Article
Materials Science, Multidisciplinary
Zejian Xu, Yang Han, Changzeng Fan, Xiaodong He, P. J. Tan, Fenglei Huang
Summary: The study investigates the dynamic mode II fracture characteristics of Ti-6Al-4V using a novel 2-bar/double-shear impact loading technique. Results show varying fracture mechanisms at different loading rates, influencing the dominant failure mechanism of the material.
MECHANICS OF MATERIALS
(2021)
Article
Nanoscience & Nanotechnology
Jiawei Lu, Ryan Khawarizmi, Miguel Monclus, Jon Molina-Aldareguia, Patrick Kwon, Thomas R. Bieler
Summary: The hardness and orientations of the primary αp and transformed βt grains in segmented chips obtained by turning Ti-6Al-4V bar were analyzed. The hardness of αp grains highly depends on the crystal orientation, varying from 4.5 GPa to 6.7 GPa. In the machined chips, αp grains showed similar hardness values while βt grains became slightly harder. The width of shear bands in the chips varied and smaller shear strain was correlated with larger shear cracks.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Engineering, Mechanical
Camilla Ronchei, Sabrina Vantadori
Summary: A new analytical approach combining the multiaxial high-cycle fatigue criterion and the Critical Distance Theory has been proposed for assessing the fatigue lifetime of notched components. The accuracy of this approach was evaluated using experimental data on severely notched specimens made of Ti-6Al-4V material, which is of significant interest to industries like biomedicine.
ENGINEERING FAILURE ANALYSIS
(2021)
Article
Engineering, Multidisciplinary
Alexander Janda, Benjamin James Ralph, Yael Demarty, Marcel Sorger, Stefan Ebenbauer, Aude Prestl, Ingo Siller, Martin Stockinger, Helmut Clemens
Summary: Superior ballistic performance and lightweight character make Ti alloys suitable for armor applications. Quasi-static and dynamic compression tests as well as ballistic tests were conducted on a Ti-6Al-4V alloy to study its material behavior. The results were used for finite element simulation and compared to experimental data.
DEFENCE TECHNOLOGY
(2023)
Article
Automation & Control Systems
Guang Chen, Jiaying Ge, Lianpeng Lu, Jian Liu, Chengzu Ren
Summary: High-speed cutting and ultra-high-speed cutting tests were conducted on Ti-6Al-4V alloy to investigate the cutting characteristics, including chip morphology, adiabatic shear band, and material separation at the chip-workpiece interface. The experiments showed that the micro-hardness within ASB was 25% higher than outside, and ultra-fine grains and micro-texture were observed by EBSD test. Additionally, the mechanism of grain refinement in ASB and the range of shear strain rate in ASB were explored.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2021)
Article
Engineering, Chemical
Lei Pan, Menglin Wang, Jingling Hu, Pengbo Xue, Huaxin Guo, Lang Zhong, Xiaosa Yuan, Hanqiao Shi
Summary: The adhesive performance between Ti-6Al-4V alloy plates and PEEK can be improved by using sulfonated poly-ether-ether-ketone (SPEEK) as a modifier and pre-treatments such as anodizing and sandblasting. The successful loading of SPEEK on TC4 plates leads to a significant enhancement in interlaminar shear strength, and bonding mechanisms such as mechanical interlocking, molecular entanglement, hydrogen bonding, and enhanced van der Waals forces can be observed.
INTERNATIONAL JOURNAL OF ADHESION AND ADHESIVES
(2022)
Article
Nanoscience & Nanotechnology
Yang Yang, Jianlin He, Junyi Huang
Summary: The adiabatic shear behavior of Ti-6Al-4V alloy manufactured by selective electron beam melting (SEBM) was studied. The effects of microstructure, phase composition, and crystal orientation on adiabatic shear behavior were investigated. The results showed that heat treatment significantly reduced the anisotropy of the alloy and increased its susceptibility to adiabatic shearing. The as-printed longitudinal samples were more prone to adiabatic shearing than the radial samples, and the heat-treated samples exhibited increased adiabatic shear susceptibility due to changes in the microstructure and alpha phase thickness.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Yangwei Wang, Changle Zhang, Nan Jin, Guoju Li, Huanwu Cheng, Bingyue Jiang
Summary: This paper studied the deformation and fracture failure features of high-strength and high-toughness titanium alloy sheets under blast loading through finite element simulation and experiments. The results of the simulation and experiments were consistent, and the destruction morphology of the target showed severe asymmetry. The study suggests that dynamic tensile strength should be considered as one of the important selection criteria for explosion-resistant titanium alloy sheets.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Materials Science, Multidisciplinary
Zou Youchun, Xiong Chao, Yin Junhui, Deng Huiyong, Cui Kaibo, Zhang Sa, An Zhiguo, Bai Lijuan
Summary: The anti-penetration performance of the SiC/TC4/UHMWPE composite structure is better than that of the SiC/UHMWPE/TC4 composite structure.
