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
Engineering, Multidisciplinary
Richard M. Christensen
Summary: The transition from ductile to brittle behavior is determined to occur at specific values of certain material properties, with a strong relationship found with the elements of the Periodic Table, particularly iron. These findings extend beyond elemental materials and have significant implications for understanding the elastic and failure properties of materials. These developments build upon previous empirical observations from Pugh [7] and provide a broader insight into material behavior.
INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE
(2021)
Article
Polymer Science
Takahiro Matsuda, Runa Kawakami, Tasuku Nakajima, Yukiko Hane, Jian Ping Gong
Summary: The quantification of energy dissipation in the damage zone of a double-network hydrogel revealed that both the wide preyielding region and the intrinsic fracture energy make significant contributions to the fracture energy, in addition to the energy dissipation in a relatively narrow yield region. Furthermore, the fracture energy of a prestretched sample indicated that the intrinsic fracture energy is higher than the fracture energy of the second network, contrary to previous understanding that the fracture energy of DN gels is dominated by the energy of the yielding zone formation.
Article
Chemistry, Physical
Yinhui Wang, Zhiqiang Liang, Wenxiang Zhao, Xibin Wang, Hao Wang
Summary: This work investigates the anisotropic cutting mechanisms on the surface quality of sapphire in ultra-precision machining. The results show that the ductile-to-brittle transition (DBT) depth is influenced by the machining direction. The evaluation of DBT depths, subsurface damage, and cutting forces is essential for optimizing the precision machining of sapphire.
APPLIED SURFACE SCIENCE
(2023)
Article
Geosciences, Multidisciplinary
Claudia Sanchez, Mie Ichihara, Osamu Kuwano
Summary: To study brittle and ductile fracturing of magma, bubble expansion and fracturing were investigated in a Maxwell-type viscoelastic fluid and a Bingham-type yield-strength fluid. Both fluids were found to be elastic, but showed different viscous behavior. In the Maxwell fluid, bubbles expanded viscously at low flux, fractured in a brittle manner at high flux, and behaved transitionally at intermediate flux. No fracturing was observed in the Bingham fluid. This suggests that the G ' > G '' condition alone is not sufficient to infer brittle fracturing.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Polymer Science
Qi Yan, Tingyu Xu, Wenwen Zhang, Changzhu Lv, Hang Guo, Fucheng Tian, Wei Chen, Liangbin Li
Summary: This study investigates the effect of molecular alignment on the mechanical response of glassy polymers by comparing two different pre-stretching methods of poly(methyl methacrylate) (PMMA). It was found that the width-Constrained Melt pre-Stretched (CMS) samples exhibited higher ductility in both the stretching direction and transverse direction due to more chain stretching and aligned chain density. Conversely, the width-Free Melt pre-Stretched (FMS) samples tended to experience more crazing during further deformation, resulting in weaker ductility.
Review
Mechanics
Richard M. Christensen
Summary: The formalism of isotropic elasticity theory can benefit from a review and re-examination of its structure, leading to a realignment of the basic moduli type properties. Understanding ductile versus brittle failure behaviors becomes more accessible with this approach. The ductile/brittle transition in uni-axial tension can be specified in terms of the two elastic moduli 2 mu and k. The implications of these findings are discussed in the context of general failure theory.
APPLIED MECHANICS REVIEWS
(2023)
Article
Geochemistry & Geophysics
Melodie E. French, Wenlu Zhu, Xiaohui Xiao, Brian Evans, David J. Prior
Summary: This study reports the strength and deformation behavior of Solnhofen limestone during its transition from brittle to ductile. The results show that the combined effects of water and temperature have complex influences on the deformation and strength of the limestone. At elevated temperatures, water-saturated limestone exhibits weakening in both the brittle and ductile fields. Moreover, the concurrent effects of pore water and temperature significantly reduce the pressure of the brittle to ductile transition. These findings are important for understanding the behavior of limestone in geological processes.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Geochemistry & Geophysics
Marcel Mizera, Tim Little, Carolyn Boulton, Yaron Katzir, Nivedita Thiagarajan, David J. Prior, James Biemiller, Euan G. C. Smith
Summary: By combining stress inversion of fault-slip data and paleostress analysis with microstructural and clumped-isotope geothermometry, this study constrains a sequence of deformation stresses and temperatures, providing insights into the stress evolution in the footwall of the active Mai'iu low-angle normal fault.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Materials Science, Multidisciplinary
Xiang Geng, Wan-Jing Wang, Qiang Li, Chun-Yi Xie, Ji-Chao Wang, Hai-Shan Zhou, Guang-Nan Luo
Summary: This study investigated the controlling factors of ductile-brittle transition temperature (DBTT) in tungsten materials after rolling. The results showed that the controlling factors of DBTT were different in different rolling directions. Dislocation activity was found to be the main controlling factor for samples parallel to the rolling direction, while the change in DBTT was strongly correlated with the fracture mode for samples perpendicular to the rolling direction.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2022)
Article
Chemistry, Physical
Bolin Yang, Bo Song, Cun Zhang, Shaohua Chen
Summary: This study systematically investigates the tensile mechanical properties of a one-dimensional carbon nanomaterial and reveals a brittle-ductile transition at different temperatures. The results show that the microstructures play a crucial role in the plastic behavior of the material, and the introduction of interlayer bonds can improve its ductility.
