Article
Materials Science, Multidisciplinary
H. Joshi, Tuan V. Vu, Nguyen N. Hieu, R. Khenata, D. P. Rai
Summary: An ab-initio density functional theory (DFT) method was utilized to investigate the elastic and thermodynamic properties of Fe2CoAl under hydrostatic pressure. It was found that the compound exhibits a mixture of covalent and ionic bonds, and shows ductility at all pressures considered, with various mechanical and dynamical properties showing linear changes under different applied pressures.
MATERIALS CHEMISTRY AND PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
Nejc Novak, Olly Duncan, Tom Allen, Andrew Alderson, Matej Vesenjak, Zoran Ren
Summary: This study analyzed the shear moduli of conventional and auxetic open-cell polymer foams, finding that the measured shear moduli of auxetic foams were generally lower, and the calculated shear moduli were lower than the measured values.
MECHANICS OF MATERIALS
(2021)
Article
Energy & Fuels
C. C. Agoha, A. Opara, O. C. Okeke, C. N. Okereke, C. N. Onwubuariri, F. B. Akiang, L. J. Osaki, I. A. Omenikolo
Summary: The 3D geomechanical characterization of Fuja field reservoirs in the Niger Delta evaluated the mechanical properties of the reservoir rocks, showing that sandstone is less elastic and ductile compared to shale. The study generated geomechanical models that identified areas with minimal rock deformation, aiding in risk management during drilling and post-drilling activities. The results will be helpful in mitigating exploration and exploitation challenges for operators.
JOURNAL OF PETROLEUM EXPLORATION AND PRODUCTION TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Valentin A. Gorodtsov, Valentin G. Tkachenko, Dmitry S. Lisovenko
Summary: This study conducted theoretical and numerical analyses on the extreme values of Young's modulus for six and seven-constant tetragonal crystals based on experimental data, revealing their relationship with anisotropy coefficients and characteristics in different crystal structures.
MECHANICS OF MATERIALS
(2021)
Article
Chemistry, Physical
Huanxiong Xia, Junfeng Meng, Jianhua Liu, Xiaohui Ao, Shengxiang Lin, Ye Yang
Summary: This paper proposes a method to fast evaluate the equivalent mechanical properties of lattice structures by using a reduced-order model and analytical-fitting formulas. The relationship between material and structural parameters and the equivalent mechanical properties is investigated, and a series of fitting formulas are obtained for fast prediction.
Article
Engineering, Multidisciplinary
Lichun Bian, Hao Li, Yong Cheng
Summary: A new molecular model is proposed in this paper to calculate the mechanical properties of carbon nanotubes. The expressions for surface Young's modulus, Poisson's ratio, shear modulus, and bulk modulus show that the mechanical properties of carbon nanotubes decrease with the increase of radius size.
APPLIED MATHEMATICAL MODELLING
(2021)
Article
Agronomy
Jiali Fan, Yuyao Li, Bing Wang, Fengwei Gu, Feng Wu, Hongguang Yang, Zhaoyang Yu, Zhichao Hu
Summary: This study determined the Poisson's ratio and Young's modulus of potato main stems at different heights and proposed a new method to determine them. The study provides important data for the construction of models and simulation in potato harvesting, and introduces new ideas for measuring Poisson's ratio and Young's modulus of non-regular cylindrical viscoelastic materials.
Article
Chemistry, Physical
Yanchun Yin, Guangyan Liu, Tongbin Zhao, Qinwei Ma, Lu Wang, Yubao Zhang
Summary: The heterogeneity of micro parameters in rocks has a significant impact on their macro mechanical behavior. However, the current testing and inversion methods are not suitable for measuring micro parameters in rocks. This study proposes a parameter field inversion method based on the digital image correlation method and finite element method to measure the distribution of micro Young's modulus and micro Poisson's ratio in rocks. The accuracy of the inversion method is verified through numerical simulation and laboratory tests. The DF-PF inversion method provides a new effective way to test the Young's modulus field and Poisson's ratio field of rocks under complex stress states.
