Article
Agricultural Engineering
Zhaoyang Yu, Zhichao Hu, Baoliang Peng, Fengwei Gu, Ling Yang, Mingjin Yang
Summary: The study investigated the restitution coefficient (RC) of garlic bulb, an important mechanical property for understanding bulb collision dynamics and damage mechanisms. Factors such as collision material, release height, material thickness, bulb mass, and moisture content were found to significantly influence the RC. The study also observed the movement characteristics and contact damage of bulbs during collision, highlighting the correlation between rotational angular velocity and measured RC. The findings can aid in analyzing damage mechanisms and designing garlic production equipment.
INTERNATIONAL JOURNAL OF AGRICULTURAL AND BIOLOGICAL ENGINEERING
(2021)
Article
Geography, Physical
Bastian Bergfeld, Alec van Herwijnen, Benjamin Reuter, Gregoire Bobillier, Jurg Dual, Jurg Schweizer
Summary: The study focuses on dynamic crack propagation in snow to understand avalanche release, using high-speed cameras and digital image correlation to analyze crack speed, evolution, and touchdown distance in PST experiments. The methodology also involves calculating specific fracture energy and estimating elastic modulus of snow layers, revealing intricate dynamics not accessible through traditional methods.
Article
Optics
Jongchan Park, Liang Gao
Summary: Modern cameras are limited in capturing optical information by electronic data transfer bandwidth, resulting in reduced resolution. To address this issue, a continuously streaming compressed high-speed photography technique was developed. By performing compressed imaging in a time-delay-integration manner, it was possible to record high-resolution videos at a high speed.
Article
Chemistry, Physical
C. J. Chen, R. Xu, B. J. Yin, Y. Z. He, J. Y. Zhang, P. Zhang, B. L. Shen
Summary: The dynamic mechanical relaxation processes of metallic glasses were investigated in this study. The results showed that alpha relaxation was observed in the HE-MGs and Vit1 MG. The activation energies of the HE-MGs were higher than that of the Vit1 MG. The dynamic mechanical properties were discussed in light of the KWW and QPD models, indicating different dynamic heterogeneities and defect concentrations in the four MGs.
Article
Engineering, Mechanical
Jin Hao, Changyou Li, Wenjun Song, Zhenghong Yao, Huihui Miao, Mengtao Xu, Xiaoxuan Gong, Hang Lu, Zhendong Liu
Summary: This study analyzes the thermal-mechanical interaction mechanism in high-speed motorized spindle systems and proposes an iterative modeling method to improve accuracy. The study establishes nonlinear dynamic and thermal models to evaluate transient behavior and considers the effects of nonlinearity and heat generation in bearing heating. Experimental verification and numerical simulations confirm the effectiveness and accuracy of the proposed theoretical method.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Chemistry, Physical
M. N. Liu, Q. Hao, J. Dong, B. A. Sun, S. D. Feng, D. Crespo, J. C. Qiao
Summary: It was found that the beta relaxation becomes more pronounced with the increase of copper in binary metallic glasses. However, the beta relaxation of CuZr or CuTi binary metallic glasses is much more modest compared to other metallic glasses.
Article
Materials Science, Characterization & Testing
Tonja Dieffenbach, Kai Treutler, Volker Wesling
Summary: Especially in automotive industry and liquid-gas storage, austenitic steels with high energy absorption capacity are utilized. The commonly used lightweight metals fail to meet all the requirements, thus a cost-effective alternative with outstanding properties is preferred for crash-related components. In this regard, high-manganese TWIP steels are of significant interest due to their strength and ductility. Furthermore, high-strength steels are gaining attention in various research areas, such as studying the properties of welded high-manganese steels at low temperature applications encountered during liquefied gas storage and transportation. High-speed tensile tests are employed to experimentally examine material behavior under different low temperatures and high strain rates, providing insights into the strain rate and temperature dependence of mechanical characteristics.
