multidisciplinary
Xizhen Dong, Dong Wang, Prithiv Thoudden-Sukumar, Ali Tehranchi, Dirk Ponge, Binhan Sun, Dierk Raabe
Summary: This study investigates the interplay between hydrogen-related decohesion and localized plasticity in the failure of a high-Mn, high-Al lightweight steel. It is found that hydrogen embrittlement occurs through intergranular cracking along austenite-ferrite phase boundaries and transgranular cracking inside the ferrite.
Article
Engineering, Multidisciplinary
H. M. Shodja, A. Ordookhani, A. Tehranchi
Summary: This paper investigates the scattering of SH-waves by a heterogeneous magneto-electro-elastic (MEE) scatterer embedded in an unbounded medium. The scatterer consists of a core and encapsulator with distinct MEE properties. The study employs fully coupled partial differential equations and Green's function equations to describe the fields in different regions. A rigorous analytical method called the dynamic magneto-electro-mechanical equivalent inclusion method (DMEMEIM) is developed to solve the problem. The results show that the magnetic field has a significant effect on the scattering cross-section and the interfacial stresses are influenced by both eccentricity and magnetic parameters.
JOURNAL OF ELASTICITY
(2023)
Article
Mechanics
Xiaolong Liu, Kelian Luo, Pengcheng Gao, Tao Cong, Xi Wang, Wenjing Wang
Summary: This paper investigates the formation mechanisms of the zig-zag crack region on the shattered rim of railway wheels. The zig-zag crack region, identified as a typical region for crack propagation in rolling contact fatigue behavior, was observed using scanning electron microscopy and transmission electron microscopy. The formation of the zig-zag morphology is attributed to the periodic deflection of the propagation path relative to the initial propagation plane, caused by the limited plastic deformation zone at the crack tip. Grain refinement and secondary cracks in the zig-zag crack region are a result of the large compressive and shear stresses induced by rolling contact loading.
ENGINEERING FRACTURE MECHANICS
(2024)
Article
Mechanics
Anastasia Iziumova, Aleksei Vshivkov, Ivan Panteleev, Virginia Mubassarova, Oleg Plekhov, Denis Davydov
Summary: The aim of this study was to investigate the correlation between structural, acoustic emission, and thermal characteristics of fatigue crack growth in titanium alloys. Cluster analysis of the acoustic emission signals revealed two different types of signals observed during the fatigue crack development. It was experimentally demonstrated that the stored energy tends to reach an asymptotic value at the final stage of fatigue crack growth and this is correlated with the twinning process intensification in titanium alloy Ti Grade 2. A correlation was assumed between the stages of change in heat flux, the cumulative energy of the first cluster of acoustic emission signals, and the crack length.
ENGINEERING FRACTURE MECHANICS
(2024)
Article
Mechanics
M. Vieira de Carvalho, I. A. Rodrigues Lopes, F. M. Andrade Pires
Summary: This study investigates the numerical challenges of fracture mechanics models within implicit quasi-static frameworks and proposes an instability criterion. The ratio of cohesive to internal power is identified as a crucial factor. Two strategies for handling fracture problems with instabilities are discussed and a comparative assessment is performed. The study also examines more complex material responses, including transformation-induced plasticity effects.
ENGINEERING FRACTURE MECHANICS
(2024)
Article
Mechanics
Thomas Duminy, Aurelien Doitrand, Sylvain Meille
Summary: This study conducted in situ wedge splitting tests on millimeter-size PMMA samples and proposed a method to determine the material tensile strength and critical energy release rate using digital image correlation and a full finite element implementation of the coupled criterion.
ENGINEERING FRACTURE MECHANICS
(2024)
Article
Mechanics
Xin Chang, Xingyi Wang, Chunhe Yang, Yintong Guo, Yanghui Wan
Summary: The influence of cyclic thermal shock and high-temperature acid etching on the Mode I fracture of shale was investigated in this study. It was found that cyclic thermal shock severely degrades the strength and fracture toughness of shale, while high-temperature acid etching treatment improves the fracture toughness. These findings are valuable for optimizing process parameters to reduce initiation pressure in deep shale formations.
ENGINEERING FRACTURE MECHANICS
(2024)
Article
Mechanics
Liaojun Yao, Mingyue Chuai, Zhangming Lyu, Xiangming Chen, Licheng Guo, R. C. Alderliesten
Summary: Methods based on fracture mechanics have been widely used in fatigue delamination growth (FDG) characterization of composite laminates. This study proposes appropriate similitude parameters to represent FDG behavior with different R-ratios.
ENGINEERING FRACTURE MECHANICS
(2024)
Article
Mechanics
Zesheng Zang, Zhonghui Li, Yue Niu, Shan Yin
Summary: This study conducted experiments and recorded signals to investigate the fracture behavior and damage evolution characteristics of coal samples. The results showed that as loading proceeds, the stress, electric potential (EP), and acoustic emission (AE) values increase, and EP and AE signals are excited when stress drops. The fracture behavior of coal samples is altered by flaw inclination, and the destruction mode becomes increasingly complicated. The damage evolution characteristics of coal samples can be evaluated and analyzed by defining the coefficient of variation (CV value) of EP and the b value of AE.
ENGINEERING FRACTURE MECHANICS
(2024)
Article
Mechanics
Clotilde Berdin, Nathalie Prud'homme
Summary: In this study, zirconia layers with different fractions of tetragonal phase and thicknesses were tested for multi-cracking behavior. Cracks perpendicular to the tensile direction were observed, showing a blunting effect into the substrate. The ratio of crack spacing at saturation to layer thickness decreased as the layer thickness increased. Unit cell modeling was used to establish a relationship between crack spacing and layer strength, which fell within the bounds of Hu and Evans model and was found to be insensitive to the tetragonal zirconia fraction.
ENGINEERING FRACTURE MECHANICS
(2024)
Article
Mechanics
Huadong Zhang, Weichen Kong, Y. H. Liu, Yuh J. Chao
Summary: Williams' series expansion crack tip solution in linear elasticity is modified to include a uniform crack face pressure. Practical methods to calculate T-stress from near crack tip stresses are outlined. The analytical results are consistent with numerical results.
ENGINEERING FRACTURE MECHANICS
(2024)
Article
Mechanics
Jiahao Kong, Haoyue Han, Tao Wang, Guangyan Huang, Zhuo Zhuang
Summary: This paper introduces a phase-field model for polymer foam materials by combining the phase-field method with the crushable foam model. The model is calibrated using experimental data and successfully simulates the fracture processes of polyurethane under different loading conditions. The study is important for the engineering applications of polymer foam materials.
ENGINEERING FRACTURE MECHANICS
(2024)