Article
Nanoscience & Nanotechnology
Rama Srinivas Varanasi, Motomichi Koyama, Yuki Shibayama, Eiji Akiyama
Summary: The present work investigates the fracture mechanisms in a dual-phase steel and reveals the dominant brittle fracture contrary to conventional wisdom. The crack initiation occurs via martensite cracking along the prior austenite grain boundaries, while the crack propagation in ferrite primarily occurs via brittle cleavage cracking. The study also clarifies the micro mechanisms associated with the sharp and blunt martensite cracks and occasional ductile ferrite fracture.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Mechanics
Anssi Laukkanen, Sampo Uusikallio, Matti Lindroos, Tom Andersson, Jukka Komi, David Porter
Summary: Ferritic-austenitic duplex stainless steels are preferred for their good mechanical properties and corrosion resistance, with current research focusing on micro-scale analysis of cleavage fracture behavior to enhance cleavage resistance. Investigations suggest that the fraction and morphology of austenite play a critical role in improving fracture toughness.
ENGINEERING FRACTURE MECHANICS
(2021)
Article
Materials Science, Multidisciplinary
Tingshu Chen, Takahiro Chiba, Motomichi Koyama, Eiji Akiyama, Kenichi Takai
Summary: Intergranular fracture is the primary mode of fracture in lath martensitic steels with a significant amount of hydrogen. With a reduction in hydrogen content, plasticity plays a significant role in the intergranular fracture, leading to intergranular-like fracture. Intergranular fracture occurs in the macroscopically elastic regime, while intergranular-like fracture involves plasticity evolution, resulting in the formation of nano-voids and tear ridges.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2022)
Article
Construction & Building Technology
Farzad Hejazi, Hogr Karim, Hamid Kazemi, Shahriar Shahbazpanahi, Amir Mosavi
Summary: In this paper, a numerical model based on nonlinear fracture mechanics is developed to study the propagation of cracks in CFRP-strengthened connections. Experimental results showed that the CFRP sheets prevented crack propagation in the beam, enhancing the stability of the connection.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2022)
Article
Engineering, Mechanical
Chaoping Jiang, Hongchuan Ma, Yongnan Chen, Nan Wang, Qinyang Zhao, Gang Wu, Lixia Zhu, Jinheng Luo, Yongqing Zhao
Summary: This study investigates the crack propagation behavior and mechanism of dual-phase steel under low temperature conditions. The results show that the strength of dual-phase steel increases while the fracture toughness decreases at low temperatures. The reduction in plastic zone size at the crack-tip causes extreme sensitivity to ambient temperature. Additionally, the fracture of dual-phase steel presents transgranular fracture along specific crystal planes due to the accumulation of dislocation density.
INTERNATIONAL JOURNAL OF FATIGUE
(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
Engineering, Mechanical
Longbang Qing, Yile Wang, Mingqi Li, Ru Mu
Summary: Aligned and random steel fiber reinforced cementitious composites (ASFRC, SFRC) were prepared to investigate the influence of fiber orientation and volume fraction on the fatigue life and fracture behavior of composites. The experimental results showed that the fatigue life of ASFRC was more than 8 times longer than that of SFRC. Compared to SFRC, ASFRC exhibited an increase of over 17% in the critical effective crack length, allowing for greater deformation and crack propagation. Furthermore, a two-parameters fracture model considering the fiber volume fraction (Vf) was developed based on the experimental results to predict the fatigue life.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Engineering, Marine
Jingxia Yue, Jiankang Lei, Yordan Garbatov, Ke Yang
Summary: Many studies have found limitations in the linear elastic fracture mechanics method based on the stress intensity factor range, as it neglects the influence of plastic deformation near the crack tip. In this study, a new fracture behavior assessment approach for marine structures is proposed, which uses the crack tip opening displacement range based on elastic-plastic fracture mechanics. The results show that this approach accurately describes crack propagation behavior and has a wider application range compared to traditional models.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Materials Science, Multidisciplinary
Zhou Li, Y. C. Lin, Lu Zhang, Fanghui Jia, Zhengyi Jiang, Sihai Jiao
Summary: This study investigated the crack growth behavior at the interfacial zone of a hot-rolled bimetal composite and obtained variations in fracture force under different loading speeds and directions using a micro tensile machine. The results indicate that the crack propagation direction and loading speed have a significant influence on the interfacial behavior, while their impact on the CTOD and yield zone size of the composite is relatively small.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Mechanics
Y. Liu, F. P. van der Meer, L. J. Sluys, L. Ke
Summary: The mode-I dynamic fracture energy and failure mechanisms of glass fiber-reinforced polymer composites were investigated using an embedded cell model of the single-edge-notched-tension (SENT) geometry. It was found that with increasing strain rates, the composite material exhibited increased brittleness, with limited plasticity in the fracture process zone. The crack growth was dominated by a velocity-toughness mechanism after the fracture process zone was fully developed.
