Lei Gu

Sichuan University

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i-10 index

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Co-Authors

Yonghao Zhao

Nanjing University of Science and Technology

Ningning Liang

Nanjing University of Science and Technology

Xiang Chen

Jiangnan University

Ao Meng

Anhui Polytechnic University

Qingzhong Mao

Nanjing University of Science and Technology

Zhongliang Deng

Beijing University of Posts and Telecommunications

Takeshi Ikenaga

University of Toyama

Wenliang Lin

Beijing University of Posts and Telecommunications

Jihua Liu

Wuyi University

Xiaoyi Yu

Jilin University

Cooperative Institutions

Nanjing University of Science and Technology

Chinese Academy of Sciences

Sichuan University

Hohai University

Beijing University of Posts and Telecommunications

Huazhong University of Science and Technology

Shanghai University

Ministry of Industry and Information Technology

University of Chinese Academy of Sciences

Peking University

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Effect of Strain Rate on Mechanical Properties of Fe-30Mn-3Si-4Al TWIP Steel

Advanced materials research (2012)

Zhiping Xiong Lei Gu Ye Ke Wang Ji‐Cheng Zhao Wei Bao

Influence of strain rate on mechanical properties of Fe-30Mn-3Si-4Al TWIP steel was studied by compression experiments, indicating that TWIP steel has strain rate softening effect, strain rate insensitivity, and also strain rate hardening effect. According to strain rate sensitivity m changing with strain rate, effect of strain rate on TWIP steel mechanical properties can be divided into three stages: quasi-static stage with strain rate ranging from 0.001 to 100 1/s; high-strain rate stage with strain rate ranging from 701 to 5108 1/s; super-high-strain rate stage with strain rate ranging from 10335 to 30147 1/s. Adiabatic temperature rise tends to increase with strain rate. Strain hardening exponent is divided into three parts: dislocation strengthening stage, twinning strengthening stage and thermal softening stage.

Twip

Strain (injury)

Strain hardening exponent

10.4028/www.scientific.net/amr.581-582.1018

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Citations (2)

Development of adaptive p-step RBF network model with recursive orthogonal least squares training

Neural Computing and Applications (2016)

Lei Gu D.K. Siong Tok Dingli Yu

Hierarchical RBF

Least-squares function approximation

10.1007/s00521-016-2669-x

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Citations (14)

The Analysis and Design of WTN Chess Algorithm

Applied Mechanics and Materials (2014)

Wen Min Zhou Shu Qin Li Lei Gu Yu Shi Zhan Yu Li

Recently,WTN chess is just emerging as a computer game of Artificial Intelligence Competition in China which lacks of algorithm research. This article attempts to research how to get rid of randomness in the game of WTN chess and lets the program make the right choice to analysis and return a relatively best solution.This article also achieves a greedy algorithm based on enumeration and offensive strategies, and provides an algorithm of situation assessment.It is demonstrated that the algorithm is effective.

Offensive

10.4028/www.scientific.net/amm.513-517.1696

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Wireless Sensor System of UAV Infrared Image and Visible Light Image Registration Fusion

Journal of Electrical and Computer Engineering (2022)

Lei Gu Juan Meng

The application of multisource sensors to drones requires high-quality images to ensure it. In simultaneous interpreting two or more multisensor images based on the same scene or target, the image obtained by the UAV sensor is limited by the imaging time and the shooting angle. The images obtained may not be aligned in the spatial position, thus affecting the fusion effect. Therefore, different sensor images must be registered before image fusion. During the shooting process of the drone imaging sensor, imaging angle, and environmental conditions, the obtained various sensor images will have rotation, translation, and other deformations in the spatial position so that they do not reach the spatial position. Therefore, it is impossible to directly perform image fusion directly. Therefore, before the multisensor image fusion, the image registration process must be completed to ensure that the two images are aligned in space. This paper analyzes the principles; based on the principles of the Powell search algorithm and improved walking algorithm, an algorithm combining Powell and improved walking algorithm is proposed. This paper also studies several traditional image neutrosophic fusions. The algorithm combines the fusion optimization algorithm proposed in this paper greatly reduces the calculation speed and improves the performance of the optimization algorithm and success rate.

Position (finance)

Image registration

Drone

Sensor Fusion

10.1155/2022/9245014

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Citations (4)

An exceptionally wear-resistant CoFeNi2 medium entropy alloy via tribo-induced nanocrystallites with amorphous boundaries

Applied Surface Science (2022)

Ao Meng Fei Liang Lei Gu Qingzhong Mao Yaping Zhang

High-Entropy Alloys

10.1016/j.apsusc.2022.156102

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Citations (11)

Using Physical Models in Improving Low Visualizers' Spatial Visualization Skills

Lei Gu

Abstract Spatial Visualization skills are essential for successes in engineering education. These skills can be improved in engineering design graphics education. Due to multiple factors, engineering design graphics education has evolved from manual drafting technique to more computer aided design oriented education. Improving engineering students’ spatial visualization skill heavily depends on isometric pictorials in engineering graphics textbooks and 3D modeling software. Meanwhile, recent research reports that low visualizers cannot significantly increase their examination scores with extra practice in engineering design graphics courses. Two engineering graphics design courses are offered to engineering students at a two-year college that is embedded in a four-year public institution. Engineering Graphics & Design I is the first course in a two-course sequence. Topics include but are not limited to fundamentals of engineering graphics: including orthographic projection and 2D drawing using AUTOCAD. Engineering Graphics & Design II introduces the principles of computer-assisted graphics and engineering design, with an emphasis on 3D modeling techniques, using Inventor. This paper discusses how to improve students’ spatial visualization skills by using physical models to produce orthographic views. The target group for this study is engineering students in two-year college who are deficient in spatial visualization skills. Subsequently, they perform poorly in both Engineering Graphics & Design I & II courses. Low visualizers are identified based on their score (less than 75%) on the first orthographic projection examination. Premade plastic physical models which include typical 3D features such as normal surfaces, inclined surfaces, oblique surfaces and hidden surfaces/lines are offered to students who volunteer to participate for these extra hands-on activities. Students who take the assignments seriously show dramatic increases in their final examination scores. This paper describes the methodology of the study and outcome of hands-on activities by using physical models to improve spatial visualization skills.