RARE METAL MATERIALS AND ENGINEERING
(2022)
Article
Materials Science, Multidisciplinary
Dae Woong Kim, Selim Kim, Junha Yang, Sunghak Lee, Seok Su Sohn
Summary: Investigations on the dynamic deformation and ballistic performance of ultra-high-strength lightweight steels for steel armor applications have been conducted. The study found that boron doping can improve the ballistic performance of the steel by enhancing grain boundary cohesion.
MATERIALS CHARACTERIZATION
(2022)
Article
Nanoscience & Nanotechnology
Wendi Shi, Siyu Lu, Jianghua Shen, Biao Chen, Junko Umeda, Qiuming Wei, Katsuyoshi Kondoh, Yulong Li
Summary: The study found that increasing oxygen content in commercial purity titanium can lead to adiabatic shear failure, while the texture or grain orientation of the material has a profound influence on the formation of ASB. Microstructural examinations of high oxygen CP-Ti showed the formation of uniform and equi-axed nano-grains within the ASB.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Engineering, Multidisciplinary
Jiahuan Wang, Binghai Lyu, Liang Jiang, Qi Shao, Changbang Deng, Yafeng Zhou, Jinhu Wang, Julong Yuan
Summary: The study found that lowering the pH value during the polishing process of Ti-6Al-4V can increase the material removal rate and achieve better surface quality, while also inducing corrosion on the material. By measuring the corrosion current density, potential, and reaction resistance with electrochemical impedance spectroscopy, the polishing mechanism under different pH conditions was revealed.
PRECISION ENGINEERING-JOURNAL OF THE INTERNATIONAL SOCIETIES FOR PRECISION ENGINEERING AND NANOTECHNOLOGY
(2021)
Article
Materials Science, Coatings & Films
Jiahuan Wang, Yu Zhou, Zhen Qiao, Saurav Goel, Jinhu Wang, Xu Wang, Hongyu Chen, Julong Yuan, Binghai Lyu
Summary: This study compared three newly developed polishing techniques, namely shear thickening polishing (STP), chemistry enhanced STP (C-STP), and electrolysis enhanced STP (E-STP). The results showed that C-STP produced a Beilby layer after polishing, resulting in improved mechanical and biological performance. C-STP had the lowest surface roughness and highest material removal rate (MRR) among the three techniques. E-STP showed intermittent improvements in surface roughness and MRR, and had the best wettability and corrosion resistance.
SURFACE & COATINGS TECHNOLOGY
(2023)
Article
Engineering, Manufacturing
Yang Liu, Jinhui Meng, Lei Zhu, Hongyu Chen, Zhiguo Li, Shuxin Li, Di Wang, Yonggang Wang, Konrad Kosiba
Summary: In this study, the strain rate and temperature dependence of the dynamic compressive properties of SLM-TC4 alloy were investigated through high speed impacting tests. The results showed that the yield strength and ultimate compressive strength of the alloy increased with increasing strain rate and decreasing temperature, indicating significant strain rate and temperature sensitivities. The texture of the alloy was significantly intensified by the high speed impacting load. Adiabatic shear bands were more likely to evolve at higher temperatures and strain rates, leading to the formation of submicron equiaxed grains. The findings in this study provide a theoretical basis for understanding the deformation behavior and mechanism of SLM-TC4 alloy under impacting loads, contributing to the wider application of SLM technique and products.
ADDITIVE MANUFACTURING
(2022)
Article
Materials Science, Multidisciplinary
Lan Yan, Anna Jiang, Yaning Li, Tian Qiu, Feng Jiang, Hong Xie, Fuzeng Wang, Xian Wu, Yong Zhang
Summary: In this study, the dynamic mechanical properties of Ti-6Al-4V titanium alloy were tested using a high temperature split Hopkinson pressure bar system, and the sensitivity of strain and temperature was analyzed. The influence of temperature-dependent specific heat capacity on adiabatic temperature rise was considered, and constitutive models were fitted using true stress-strain isothermal curves.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Materials Science, Multidisciplinary
Junchen Li, Xiangchen Meng, Yulong Li, Long Wan, Yongxian Huang
Summary: Friction stir extrusion is a severe plastic deformation process proposed to fabricate high strength-and-ductility rare-earth containing Mg alloys, resulting in grain refinement and homogeneous dispersion of second-phases under the coupling thermo-mechanical effect, leading to improved mechanical properties of the alloy.