ENGINEERING FRACTURE MECHANICS
(2021)
Article
Mechanics
Quanxin Jiang, Virginia M. Bertolo, Sakari Pallaspuro, Vera Popovich, Jilt Sietsma, Carey L. Walters
Summary: Multi-barrier cleavage models consider the fracture characterized by a series of microscale events. However, there are strong variations of cleavage parameters across different types of steels which have not been systematically studied. In this paper, cleavage parameters for different steels are determined and it is found that the parameters depend on particle morphology, composition, and hierarchical grain structure. The determined values of the cleavage parameters are consistent among the different steels, allowing for further application in microstructure design for controlling macroscopic toughness.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Materials Science, Multidisciplinary
S. B. Zhou, F. Hu, W. Zhou, L. Cheng, C. Y. Hu, K. M. Wu
Summary: The presence of retained austenite has a significant impact on the crack propagation behavior of submicron-structured bainitic steel under impact fracture conditions. The content, distribution, and microstructure of retained austenite influence the impact toughness and initiation/propagation of cracks.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Nanoscience & Nanotechnology
Rakesh Kumar Barik, Sankalp Biswal, Khilesh Kumar Bhandari, Abhijit Ghosh, Debalay Chakrabarti
Summary: This study investigates the micro-mechanisms of cleavage fracture in a low carbon ferritic steel through EBSD crack path analysis and molecular dynamics fracture simulation. The experimental results reveal that the {100} crystallographic plane is the predominant cleavage plane, with occasional cracking along the secondary {110} cleavage plane. Cracking along the {110} plane is particularly feasible when the {100} planes within a grain exhibit significant twist angles with the preceding crack plane. The fracture also results in the formation of tongue-like features on the fracture surface, which is attributed to intermittent nucleation of symmetric {112}<111> type twins across the crack front.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
W-S Lei, G. Qian, Z. Yu, P. Zhang
Summary: The study analyses cleavage fracture toughness of ferritic steels measured from different sized fracture mechanics specimens at different temperatures using the standardized Weibull distribution function. The Weibull modulus was estimated to range from 1.83 to 2.55, showing strong temperature dependence of the threshold cleavage fracture toughness K-min. The goodness of fit test validated the use of Weibull distribution function for describing toughness distribution.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2021)
Article
Nanoscience & Nanotechnology
Akinobu Shibata, Ivan Gutierrez-Urrutia, Kazuho Okada, Goro Miyamoto, Yazid Madi, Jacques Besson, Kaneaki Tsuzaki
Summary: The study investigated the relationship between the mechanical response and microscopic crack propagation behavior of hydrogen-related intergranular fractures in high-strength martensitic steel. The results showed that hydrogen can affect crack tip morphology and induce strain localization in the vicinity of intergranular cracks.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Editorial Material
Mechanics
S. Xu, C. Bassindale, B. W. Williams, X. Wang, R. Tyson, K. Shibanuma
ENGINEERING FRACTURE MECHANICS
(2019)
Article
Mechanics
Fuminori Yanagimoto, Kazuki Shibanuma, Katsuyuki Suzuki, Toshiyuki Matsumoto
ENGINEERING FRACTURE MECHANICS
(2019)
Article
Engineering, Mechanical
Hiroaki Ito, Yuta Suzuki, Hideaki Nishikawa, Masao Kinefuchi, Manabu Enoki, Kazuki Shibanuma
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2020)
Article
Engineering, Mechanical
Kota Kishi, Fuminori Yanagimoto, Tsutomu Fukui, Toshiyuki Matsumoto, Kazuki Shibanuma
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2020)
Review
Engineering, Marine
Tomoya Kawabata, Takehiro Inoue, Tetsuya Tagawa, Tsutomu Fukui, Yasuhito Takashima, Kazuki Shibanuma, Shuji Aihara
Article
Engineering, Multidisciplinary
Kota Kishi, Yuuki Takeoka, Tsutomu Fukui, Toshiyuki Matsumoto, Katsuyuki Suzuki, Kazuki Shibanuma
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2020)
Article
Engineering, Mechanical
Ji-Su Kim, Yun-Jae Kim, Myeong-Woo Lee, Ki-Seok Kim, Kazuki Shibanuma
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2020)
Article
Engineering, Civil
Tsunehisa Handa, Tetsuya Tagawa, Yusuke Shimada, Tomoya Kawabata, Takehiro Inoue, Masahito Kaneko, Kei Sugimoto, Shuji Aihara, Kazuki Shibanuma