Article
Metallurgy & Metallurgical Engineering
Xuelin Wang, Wenjuan Su, Zhenjia Xie, Xiucheng Li, Wenhao Zhou, Chengjia Shang, Qichen Wang, Jian Bai, Lianquan Wu
Summary: A comparative study between submerged arc welding (SAW) and laser hybrid welding (LHW) was conducted on a 690 MPa high strength steel. The impact toughness of LHW joint was found to be superior to that of SAW, with lower ductile-brittle transition temperature (DBTT). LHW technology resulted in shrinking of the heat-affected zone (HAZ), refinement of the microstructure, and promoted the formation of lath bainite with high density of high angle grain boundary in the coarse grained heat-affected zone (CGHAZ). On the other hand, SAW induced the formation of granular bainite in CGHAZ, leading to lower impact toughness and higher DBTT.
ACTA METALLURGICA SINICA-ENGLISH LETTERS
(2023)
Article
Geochemistry & Geophysics
Sepideh Pajang, Mohammad Mahdi Khatib, Mahmoudreza Heyhat, Nadaya Cubas, Eloise Bessiere, Jean Letouzey, Mohammad Mokhtari, Laetitia Le Pourhiet
Summary: This study investigates the relationship between deep structures and topographic slope using thermo-mechanical simulations. The results show that seamount subduction, changes in rock strength, and dehydration reactions significantly affect the topography and tectonic structures. The study proposes two onshore-offshore cross-sections of the Iranian Makran accretionary prism.
Article
Nanoscience & Nanotechnology
J. C. Cheng, H. L. Qin, C. Li, F. Zhao, R. C. Pan, Q. Y. Wang, Y. L. Bian, S. N. Luo
Summary: High-entropy alloys (HEAs) have potential as structural materials for aerospace and defense applications. This study investigates the dynamic mechanical properties and microscopic deformation/damage mechanisms of the quaternary CoCrFeNi HEA. Shock compression and spallation experiments were performed and the mechanical properties and damage processes were evaluated. The results show that the CoCrFeNi HEA has high spall strength and exhibits ductile damage.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Polymer Science
Jun Yang, Fushi Li, Chong Guan, Xiangming Xu, Lin Zhong, Yunbao Gao, Yuanyuan Han, Nan Yan, Guiyan Zhao, Wei Jiang
Summary: By studying the effect of the modulus ratio on the brittle-ductile transition of PP/POE blends, it was found that a clear transition occurred at a modulus ratio of 10. Additionally, the microstructure also had an impact on the BDT.
Article
Materials Science, Ceramics
Avital Wagner, Barak Ratzker, Sergey Kalabukhov, Maxim Sokol, Nachum Frage
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2019)
Article
Materials Science, Multidisciplinary
Barak Ratzker, Avital Wagner, Maxim Sokol, Sergey Kalabukhov, Nachum Frage
Article
Materials Science, Ceramics
Mathieu Dutto, Dominique Goeuriot, Sebastien Saunier, Sylvain Marinel, Nachum Frage, Shmuel Hayun
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2019)
Article
Materials Science, Ceramics
Mathieu Dutto, Dominique Goeuriot, Sebastien Saunier, Sergio Sao-Joao, Sylvain Marinel, Nachum Frage, Shmuel Hayun
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2020)
Article
Materials Science, Multidisciplinary
Barak Ratzker, Avital Wagner, Maxim Sokol, Louisa Meshi, Sergey Kalabukhov, Nachum Frage
Article
Chemistry, Multidisciplinary
Avital Wagner, Barak Ratzker, Sergey Kalabukhov, Ehud Galun, Moshe P. Dariel, Nachum Frage
ISRAEL JOURNAL OF CHEMISTRY
(2020)
Article
Materials Science, Multidisciplinary
G. Hillel, L. Meshi, S. Kalabukhov, N. Frage, E. B. Zaretsky
Article
Materials Science, Ceramics
Barak Ratzker, Avital Wagner, Sergey Kalabukhov, Nachum Frage
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2020)
Article
Nanoscience & Nanotechnology
Barak Ratzker, Avital Wagner, Sergey Kalabukhov, Nachum Frage
Summary: This study demonstrates a simple and effective method to improve the photoluminescence properties of Ce:YAG transparent ceramic phosphors through post-sintering heat treatments, resulting in a substantial increase in emission intensity and efficiency. This promising approach allows for microstructure tailoring to enhance photoluminescence and achieve more effective ceramic phosphors.