Article
Chemistry, Multidisciplinary
Wei Wang, Jianjie Wang, Hong Hai, Weikai Xu, Xiaoming Yu
Summary: This paper proposes an elliptical anti-tetrachiral honeycombs structure (E-antitet) with in-plane negative Poisson's ratio (NPR) and orthogonal anisotropy. The in-plane Poisson's ratio and Young's modulus are analyzed and verified through theoretical derivations, finite element method (FEM) numerical simulations, and experimental validation. The influences of different parameters on the in-plane Poisson's ratio and Young's modulus of E-antitet are also analyzed. The results show that the proposed E-antitet outperforms the anti-tetrachiral honeycombs structure (antitet) in achieving a smaller Poisson's ratio and larger Young's modulus, and it provides a more flexible means of regulation.
APPLIED SCIENCES-BASEL
(2022)
Article
Materials Science, Multidisciplinary
Lumin Shen, Xinxin Wang, Zhendong Li, Kai Wei, Zhonggang Wang
Summary: This paper proposes a new auxetic lattice structure based on self-similar configurations, and a theoretical model is developed to predict its elastic mechanical properties. The results show that the axial internal force affects the auxetic effect of the structure in the three principal directions.
MATERIALS & DESIGN
(2022)
Article
Engineering, Multidisciplinary
Kai Long, Xiaoyu Yang, Nouman Saeed, Zhuo Chen, Yi Min Xie
Summary: This study proposes a methodology to achieve the maximum modulus in elastic composites. By using a topology optimization algorithm and numerical homogenization technique, microstructures close to theoretical upper bounds are found. The research also reveals that the optimized mechanical properties of the composite materials are close to theoretical limits.
CMES-COMPUTER MODELING IN ENGINEERING & SCIENCES
(2021)
Article
Materials Science, Textiles
Mehrdad Arianpour, Majid Safar Johari, Hadi Dabiryan
Summary: This study investigates the impact of structural parameters on the Poisson's Ratio of tubular braids and finds that factors such as braid angle, floating length of yarns, yarn count, and structural layers affect the magnitude of the Poisson's Ratio. Triaxial braids exhibit lower initial Poisson's Ratio compared to biaxial braids.
JOURNAL OF THE TEXTILE INSTITUTE
(2022)
Article
Mathematics, Interdisciplinary Applications
Peyman Aela, Lu Zong, Zhen-Yu Yin, Morteza Esmaeili, Guoqing Jing
Summary: This research proposes an efficient method for calibrating the input parameters of the discrete element method (DEM) to simulate the behavior of ballast particles under static and dynamic loading conditions. The method involves creating clumps to describe the shape of particles and using different tests to calibrate parameters such as friction coefficients, Young's modulus, Poisson's ratio, and restitution coefficient.
COMPUTATIONAL PARTICLE MECHANICS
(2023)
Article
Engineering, Electrical & Electronic
Jianjun Wang, Weijie Li, Chengming Lan, Peijun Wei
Summary: A new method utilizing piezoelectric rings and electromechanical impedance technique for determining Young's modulus and Poisson's ratio of metals is proposed in this study. The feasibility of the method is demonstrated through experimental results, showing differences between static and dynamic material properties. Further efforts are needed to improve the EMI technique for potential high portability measurement applications.
SENSORS AND ACTUATORS A-PHYSICAL
(2021)
Article
Mechanics
Cheng Hou, Xiaochao Jin, Hong Li, Litao Zhao, Xueling Fan
Summary: This paper proposes a new method for determining the Young's modulus and Poisson's ratio of materials using specimens with pure mode I, pure mode II or mixed mode I/II cracks. The method utilizes a set of matrix equations obtained from the strains of nodes around the crack tip, which are solved using the least square method. The effectiveness and accuracy of the improved method are validated through numerical and experimental examples, and the effects of various factors on the results are discussed.
ENGINEERING FRACTURE MECHANICS
(2022)
Article
Metallurgy & Metallurgical Engineering
Yunwei Gui, Lingxiao Ouyang, Yujie Cui, Huakang Bian, Quanan Li, Akihiko Chiba
Summary: By utilizing dynamic recrystallization mechanisms during hot indirect extrusion, grain refinement in the magnesium-rare earth alloy was successfully achieved, especially through the formation of high angle grain boundaries to promote the generation of new grain nuclei, improving the efficiency of dynamic recrystallization.