Article
Engineering, Manufacturing
Chi Chen, Yazhou Guo, Jun Liu, Jingyu Yu, Yulong Li, Xiaochuan Liu, Fahad Raza
Summary: This paper studied the impact load and damage mechanism of a 4.78kg quad rotor UAV through numerical modeling and experimental validation. The study found that the speed, heading angle, and pitch angle of the UAV have a significant impact on the collision outcome.
INTERNATIONAL JOURNAL OF CRASHWORTHINESS
(2022)
Article
Engineering, Mechanical
Hongsheng Yang, Yulong Li, Fenghua Zhou
Summary: This study investigates stress wave generation and propagation in a semi-infinite Rayleigh-Love rod due to impact using analytical methods. Three specific problems were solved and explicit analytical solutions were obtained which agree well with numerical simulations. The hyper-viscoelasticity property of a Rayleigh-Love rod is highlighted and dispersive features of stress wave generation and propagation are demonstrated through examples.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2022)
Article
Materials Science, Composites
Xianghao Meng, Jin Li, Hao Cui, Chao Zhang, Zhongbin Tang, Yulong Li
Summary: The shear failure behavior of CF/ZnO NW/epoxy resin hierarchical composites and its dependency on strain rate were investigated in this study. The results showed a positive strain rate dependency of the interlaminar shear strength (ILSS). Additionally, longer and denser ZnO NWs were found to provide better enhancement effects.
COMPOSITES SCIENCE AND TECHNOLOGY
(2022)
Article
Nanoscience & Nanotechnology
Wendi Shi, Siyu Lu, Jianghua Shen, Biao Chen, Junko Umeda, Qiuming Wei, Katsuyoshi Kondoh, Yulong Li
Summary: The study found that increasing oxygen content in commercial purity titanium can lead to adiabatic shear failure, while the texture or grain orientation of the material has a profound influence on the formation of ASB. Microstructural examinations of high oxygen CP-Ti showed the formation of uniform and equi-axed nano-grains within the ASB.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Peng Gao, Zihao Ma, Ji Gu, Song Ni, Tao Suo, Yulong Li, Min Song, Yiu-Wing Mai, Xiaozhou Liao
Summary: In this study, a bulk CrCoNi medium-entropy alloy was found to exhibit exceptional combination of high strength and excellent ductility under high strain rates and low temperatures. This was mainly attributed to profuse deformation twinning and other factors contributing to grain refinement, work hardening, and excellent tensile strain.
SCIENCE CHINA-MATERIALS
(2022)
Article
Materials Science, Ceramics
Minjie Wang, Jianghua Shen, Biao Chen, Yunfei Wang, Junko Umeda, Katsuyoshi Kondoh, Yulong Li
Summary: The study showed that the strengthening capability of CNTs/Al decreased compared to PBM Al with increasing temperature and decreasing loading rate. However, CNTs played a crucial role in hindering dislocation movement and stabilizing the microstructure, leading to increased strength in Al-based MMCs. Experimental results also revealed improved strain rate sensitivity and reduced activation volume in CNTs-reinforced Al composites compared to pure aluminum.
CERAMICS INTERNATIONAL
(2022)
Article
Engineering, Manufacturing
Rui He, Yidi Gao, Longfei Cheng, Hao Cui, Yulong Li
Summary: This paper characterizes the dynamic fracture toughness of laminated composites in fibre kinking mode and its evolution with crack growth at high loading rates. The study found that the fracture toughness remains constant at the initiation of fibre kinking damage, but decreases noticeably during the kinking band growth stage at higher loading rates. Two different types of damage evolution were observed depending on the amount of delamination involved.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2022)
Article
Mechanics
Bin Jiang, Muhammad Atif, Yi Ding, Yazhou Guo, Yulong Li
Summary: Understanding the dynamic tensile behavior of glasses is crucial for designing impact-resistant transparent structures. This study investigated the effects of loading rate, specimen size, and stress wave on the dynamic tensile behavior of brittle glass.