SCRIPTA MATERIALIA
(2021)
Article
Chemistry, Multidisciplinary
Barak Ratzker, Or Messer, Bar Favelukis, Sergey Kalabukhov, Nitzan Maman, Vladimir Ezersky, Maxim Sokol
Summary: This study presents a facile approach of mixing MXene with ceramic particles followed by pressure-assisted sintering to produce bulk MXene/ceramic nanocomposites. The presence of MXene altered the densification behavior and significantly enhanced the densification rate at low temperatures. The study provides a conceptual approach for utilizing the diversity and versatility of MXenes in creating tunable advanced nanocomposites.
Article
Physics, Applied
E. B. Zaretsky, N. Frage, S. Kalabukhov
Summary: The impact response of <111> oriented germanium single crystals and polycrystalline samples obtained by high-pressure spark plasma sintering of pure germanium powder was studied. Under compression, cubic diamond (cd) germanium transforms into its high-pressure (beta-Sn or liquid) modification. The results deviate from static experiments due to material melting, especially at temperatures above 900 K. Some velocity histories exhibit a four-wave structure, possibly caused by the short-term existence of an intermediate (nonequilibrium) germanium phase, which does not affect the principal germanium Hugoniot.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Materials Science, Ceramics
Jonathan Mottye, Barak Ratzker, Sergey Kalabukhov, Bar Favelukis, Shmuel Hayun, Nachum Frage
Summary: The effect of Mn-doping on the sintering behavior, optical properties, microstructure, and mechanical properties of alumina was investigated in this study. It was found that the addition of 0.5 at.% Mn significantly reduced densification rate and grain growth during high-pressure spark plasma sintering (HPSPS). The major effect was attributed to the formation of MnAl2O4 nano inclusions located at grain boundary triple points. The Mn-doped alumina exhibited high transparency and a light-brown tint, with absorption between approximately 410 and 580 nm and a cutoff at 300 nm. The addition of Mn decreased the Young's modulus, increased the fracture toughness, and did not affect the hardness of alumina. Therefore, Mn doping enables control of the densification process and microstructure development of transparent alumina, and it can be used to tailor the optical and mechanical properties for specific applications.
CERAMICS INTERNATIONAL
(2023)
Article
Nanoscience & Nanotechnology
Barak Ratzker, Avital Wagner, Sergey Kalabukhov, Natalya Froumin, Nachum Frage
Summary: High pressure during spark plasma sintering (SPS) can effectively prevent carbon contamination by limiting the amount of CO, favoring stability of CO2.
SCRIPTA MATERIALIA
(2023)
Article
Engineering, Mechanical
A. P. Simonov, I. V. Sergeichev
Summary: The direct impact method provides a higher sample deformation rate and reliable results for materials with low yield strength and hardening rate. This study proposes an alternative procedure for calculating the strain rate in order to improve accuracy of the direct impact method for a wide range of metals and alloys. The proposed method has been validated through finite element analysis and direct impact tests, and it qualitatively changes the shape of the stress-strain curve by adding an unloading area.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2024)
Article
Engineering, Mechanical
Qiang Wei, Zifeng Li
Summary: This study investigates the dynamic bifurcation of a column when it impacts a rigid plane vertically, which is different from the classical Eulerian static buckling. The findings show that either the dimensionless critical buckling time or the dimensionless critical buckling velocity can be used to determine whether buckling has occurred. Different dimensionless initial defects in the column result in different dimensionless displacement responses, and the nonlinear effect influences the analysis results.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2024)
Article
Engineering, Mechanical
M. C. Price, M. J. Cole, K. H. Harriss, L. S. Alesbrook, M. J. Burchell, P. J. Wozniakiewicz
Summary: This article introduces a new gas gun developed at the Centre for Astrophysics and Planetary Science, University of Kent, which can produce vertical impacts at speeds up to 2 km/s. The gun design, assembly, operation, and ancillary components are described in detail. The experimental results demonstrate that the gun performs as expected.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2024)
Article
Engineering, Mechanical
Fanny Gant, Gabriel Seisson, Patrice Longere, Skander El Mai, Jean-Luc Zinszner
Summary: The article investigates the high strain rate response of metals and alloys under radial expansion and compares different materials. The results show that different materials exhibit different responses in terms of deformation and fracture.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2024)
Article
Engineering, Mechanical
M. D. Fitzgerald, J. D. Pecover, N. Petrinic, D. E. Eakins
Summary: This study investigates the mechanism for the destruction of thick flyers accelerated using electric guns and proposes strategies for mitigating their break-up based on experimental results and mathematical models. The findings suggest that limiting the maximum pressure within the flyer and extending the current rise time can prevent flyer failure, increasing the efficiency and shock duration of the electric gun.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2024)
Article
Engineering, Mechanical
Guowen Gao, Enling Tang, Guolai Yang, Yafei Han, Mengzhou Chang, Kai Guo, Liping He