INTERNATIONAL JOURNAL OF OFFSHORE AND POLAR ENGINEERING
(2020)
Article
Engineering, Mechanical
Ji-Su Kim, Yun-Jae Kim, Myeong-Woo Lee, Ki-Seok Kim, Kazuki Shibanuma
Summary: This paper proposes a method to simultaneously simulate interacting ductile and cleavage fracture in a DWTT, using stress-modified fracture strain (SMFS) damage model for ductile fracture and maximum principal stress criterion for cleavage fracture. By incorporating the element size effect in the ductile and cleavage damage models, a numerical method is constructed to simulate the interacting ductile and cleavage fracture behavior in a DWTT. Validation with experimental data shows good agreement between the simulation results and measurements.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2021)
Article
Mechanics
Ji-Su Kim, Yun-Jae Kim, Myeong-Woo Lee, Ki-Seok Kim, Kazuki Shibanuma
Summary: This paper proposes a numerical method to characterize the probabilistic energy distributions of DWTTs at ductile-brittle transition temperatures, and validates the effectiveness of the method by comparing with experimental data.
ENGINEERING FRACTURE MECHANICS
(2022)
Article
Engineering, Mechanical
Hongchang Zhou, Zijie Liu, Masao Kinefuchi, Kazuki Shibanuma
Summary: A multiscale modelling strategy is proposed for predicting fatigue lives and limits of steels, which is based on a general method for evaluating the effects of grain boundaries on fatigue crack growth. The strategy is validated through experiments on different types of steels and shown to accurately predict fatigue lives and limits.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
Article
Engineering, Mechanical
Shengwen Tu, Shota Suzuki, Zhuocheng Yu, Kazuki Shibanuma
Summary: This paper proposes a strategy to efficiently identify the required parameters of ductile fracture models in metallic materials using a hybrid experimental-numerical procedure. The strategy only requires two types of experiments, conventional tensile test and crack growth test, and all the parameters can be determined through numerical optimizations. The experimental results show the feasibility and accuracy of the proposed strategy in parameter identification.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2022)
Article
Engineering, Multidisciplinary
Kazuki Shibanuma, Kota Kishi, Tianyu He, Naoki Morita, Naoto Mitsume, Tsutomu Fukui
Summary: This paper proposes a strategy based on the s-version finite element method for analyzing dynamic crack propagation in 3D solids to accurately simulate local stress. By using an ideal structured mesh and nodal force release method, the strategy achieves unprecedented accuracy and efficiency.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2022)
Article
Materials Science, Multidisciplinary
Kazuki Shibanuma, Shengwen Tu, Shota Suzuki, Zhuocheng Yu, Ryoma Kato, Asato Hatamoto
Summary: To ensure the integrity of advanced thin sheet metals in engineering applications, it is important to understand their ductile crack propagation behavior. This study comprehensively investigated the governing factors for ductile crack propagation paths in sheet metals through experiments and numerical simulations. The results confirmed that strain hardening ability and ductility diagram parameter play dominant roles in controlling ductile crack propagation.
MATERIALS & DESIGN
(2022)
Article
Engineering, Multidisciplinary
Tianyu He, Naoto Mitsume, Fumitaka Yasui, Naoki Morita, Tsutomu Fukui, Kazuki Shibanuma
Summary: In this study, a strategy based on the s-version finite element method (S-method) is proposed to accurately and efficiently model the internal traction-free boundary of a solid body. Three methods, FCM-based, IBM-based, and XFEM-based, are introduced to solve the limitations of the conventional method. The XFEM-based method demonstrates significantly higher accuracy and successfully solves the clarified issue, effectively utilizing the intrinsic strengths of the S-method.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2023)
Article
Materials Science, Multidisciplinary
Y. Liu, K. Zweiacker, C. Liu, J. T. McKeown, J. M. K. Wiezorek
Summary: The evolution of rapid solidification microstructure and solidification interface velocity of hypereutectic Al-20at.%Cu alloy after laser melting has been studied experimentally. It was found that the formation of microstructure was dominated by eutectic, alpha-cell, and banded morphology grains, and the growth modes changed with increasing interface velocity.