JOURNAL OF MAGNESIUM AND ALLOYS
(2021)
Article
Materials Science, Multidisciplinary
Qinqin Wei, Guoqiang Luo, Rong Tu, Jian Zhang, Qiang Shen, Yujie Cui, Yunwei Gui, Akihiko Chiba
Summary: The dual-phase Re0.5MoNbW(TaC)(0.5) composite, synthesized by arc melting, exhibited remarkably high-temperature strength with a yield strength of approximately 901 MPa and a true ultimate compressive strength of around 1186 MPa at 1200 degrees C. The semi-coherent interface between the BCC phase and carbide, along with dipolar dislocation walls in the BCC phase and restricted dynamic interaction between defects in the carbide, provided effective strengthening effects.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2021)
Article
Engineering, Manufacturing
Kenta Yamanaka, Asumi Kuroda, Miyu Ito, Manami Mori, Huakang Bian, Takahisa Shobu, Shigeo Sato, Akihiko Chiba
Summary: The study quantitatively analyzed the dislocation structures formed in Ti-6Al-4V alloy during additive manufacturing processes, revealing significant differences in microstructures between LB-PBF and EB-PBF, affecting dislocation density and crystallite size. High-energy synchrotron radiation analysis showed that nanosized beta-phase precipitates exhibited a higher dislocation density than the surrounding alpha (alpha')-matrix.
ADDITIVE MANUFACTURING
(2021)
Article
Engineering, Manufacturing
Qian Chen, Yunhao Zhao, Seth Strayer, Yufan Zhao, Kenta Aoyagi, Yuichiro Koizumi, Akihiko Chiba, Wei Xiong, Albert C. To
Summary: The study investigates the relationship between melt pool morphology and preheating temperature through optical measurements of melt track cross sections. It is found that the depth of the melt pool increases monotonically with preheating temperature in the three regimes, while the width variation depends on the melt pool regimes. Simulation results show that preheating temperature enhances evaporation mass, recoil pressure, and laser drilling effect in the keyhole regime, leading to a deeper melt pool.
ADDITIVE MANUFACTURING
(2021)
Article
Materials Science, Multidisciplinary
Yujie Cui, Kenta Aoyagi, Yuichiro Koizumi, Cheng Yang, Huakang Bian, Yuichiro Hayasaka, Tadashi Fujieda, Akihiko Chiba
Summary: The addition of Nb significantly improves the oxidation resistance of Ti-based alloys without significantly affecting their tensile properties. This enhancement is mainly attributed to the substitution of Ti4+ by Nb5+ in TiO2 and the promotion of a Sn-rich layer formation.
Article
Chemistry, Physical
Yunwei Gui, Yujie Cui, Huakang Bian, Quanan Li, Lingxiao Ouyang, Akihiko Chiba
Summary: By adding Sm, the microstructure of Mg-5Y-2Nd-xSm-0.5Zr alloys was refined, leading to a significant decrease in grain size as Sm content increased. The alloy exhibited improved compressive strength and maximum strain with the addition of Sm.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Engineering, Chemical
Yufan Zhao, Yuichiro Koizumi, Kenta Aoyagi, Kenta Yamanaka, Akihiko Chiba
Summary: The properties of powder bed play a crucial role in the quality of parts produced by powder bed fusion, affecting the emissivity and thermal conductivity, and subsequently the formation of the molten pool. Differences in thermal properties were observed with powder of different particle size distributions, requiring higher energy input for exceptional forming quality with an increased fraction of fine powders.
Article
Metallurgy & Metallurgical Engineering
Biaobiao Yang, Chenying Shi, Siyu Zhang, Jingjing Hu, Jianwei Teng, Yujie Cui, Yunping Li, Akihiko Chiba
Summary: This study investigated the twinning-detwinning behavior in a strongly basal-textured Mg-Li alloy using quasi-in-situ EBSD. The loading path was found to affect the twinning behavior and detwinning variants selection. Non-Schmid twinning behavior was observed in the first step compression, while Schmid's law well predicted the detwinning variants selection. The study also found that the Schmid factors for twinning decreased with compression, whereas those for detwinning increased due to prior twinning behavior.