ENGINEERING FRACTURE MECHANICS
(2022)
Article
Mechanics
Hongsheng Yang, Fenghua Zhou, Yulong Li, Yuxuan Zheng
Summary: This paper investigates the Taylor impact problem of an elastic rod with finite length using the 1D Rayleigh-Love rod theory, incorporating transverse inertia effects. Solutions for the transient responses of the rod are obtained through Laplace transform method. The study calculates the rebound time, coefficient of restitution, and impact-induced lateral additional stress, showing that local tensile stress can significantly damage brittle rods. The analytical results are in good agreement with finite element simulations, providing a theoretical basis for failure analysis of brittle materials under Taylor impact.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2022)
Article
Engineering, Mechanical
Bin Jiang, Jiayi Hu, Yazhou Guo, Jian Li, Yi Ding, Qiuming Wei, Tao Suo, Yulong Li
Summary: The impact strength of brittle solids is traditionally measured using the SHPB technique, which generates a single stress wave loading on the specimen. However, experiments using the newly developed ESHPB technique, which launches multiple stress pulses simultaneously, revealed significant discrepancies in the measured compressive strength. The loading stress waves were found to largely determine the compressive strength, suggesting that the method of loading stress waves plays a crucial role in measuring the impact strength of brittle solids.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2022)
Article
Physics, Applied
T. Z. Shen, H. Y. Song, M. R. An, Y. L. Li
Summary: This study investigates the effects of twin boundary spacing and nickel concentration on the mechanical properties and deformation behavior of nano-twinned HEA through molecular dynamics simulation. The results show that the decrease in twin boundary spacing causes the average flow stress of the HEA to change from strengthening to softening, and the nickel concentration can also affect the mechanical properties of the HEA.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Nanoscience & Nanotechnology
Dongyang Qin, Feng Zhao, Yulong Li
Summary: In this paper, a homogeneous bimodal Ti-5553 alloy with a prior-beta grain size of 15 μm is successfully fabricated through elaborate thermo-mechanical processing in the alpha+beta field, solution, and aging. The strength and ductility of the alloy are explored at various aging temperatures. The study finds that the achievable yield strength and tensile elongation of the alloy aged at 500 degrees Celsius are 1430 MPa and 9.5%, respectively. The strength of the bimodal alloy aged at 620 degrees Celsius first increases with aging time, reaches a maximum value of 1079 MPa after 2 hours, and then remains constant. Surprisingly, the tensile elongation of the bimodal alloys aged at 620 degrees Celsius is the same as that of the solution-treated alloy. Aging at 700 degrees Celsius does not have a strengthening effect but improves the alloy's ductility. The precipitation kinetics of grain boundary alpha (α(GB)) precipitation is more active than that of intragranular alpha (α(Intra)) precipitation within the aging temperature range of 500 degrees Celsius to 700 degrees Celsius. However, α(GB) precipitation does not contribute to strengthening the alloy. The yield strength of the bimodal Ti-5553 alloy depends on the dislocation density of the beta phase and the size effects of the prior beta grains. The ductility of the alloy is influenced by the plasticity of α(GB) and the stress concentration at the beta/α(Intra) interface. The combination of strength and ductility in the high-strength bimodal Ti-5553 alloy can be further improved by optimizing the thickness of α(GB).
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Computer Science, Interdisciplinary Applications
Bao Zhang, Ke Jin, Yong Kou, Xiaojing Zheng, Yulong Li
Summary: When conductors are subjected to powerful impulse current, high-velocity friction, and a strong time-dependent magnetic field, the response of the structure is significantly influenced by these extraordinary environments. A transient multi-field coupling mathematical model is proposed to study the magnetic field, thermal field, and structural deformation, as well as their coupling characteristics. The model considers the effects of multi-field coupling and structural deformation, resulting in a more accurate description of the magneto-electro-thermo-mechanical response, multiphysics characteristics, and velocity skin effects. Experimental validation confirms the accuracy of the model.
COMPUTERS & STRUCTURES
(2022)
Article
Construction & Building Technology
Liangliang Xu, Yu Duan, Yulong Li
Summary: This study investigated the effects of porosity, gradient, and impact velocity on the mechanical behavior and deformation mechanism of foamed concrete. It found that compressive strength increases with decreasing porosity, and that foamed concretes with similar porosity but different pore sizes and distances exhibit consistent stress-strain curves. Graded foamed concrete generates initial deformation in the region with the highest porosity under an impact velocity of 1 m/s.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