Article
Materials Science, Multidisciplinary
Bharat Gwalani, Julian Escobar, Miao Song, Jonova Thomas, Joshua Silverstein, Andrew Chihpin Chuang, Dileep Singh, Michael P. Brady, Yukinori Yamamoto, Thomas R. Watkins, Arun Devaraj
Summary: Castable alumina forming austenitic alloys exhibit superior creep life and oxidation resistance at high temperatures. This study reveals the mechanism behind the enhanced creep performance of these alloys by suppressing primary carbide formation and offers a promising alloy design strategy for high-temperature applications.
Article
Materials Science, Multidisciplinary
Jian Song, Qi Zhang, Songsong Yao, Kunming Yang, Houyu Ma, Jiamiao Ni, Boan Zhong, Yue Liu, Jian Wang, Tongxiang Fan
Summary: Recent studies have shown that achieving an atomically flat surface for metals can greatly improve their oxidation resistance and enhance their electronic-optical applications. Researchers have explored the use of graphene as a covering layer to achieve atomically flat surfaces. They found that high-temperature deposited graphene on copper surfaces formed mono-atomic steps, while annealed copper and transferred graphene on copper interfaces formed multi-atomic steps.
Article
Materials Science, Multidisciplinary
Jennifer A. Glerum, Jon-Erik Mogonye, David C. Dunand
Summary: Elemental powders of Al, Ti, Sc, and Zr are blended and processed via laser powder-bed fusion to create binary and ternary alloys. The microstructural analysis and mechanical testing show that the addition of Ti results in the formation of primary precipitates, while the addition of Sc and Zr leads to the formation of fine grain bands. The Al-0.25Ti-0.25Zr alloy exhibits comparable strain rates to Al-0.5Zr at low stresses, but significantly higher strain rates at higher stresses during compressive creep testing. Finite element modeling suggests that the connectivity of coarse and fine grain regions is a critical factor affecting the creep resistance of the alloys.
Article
Materials Science, Multidisciplinary
P. Jannotti, B. C. Hornbuckle, J. T. Lloyd, N. Lorenzo, M. Aniska, T. L. Luckenbaugh, A. J. Roberts, A. Giri, K. A. Darling
Summary: This work characterizes the thermo-mechanical behavior of bulk nanocrystalline Cu-Ta alloys under extreme conditions. The experiments reveal that the alloys exhibit unique mechanical properties, behaving differently from conventional nanocrystalline Cu. They do not undergo grain coarsening during extrusion and exhibit behavior similar to coarse-grained Cu.
Article
Materials Science, Multidisciplinary
Yiqing Wei, Jingwei Li, Daliang Zhang, Bin Zhang, Zizhen Zhou, Guang Han, Guoyu Wang, Carmelo Prestipino, Pierric Lemoine, Emmanuel Guilmeau, Xu Lu, Xiaoyuan Zhou
Summary: This study proposes a new strategy to modify microstructure by phase regulation, which can simultaneously enhance carrier mobility and reduce lattice thermal conductivity. The addition of Cu in layered SnSe2 induces a phase transition that leads to increased grain size and reduced stacking fault density, resulting in improved carrier mobility and lower lattice thermal conductivity.
Article
Materials Science, Multidisciplinary
Jia Chen, Zhengyu Zhang, Eitan Hershkovitz, Jonathan Poplawsky, Raja Shekar Bhupal Dandu, Chang-Yu Hung, Wenbo Wang, Yi Yao, Lin Li, Hongliang Xin, Honggyu Kim, Wenjun Cai
Summary: In this study, the structural origin of the pH-dependent repassivation mechanisms in multi-principal element alloys (MPEA) was investigated using surface characterization and computational simulations. It was found that selective oxidation in acidic to neutral solutions leads to enhanced nickel enrichment on the surface, resulting in reduced repassivation capability and corrosion resistance.
Article
Materials Science, Multidisciplinary
X. Y. Xu, C. P. Huang, H. Y. Wang, Y. Z. Li, M. X. Huang
Summary: The limited slip systems of magnesium (Mg) and its alloys hinder their wide applications. By conducting tensile straining experiments, researchers discovered a rate-dependent transition in the dislocation mechanisms of Mg alloys. At high strain rates, glissile dislocations dominate, while easy-glide dislocations dominate at low strain rates. Abundant glissile dislocations do not necessarily improve ductility.