Article
Chemistry, Physical
Sheng Li, Ang Qiao, Chengwei Gao, Yanfei Zhang, Yunlong Yue, Yuanzheng Yue
Summary: This study investigates the mechanical and dynamic properties of VTP glass system by substituting P2O5 for TeO2, revealing that the glass transition temperature, hardness, and elastic moduli increase while the liquid fragility index decreases with the substitution. These changes are attributed to increased network connectivity and the stronger P-O bond introduced by the substitution, providing useful insights for designing mechanically stable glass electrodes for LIBs.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Engineering, Electrical & Electronic
Siao-Cheng Yan, Chen-Han Wu, Chong-Jhe Sun, Xin-Chan Zhong, Chih-Siang Chang, Hao-Kai Peng, Yung-Hsien Wu, Yung-Chun Wu
Summary: In this study, scaled ferroelectric fin field-effect transistors (Fe-FinFETs) based on HfZrO2 were fabricated and characterized for multi-level cell (MLC) operations. The Fe-FinFET exhibited a large memory window of 2.8 V, a high switching speed of 100 ns, and clearly separated intermediate states, making it suitable for MLC operations. It also demonstrated robust endurance and data retention, indicating its potential for high-density nonvolatile memory applications.
IEEE ELECTRON DEVICE LETTERS
(2023)
Article
Engineering, Mechanical
K. Tao, J. C. Qiao, L. Zhang, J. M. Pelletier
Summary: The introduction of Dy element in metallic glasses increases atomic mobility and structural heterogeneity, impacting the dynamic relaxation behavior and mechanical properties. Time-temperature superposition principle, Kohlrausch-Williams-Watts (KWW) function, and quasi-point defects (QPD) theory were used to describe the behavior of metallic glasses. These investigations demonstrate the importance of structure heterogeneity in tailoring the properties of metallic glasses.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2021)
Article
Engineering, Marine
Yao Li, Tiezhi Sun, Zhi Zong, Haitao Li, Yanguang Zhao
Summary: A composite buffer was designed to reduce the impact load of high-speed water entry projectiles, utilizing rigid Polyurethane (PU) foams of different densities for the damper. Validation of the constitutive model for PU foam was done through compression tests, identifying six different failure modes in the dynamic crushing process of the nose cap. The study quantitatively presented the effects of PU foam density and nose cap length on these failure modes.
Article
Materials Science, Ceramics
Lingwei Yang, Xueren Xiao, Liping Liu, Jie Luo, Kai Jiang, Xinxing Han, Changhao Zhao, Jun Zhang, Guolin Wang
Summary: This study investigated the dynamic oxidation mechanisms of C-f/SiC in high-enthalpy and high-speed plasmas using an inductively coupled plasma wind tunnel. The transition of active/passive oxidations of SiC was identified, and the mechanical properties of C-f/SiC remained stable after long-term dynamic oxidations, indicating its excellent thermal stability for use in thermal protection systems of reusable hypersonic vehicles.
JOURNAL OF ADVANCED CERAMICS
(2022)
Article
Materials Science, Multidisciplinary
Alexander S. Chaus, Maria Domankova
Summary: This paper discusses the long history and heat treatments of high-speed steels, aiming to clarify misunderstandings found in the literature. It focuses on basic processing technologies used in the production of HSSs and the corresponding microstructural states.
Review
Materials Science, Multidisciplinary
Hengwei Luan, Keran Li, Lingxiang Shi, Wei Zhao, Hengtong Bu, Pan Gong, Ke-Fu Yao
Summary: High-entropy metallic glass (HEMG) is a new metallic material with unique glass formation behaviors and properties due to its high-entropy alloy-like composition and amorphous structure. This review provides an overview of the concept and development of HEMGs, discusses their glass-forming ability and thermal stability, and presents their mechanical, magnetic, catalytic, and other properties. It serves as a quick guideline for understanding the HEMG field.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Materials Science, Ceramics
Xiao-Tong Jia, Zhao-Hui Zhang, Xian-Yu Li, Tian-Hao Xu, Luo-Jin Liu, Qiang Wang, Zhao-Hu Jia, Xing-Wang Cheng
Summary: In this study, AlON ceramics were prepared using spark plasma sintering (SPS) technique. The effects of SPS parameters on the microstructures and mechanical properties were systematically investigated. It was found that when sintered at 1580°C with a pressure of 50 MPa and a holding time of 5 minutes, the AlON ceramics exhibited excellent mechanical and optical performances.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Ceramics
Arezoo Zare, Mo-Rigen He, Michael Straker, M. V. S. Chandrashekhare, Michael Spencer, Kevin J. Hemker, James W. McCauley, K. T. Ramesh
