Editorial Material
Geochemistry & Geophysics
Ze'ev Reches, Jay Fineberg
Summary: Earthquakes are caused by dynamic fractures due to overstresses, not governed by the frictional properties of faults. Frictional interfaces can sustain a wide range of stresses before sliding, generating stress-fields and rupture dynamics. The values of stresses and energy dissipation are determined by fault frictional properties.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2023)
Article
Chemistry, Physical
N. P. Kobelev, J. C. Qiao, A. S. Makarov, A. M. Glezer, V. A. Khonik
Summary: The study reports measurements of internal friction and shear modulus of glassy Cu49Hf42Al9 at different frequencies and temperatures. It is found that the relaxation of internal friction and shear modulus decreases with increasing frequency in the investigated range. A new method for determining the Gibbs activation energy of relaxation is derived, and the underlying activation energy spectrum is found to smoothly increase with accessible activation energies in the experiment.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Stefano Spigarelli, Michael Regev, Alberto Santoni, Marcello Cabibbo, Eleonora Santecchia
Summary: Friction Stir Welding (FSW) causes material microstructure variations and changes in mechanical properties. This study investigates the creep response of pure titanium after FSW, finding that FSW samples have lower creep rates and rupture strains.
Article
Materials Science, Multidisciplinary
Filippo Masi, Ioannis Stefanou
Summary: Data-driven and deep learning approaches have the potential to replace classical constitutive models for complex materials. However, current approaches suffer from issues such as the dependence on incremental formulations and poor generalization. This study proposes a new approach called eTANN, which decouples material representation from incremental formulation and utilizes continuous-time evolution equations. The proposed approach demonstrates excellent results in various applications and offers the possibility to describe both macroscopic and micromechanical behavior of complex materials.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2023)
Article
Geosciences, Multidisciplinary
Zongxing Zou, Tao Luo, Qinwen Tan, Junbiao Yan, Yinfeng Luo, Xinli Hu
Summary: In this study, a method that dynamically evaluates landslide stabilities and thrust forces by considering the variation in the shear strength of the slip zone with landslide movement is proposed. The method was applied to the Huangtupo landslide in the Three Gorges Reservoir area of China. The results demonstrate that the proposed method has advantages in considering uneven deformation of the landslide and the gradual weakening process of the shear strength of the slip zone. The spatial distribution of the weakening coefficient that reflects the weakening degree of the shear strength of the slip zone proved to be quantitatively described well by the S-shaped curve equation.
Article
Acoustics
Kamil Urbanowicz, Anton Bergant, Michal Stosiak, Mykola Karpenko, Marijonas Bogdevicius
Summary: This paper presents and discusses new developments in analytical modelling of wall shear stresses during water hammer events. The models based on the quasi-steady and unsteady hypothesis of hydraulic resistances have been further developed. Improvements have been made to extend their applicability and simplify their mathematical form. Comparative studies have shown their advantages and disadvantages. Explicit analytical formulas of wall shear stress have been derived for the first time.
JOURNAL OF SOUND AND VIBRATION
(2023)
Article
Materials Science, Characterization & Testing
F. Liu, G. C. Wu, D. C. Xu, S. M. Ma
Summary: In this study, a specific pure shear experiment was conducted on cupronickel B10 using extension pure shear equipment to determine its pure shear properties. The results showed significant strain hardening and strain rate strengthening in B10. A modified pure shear Johnson-Cook model was established to accurately describe the pure shear properties of B10. Furthermore, an internal friction factor model based on the ratio τs/εs was developed, and the predicted internal friction factor curve for B10 during high-speed cutting was obtained.
STRENGTH OF MATERIALS
(2022)
Article
Polymer Science
E. Farotti, E. Mancini, A. Lattanzi, M. Utzeri, M. Sasso
Summary: The mechanical behavior of polymers is greatly influenced by temperature and strain rate conditions. This study proposes a constitutive law for characterizing polymers that exhibit shear banding during compression loading, and the validity of this method is confirmed through numerical calculations and experimental observations.
Article
Materials Science, Multidisciplinary
R. Rezakhani, V Rubino, J. F. Molinari, A. Rosakis
Summary: The study investigates dynamic shear ruptures in mode II propagating along a predefined frictional interface of two plates of an elastic material using three-dimensional finite element modeling. The numerical simulations reveal rapid development of out-of-plane stresses in the interior of the specimen and on the interface plane, with complex patterns and a transition from plane-stress to plane-strain conditions during dynamic rupture propagation.
MECHANICS OF MATERIALS
(2022)
Article
Engineering, Chemical
Jan Necas, Jiri Rozbroj, Jakub Hlosta, Jan Divis, Jiri Kapralek, David Zurovec, Jiri Zegzulka
Summary: Shear cell tests were used to investigate the behavior of non-cohesive materials, exploring the relationships between the internal friction angle, the position of the shear lid, and particle rearrangements. The study found that particle bed stiffness is influenced by the shear modulus and coefficient of static friction, while the internal friction angle determines the ability of particle displacement during shear.
Article
Polymer Science
Viktor A. Lomovskoy, Svetlana A. Shatokhina, Anatoly E. Chalykh, Vladimir V. Matveev
Summary: This study investigates the spectra of internal friction and temperature dependencies of frequency in polyethylene samples with different degrees of crystallinity. Four local dissipative processes of varying intensity are observed on the spectra, and the influence of supramolecular structures on these processes is evaluated.
Article
Materials Science, Multidisciplinary
Xue-Feng Tang, Bao-Yu Wang, Ning Zhang, Yuan-Ming Huo, Jing Zhou
Summary: Hot deformation behavior and microstructural evolution of IN718 were investigated in this study by performing hot compression tests and developing a set of viscoplastic constitutive equations. The experimental results indicate that these constitutive equations accurately describe the hot deformation behavior and microstructural evolution of IN718.
Review
Chemistry, Multidisciplinary
Hongxia Hao, Luis Ruiz Pestana, Jin Qian, Meili Liu, Qiang Xu, Teresa Head-Gordon
Summary: In this review, recent theoretical efforts in modeling interfaces and the understanding of transport and chemical transformations at air-liquid and solid-liquid interfaces are described.
WILEY INTERDISCIPLINARY REVIEWS-COMPUTATIONAL MOLECULAR SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Longhui Zhang, David Townsend, Antonio Pellegrino, Nik Petrinic
Summary: In this study, the pure shear responses of Ti6Al4V alloy and Ti3Al2.5V alloy were compared using Digital Image Correlation technique. It was found that Ti3Al2.5V alloy has lower shear flow stress and strain rate sensitivity with higher ductility compared to Ti6Al4V alloy. Both alloys fail by adiabatic shear banding at high strain rates, which is different from the failure mechanisms observed at medium strain rate and quasi-isothermal condition.
MECHANICS OF MATERIALS
(2022)
Article
Chemistry, Physical
Cheng Long, Jonathan Selinger
Summary: Applied electric fields can induce motion of skyrmions in chiral nematic liquid crystals. A coarse-grained approach is developed to describe the dynamics of skyrmions. The results show that skyrmions move in a direction perpendicular to the induced tilt of the background director.
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.