JOURNAL OF MAGNESIUM AND ALLOYS
(2022)
Article
Materials Science, Multidisciplinary
Yuchao Lei, Kenta Aoyagi, Kinya Aota, Kosuke Kuwabara, Akihiko Chiba
Summary: In this study, process maps for non-weldable superalloy Alloy713ELC were constructed using a machine learning approach to fabricate cracked and crack-free samples under optimized conditions. Comparison between cracked and crack-free samples showed that samples with fine columnar grains were more likely to crack, while those with coarse columnar grains were less likely to crack. The study also revealed that total plastic strain level plays a critical role in cracking, with a larger scan speed leading to elevated total plastic strain level. The non-weldability of Alloy713ELC was attributed to its thermal expansion effect, related to the high Al content, combined with liquation and strain-age cracking effects.
Article
Materials Science, Multidisciplinary
Yujie Cui, Kenta Aoyagi, Huakang Bian, Yuichiro Hayasaka, Akihiko Chiba
Summary: Increasing Al concentration in Mg-Al-Zn alloys can restrict the growth of twins and reverse motion of twin boundaries, leading to the formation of smaller-sized twins and higher fractions of secondary twins and 2-5 degrees boundaries during reverse tension. The increased amount of Al solute atoms plays a crucial role in enhancing the strengthening effect on the motion of twin boundaries.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Yunwei Gui, Yujie Cui, Huakang Bian, Quanan Li, Lingxiao Ouyang, Akihiko Chiba
Summary: This study systematically investigated the microstructural evolution and deformation mechanism of an aged Mg-5Y-2Nd-3Sm-0.5Zr alloy during uniaxial compression at room temperature. The results showed a transition from slip and twinning to pyramidal II dislocations dominating the deformation mechanism.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2021)
Article
Chemistry, Physical
Akihiko Chiba, Yohei Daino, Kenta Aoyagi, Kenta Yamanaka
Summary: Preheating and ball milling can effectively suppress smoking in the powder bed fusion-electron beam melting process, even without preheating, smoking can be prevented after ball milling. This is because the oxide film undergoes a transition during ball milling.
Article
Nanoscience & Nanotechnology
Jiaxiang Li, Kenta Yamanaka, Akihiko Chiba
Summary: The study compared the deformation behaviors of different Mo content HEAs and found that lattice distortion is a key factor affecting the deformation behavior of HEAs, with high-Mo HEAs exhibiting a higher strain-hardening rate.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
Jiaxiang Li, Kenta Yamanaka, Yuichiro Hayasaka, Akihiko Chiba
Summary: A Co0.95Cr0.8Fe0.25Ni1.8Mo0.475 high-entropy alloy underwent heavy cold rolling and subsequent aging at 773 K, resulting in Suzuki hardening. Enrichment of Co atoms at stacking faults (SFs) was observed, which pinned down partial dislocations and enhanced the deformation resistance. Additionally, enrichment of Co and Mo atoms at SFs was observed in a low dislocated, strain-aged specimen, leading to differences in segregation. The calculated local stacking fault energy (SFE) with the segregation of Co and Mo atoms was -30.6 mJ/m2 at the aging temperature, indirectly leading to the formation of wide SFs.
SCRIPTA MATERIALIA
(2023)
Article
Engineering, Manufacturing
Seungkyun Yim, Huakang Bian, Kenta Aoyagi, Kenta Yamanaka, Akihiko Chiba
Summary: We investigated the influence of particle morphology on flowability and spreading behavior using a discrete element method (DEM) simulation. The addition of non-spherical particles decreased flowability and resulted in a transition from rolling flow to cascading flow under rotation. Adding elongated particles decreased the quality of the powder bed due to force-arch formation and strong particle interlocking. Spherical particles with low spreading velocity are desirable for improving the quality of the powder bed in the PBF-AM process.
ADDITIVE MANUFACTURING
(2023)