Summary: The study investigated the out-of-plane anisotropy in the mechanical response of boron carbide single crystals, finding significant differences in indentation modulus and hardness among different crystal orientations. It also examined the influence of in-plane anisotropy on indentations, and observed deformation behavior through pop-in events. The research provided insights into the failure mechanism of boron carbide, highlighting the potential role of crystal slip in quasi-plasticity and formation of amorphous bands leading to cracking and fragmentation.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Correction
Materials Science, Ceramics
Arezoo Zare, Mo-Rigen He, Michael Straker, M. V. S. Chandrashekhare, Michael Spencer, Kevin J. Hemker, James W. McCauley, K. T. Ramesh
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Article
Engineering, Manufacturing
Jason C. Parker, Yik Tung Tracy Ling, K. T. Ramesh
Summary: The effects of composite microstructure on the dynamic response of UHMWPE fiber-reinforced composites when loaded in out-of-plane compression were studied. It was found that at high strain rates, the microstructure with lower porosity displayed a higher strength.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2022)
Article
Materials Science, Composites
D. Kempesis, L. Iannucci, K. T. Ramesh, S. Del Rosso, P. T. Curtis, D. Pope, P. W. Duke
Summary: This research develops RVE-based finite element models to investigate the influence of microstructure on the overall mechanical behavior of UHMWPE composites. The models consider the randomness of fiber packing sequence and variations in fiber cross-sectional shape, and analyze the effects of interface properties uncertainties on the mechanical response. By calibrating the constituent properties and validating the models with experimental results, the shear and compression responses of UHMWPE laminates are studied.
COMPOSITES SCIENCE AND TECHNOLOGY
(2022)
Article
Engineering, Multidisciplinary
Kshitiz Upadhyay, Dimitris G. Giovanis, Ahmed Alshareef, Andrew K. Knutsen, Curtis L. Johnson, Aaron Carass, Philip Bayly, Michael D. Shields, K. T. Ramesh
Summary: Computational models of the human head play a crucial role in predicting traumatic brain injury, but they are associated with uncertainty and variability. This study proposes a data-driven framework for uncertainty quantification of computational head models, which reduces computational cost while providing accurate approximations. The framework employs manifold learning techniques and surrogate models to quantify uncertainty and variability in the simulated strain fields. The results highlight significant spatial variation in model uncertainty and reveal differences in uncertainty among strain-based brain injury predictor variables.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2022)
Article
Materials Science, Multidisciplinary
Xiangyu Sun, Dung-Yi Wu, Minju Kang, K. T. Ramesh, Laszlo J. Kecskes
Summary: This study examined the competition between precipitation and grain-size refinement during equal channel angular extrusion (ECAE), and validated the utility of ECAE in high-strength Mg alloy engineering.
MATERIALS CHARACTERIZATION
(2023)
Article
Nanoscience & Nanotechnology
Dung-Yi Wu, Chengyun Miao, Christopher S. DiMarco, K. T. Ramesh, Todd C. Hufnagel
Summary: Designing aluminum alloys for spall resistance involves understanding the active failure mechanisms under dynamic loading. This study uses a high-throughput laser-driven micro-flyer plate impact technique to investigate the spall failure of aluminum alloy Al7085-T711 and its microstructure. The results show that the spall strength of Al7085-T711 increases with increasing strain rate and peak shock stress. Incipient spall voids primarily initiate at Al7Cu2Fe second-phase particles. Eliminating these particles significantly improves the spall strength, suggesting the potential for improved spall resistance in commercial alloys.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
Sh. Akhondzadeh, Minju Kang, Ryan B. Sills, K. T. Ramesh, Wei Cai
Summary: A long-standing challenge in computational materials science is to establish a quantitative connection between macroscopic properties of plastic deformation and microscopic mechanisms of dislocations in crystalline materials. This study provides direct comparisons between stress-strain curves obtained from miniaturized bar experiments and those from discrete dislocation dynamics (DDD) simulations. The DDD simulations show good agreement with experimental results, but the required dislocation mobility values are significantly lower than expected. Cross-slip of screw dislocations is also found to be necessary to capture the experimental stress-strain behavior.