Article
Materials Science, Multidisciplinary
M. S. Szczerba, M. J. Szczerba
Summary: Inverse temperature dependences of the detwinning stress were observed in face-centered cubic deformation twins in Cu-8at.%Al alloy. The detwinning stress increased with temperature when the pi detwinning mode was involved, but decreased when the pi/3 mode was involved. The dual effect of temperature on the detwinning stress was due to the reduction of internal stresses pre-existing within the deformation twins. The complete reduction of internal stresses at about 530 degrees C led to the equivalence of the critical stresses of different detwinning modes and a decrease in the yield stress anisotropy of the twin/matrix structure.
Article
Materials Science, Multidisciplinary
Taowen Dong, Tingting Qin, Wei Zhang, Yaowen Zhang, Zhuoran Feng, Yuxiang Gao, Zhongyu Pan, Zixiang Xia, Yan Wang, Chunming Yang, Peng Wang, Weitao Zheng
Summary: The interaction between the electrode and the electric double layer (EDL) significantly influences the energy storage mechanism. By studying the popular alpha-Fe2O3 electrode and the EDL interaction, we find that the energy storage mechanism of the electrode can be controlled by modulating the EDL.
Article
Materials Science, Multidisciplinary
Matthew R. Barnett, Jun Wang, Sitarama R. Kada, Alban de Vaucorbeil, Andrew Stevenson, Marc Fivel, Peter A. Lynch
Summary: The elastic-plastic transition in magnesium alloy Mg-4.5Zn exhibits bursts of deformation, which are characterized by sudden changes in grain orientation. These bursts occur in a coordinated manner among nearby grains, with the highest burst rate observed at the onset of full plasticity. The most significant burst events are associated with twinning, supported by the observation of twinned structures using electron microscopy. The bursts are often preceded and followed by a stasis in peak movement, indicating a certain "birth size" for twins upon formation and subsequent growth at a later stage.
Article
Materials Science, Multidisciplinary
Vaidehi Menon, Sambit Das, Vikram Gavini, Liang Qi
Summary: Understanding solute segregation thermodynamics is crucial for investigating grain boundary properties. The spectral approach and thermodynamic integration methods can be used to predict solute segregation behavior at grain boundaries and compare with experimental observations, thus aiding in alloy design and performance control.
Article
Materials Science, Multidisciplinary
Feiyu Qin, Lei Hu, Yingcai Zhu, Yuki Sakai, Shogo Kawaguchi, Akihiko Machida, Tetsu Watanuki, Yue-Wen Fang, Jun Sun, Xiangdong Ding, Masaki Azuma
Summary: This study reports on the negative and zero thermal expansion properties of Cd2Re2O7 and Cd1.95Ni0.05Re2O7 materials, along with their ultra-low thermal conductivity. Through investigations of their structures and phonon calculations, the synergistic effect of local structure distortion and soft phonons is revealed as the key to achieving these distinctive properties.
Article
Materials Science, Multidisciplinary
Thomas Beerli, Christian C. Roth, Dirk Mohr
Summary: A novel testing system for miniature specimens is designed to characterize the plastic response of materials for which conventional full-size specimens cannot be extracted. The system has an automated operation process, which reduces the damage to specimens caused by manual handling and improves the stability of the test results. The experiments show that the miniature specimens extracted from stainless steel and aluminum have high reproducibility, and the results are consistent with those of conventional-sized specimens. A correction procedure is provided to consider the influence of surface roughness and heat-affected zone caused by wire EDM.
Article
Materials Science, Multidisciplinary
Rani Mary Joy, Paulius Pobedinskas, Nina Baule, Shengyuan Bai, Daen Jannis, Nicolas Gauquelin, Marie-Amandine Pinault-Thaury, Francois Jomard, Kamatchi Jothiramalingam Sankaran, Rozita Rouzbahani, Fernando Lloret, Derese Desta, Jan D'Haen, Johan Verbeeck, Michael Frank Becker, Ken Haenen
Summary: This study investigates the influence of film microstructure and composition on the Young's modulus and residual stress in nanocrystalline diamond thin films. The results provide insights into the mechanical properties and intrinsic stress sources of these films, and demonstrate the potential for producing high-quality nanocrystalline diamond films under certain conditions.