Summary: In this study, the dynamic constitutive model of Al/Ep/W material was investigated and verified through experiments and numerical simulations. The proposed model accurately described the mechanical behavior of the material under high strain rates, providing an important reference for evaluating the response characteristics of the new energetic material projectile to lightweight aluminum armor.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2024)
Article
Engineering, Mechanical
Minzu Liang, Meng Zhou, Xiangyu Li, Yuliang Lin, Fangyun Lu
Summary: UHMWPE fiber mesh reinforced polyurea composites improve structural strength and blast resistance performance, and can alter the failure mode. Loose filler is generated as polyurea melts and fragments penetrate. Joint loads are classified into three categories based on their connection and duration.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2024)
Article
Engineering, Mechanical
Ashutosh Jha, Guglielmo Cimolai, Iman Dayyani
Summary: The present article introduces the Zero Poisson's Ratio Fish Cells metamaterial and investigates the effects of Poisson's ratio on the crashworthiness of different lattice structures. Numerical results demonstrate that the Zero Poisson's Ratio model possesses greater stability and structural integrity with minimal edge deformations.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2024)
Article
Engineering, Mechanical
Hongbo Zhang, Dayong Hu, Xubin Ye, Xin Chen, Yuhuai He
Summary: This study investigated the impact of spherical foreign objects on simulated blade edges through experimental and theoretical analysis. The experimental results showed that increasing impact energy resulted in larger damage sizes, and three distinct types of deformations were observed in FOD. Accurate FOD prediction models were developed using linear and power formulas. The theoretical analysis using a spring-mass system based on Winkler's elastic-plastic foundation theory yielded results in good agreement with experimental measurements, providing a reference for fatigue life assessment of aeroengine blades.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2024)
Article
Engineering, Mechanical
L. M. Reitter, Y. A. Malik, A. B. Jahn, I. V. Roisman, J. Hussong
Summary: This study characterizes the dynamic strength of wet granular ice layers through impact tests. The results reveal strong connections between ice particles in ice layers generated by ice crystal accretion. Comparable strength values can be obtained by reinforcing ice particle connections in ice layers prepared in the laboratory.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2024)
Article
Engineering, Mechanical
Kyle Mao, Genevieve Toussaint, Alexandra Komrakova, James D. Hogan
Summary: In this study, the Generalized Incremental Stress State dependent damage MOdel (GISSMO) is used to simulate the high-velocity impact failure of Armox 500T steel. The GISSMO is calibrated and validated using experimental data from the literature, and is then applied to investigate the impact failure behaviors of bi-layered steel systems. The results provide new capabilities and insights for the design of armor structures and evaluation of impact failure behaviors in Armox 500T/RHA bi-layered systems.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2024)
Article
Engineering, Mechanical
Asim Onder
Summary: This paper investigates the performance of bumper plates with wavy surfaces under hypervelocity impact and finds that they are more effective in decreasing the impact energy compared to flat plates. The study also reveals the distinctive debris cloud generation that has never been reported before.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2024)
Article
Engineering, Mechanical
Zhi-Yong Yin, Xiao-wei Chen
Summary: This study numerically reveals three typical fracture modes of explosively-driven metal shells and investigates the influencing factors of different fracture modes through experimental data and dimensional analysis.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2024)
Article
Engineering, Mechanical
Jiri Pachman, David J. Chapman, Marek Foglar, Martin Kunzel, William G. Proud
Summary: Through the study of different types of concrete, it was found that despite their compositional complexity, range of compressive strengths, and reinforcement methods, the average Hugoniot data were remarkably similar between different concrete types.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2024)
Article
Engineering, Mechanical
Konstantin Kappe, Klaus Hoschke, Werner Riedel, Stefan Hiermaier
Summary: This paper presents a multi-objective optimization procedure for effectively designing gradient lattice structures under dynamic loading. The aim is to maximize energy absorption characteristics and achieve a lightweight design. Through considering design variables such as the relative density and density gradient, the peak crushing force reduction and maximized specific energy absorption are simultaneously optimized. A simplified beam-based finite element model is used to efficiently model and simulate the lattice structures. An artificial neural network is trained to predict energy absorbing characteristics and find optimal lattice structure configurations. The network is trained using a multi response adaptive sampling algorithm, allowing parallel simulation with automatically generated finite element models. A multi-objective genetic algorithm is then used to find optimal combinations of design parameters for lattice structures under different impact velocities and cell topologies.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2024)