Article
Engineering, Mechanical
Yunho Kim, Minju Kang, Gary Simpson, Matthew Shaeffer, Justin Moreno, Daniel Magagnosc, L. J. Kecskes, J. T. Lloyd, K. T. Ramesh
Summary: This study investigates the behavior of magnesium alloys under high-speed impact through experiments and simulations. The experiments reveal the formation of a non-isotropic debris cloud after impact and rupture, which is influenced by the projectile material and impact velocity. The simulations show good agreement with the experimental results, indicating that the anisotropic strength response of magnesium plays a significant role in the formation of the debris cloud.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2023)
Article
Multidisciplinary Sciences
Gary Simpson, Justin Moreno, Matthew Shaeffer, K. T. Ramesh
Summary: Hypervelocity impacts pose a significant threat in low-earth orbit and hypersonic flight applications. This study investigates the structure and characteristics of the impact flash generated by 3 km/s spherical projectile impacts on structural metals through experiments, demonstrating the coupling between early-stage mechanisms and later-stage ejection mechanisms.
Article
Multidisciplinary Sciences
Kshitiz Upadhyay, Ahmed Alshareef, Andrew K. Knutsen, Curtis L. Johnson, Aaron Carass, Philip V. Bayly, Dzung L. Pham, Jerry L. Prince, K. T. Ramesh
Summary: Computational head models are promising tools for understanding and predicting traumatic brain injuries. However, current head models suffer from uncertainty and poor accuracy in capturing the nonlinear brain tissue response. To address these issues, a framework for developing subject-specific head models using magnetic resonance imaging and elastography is proposed. The models employ a nonlinear visco-hyperelastic constitutive model to capture the brain tissue response.
JOURNAL OF THE ROYAL SOCIETY INTERFACE
(2022)
Meeting Abstract
Critical Care Medicine
Ahmed Alshareef, Phillip V. Bayly, Andrew K. Knutsen, Kshitiz Upadhyay, Ruth J. Okamoto, Aaron Carass, John A. Butman, Dzung L. Pham, Jerry L. Prince, K. T. Ramesh, Curtis L. Johnson
JOURNAL OF NEUROTRAUMA
(2022)
Meeting Abstract
Critical Care Medicine
Ahmed Alshareef, Andrew K. Knutsen, Aaron Carass, Kshitiz Upadhyay, Ruth J. Okamoto, Curtis L. Johnson, Phillip V. Bayly, Dzung L. Pham, K. T. Ramesh, Jerry L. Prince
JOURNAL OF NEUROTRAUMA
(2022)
Proceedings Paper
Computer Science, Interdisciplinary Applications
Ahmed Alshareef, Aaron Carass, Andrew K. Knutsen, Kshitiz Upadhyay, Matthew E. Peters, K. T. Ramesh, Jerry L. Prince
Summary: Cerebral atrophy refers to the shrinking of the brain and the consequent enlargement of fluid-filled spaces within the cranium. It is commonly observed in normal aging and brain injuries. Computational simulations of brain biomechanics have shown that enlarged ventricles have minimal effect on brain deformation, while a thicker subarachnoid space (SAS) leads to decreased brain strain. Investigating these effects helps to understand subject-specific brain injury risk.
MEDICAL IMAGING 2022: BIOMEDICAL APPLICATIONS IN MOLECULAR, STRUCTURAL, AND FUNCTIONAL IMAGING
(2022)
Proceedings Paper
Computer Science, Interdisciplinary Applications
Ahmed Alshareef, Curtis L. Johnson, Aaron Carass, Andrew K. Knutsen, Peyton L. Delgorio, Grace McIlvain, Alexa M. Diano, K. T. Ramesh, Phillip Bayly, Dzung L. Pham, Jerry L. Prince
Summary: Modeling the brain tissue mechanics is crucial in understanding traumatic brain injury. This study collected a dataset of 23 subjects and performed analyses to investigate the potential influence of cerebral vessels on brain mechanical properties. The results showed regional differences in brain stiffness and damping ratio, but no dependence on vessel density. However, different correlations were observed in different brain regions. The findings contribute to a better understanding of brain biomechanics and the development of computational models for brain injury.
MEDICAL IMAGING 2022: BIOMEDICAL APPLICATIONS IN MOLECULAR, STRUCTURAL, AND FUNCTIONAL IMAGING
(2022)