10.18260/1-2--29085

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Study of the Preparation and Degradable Characteristics of CaCO<sub>3</sub>-PE Film

Advanced materials research (2012)

Xue Yong Zhou Xiang Yun Liu Lei Lu Lei Gu Jingjing Liu

The CaCO 3 -polyethylene (PE) film was prepared by filling method, and the filling amount of calcium carbonate in film was 20%(w/w). The effects of natural weathering, ultraviolet light irradiation on the tensile strength, breaking elongation and molecular weight of the CaCO 3 -PE film was investigated comparing with the photosensitizer-PE film. After being located in the open air for 30 d, the average tensile strength, average breaking elongation and the mean molecular weight of CaCO 3 -PE film decreased 80.6%, 99.3% and 25.3%, respectively, as for the photosensitizer-PE film, the corresponding items decreased 18.8%, 45.0% and 11.7%, respectively. After ultraviolet light irradiation for 120 h, the average tensile strength of CaCO 3 -PE film decreased 29.9%, the average tensile strength of the photosensitizer-PE film, however, increased 20.5%. The average breaking elongation of CaCO 3 -PE film and photosensitizer-PE film decreased 97.3% and 84.1% respectively, the mean molecular weight of both films decreased 66.7% and 26.6% respectively. After covered by soil for 200 d, the weight loss of the CaCO 3 -PE film and photosensitizer-PE was 2.15% and 0.22%, respectively. The results showed that the degradability of CaCO 3 -PE film is superior to the photosensitizer-PE film.

Elongation

Ultraviolet

Ultraviolet light

10.4028/www.scientific.net/amr.499.85

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Experimental Research on Turning Ni-Based Superalloy with MQL Using Organic Alcohols

Applied Mechanics and Materials (2014)

Hui Wang Fu Sheng Ni Lei Gu

The machinability of Nickel-based superalloy GH4169 is poor. The traditional method to machining is to apply cutting fluids with the active additives, which, however, cause environmental pollution and health problems. In this paper, the MQL using organic alcohols, instead of cutting fluids, was applied on turning for the aim of green cutting GH4169. The effects of MQL, wet and dry cutting on cutting force and the chip deformation have been examined with coats carbide tools YBC251. The results of experiments indicated that the application of MQL produced lower cutting force with about 20 percent reduction compared to dry cutting, and it is advantageous in chip curl. The research results show that clean production was achieved in metal cutting associated with MQL using alcohols for cooling and lubricating.

Machinability

Cutting fluid

Chip formation

Environmental Pollution

10.4028/www.scientific.net/amm.633-634.642

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Damage Detection of Filament Wound Composite Cylinder Using Ultrasonic Waves

Applied Mechanics and Materials (2012)

Lei Gu Ke Gong Guiyun Gao Zheng Li

This paper experimentally investigates the damage detection of filament-wound (FW) thick-wall composite cylinder using ultrasonic waves. The multi-layered cylinder has a 20 mm-thick steel liner with an inner radius of 421 mm, an 11 mm-thick layer of unidirectional carbon fiber reinforced composite that is wound on the steel liner, and a 2.15 mm-thick layer of coating over the composites. Damages are pre-manufactured in different wall depths of the cylinder. The main damages to be detected include the defects in the composite layer, the interface debonding between the composite layer and the steel liner, and the change of thickness of the steel liner due to corrosion. To interrogate above mentioned damages, the longitudinal waves are excited using an ultrasonic transducer in pulse-echo mode along the radial direction of the cylinder. The continuous wavelet transform (CWT) is used to analyze the reflected-ultrasonic signals in order to obtain the Time-of-Flight (ToF) and the amplitude ratio of different interfaces. Based on the ToF and amplitude ratios, the location and size of the damages are identified and the thickness of the steel liner is determined. Experimental results show that the ultrasonic pulse-echo technique combined with the CWT is feasible in damage detection of multi-layered filament-wound composite cylinder especially when a coating layer exists.

Filament winding

Carbon steel

10.4028/www.scientific.net/amm.249-250.856

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Citations (2)

Unlocking wear resistance in an ultrastrong dual-phase high-entropy alloy by interface-constrained deformation of brittle Laves phases

Friction (2024)

Fei Liang Yixing Sun H.Y. Wan Yong Li Wenhao Lu

Abstract The pronounced brittleness of hard Laves phase intermetallics is detrimental to their tribological properties at room temperature. In this study, we utilized a heterogeneous structure to engineer an ultrastrong dual-phase (Laves + B2) AlCoFeNiNb high-entropy alloy that exhibits a low wear rate (3.82×10 −6 mm 3 /(N·m)) at room temperature. This wear resistance in the ball-on-disc sliding friction test with the counterpart of Al 2 O 3 balls stems from the activated deformation ability in the ultrafine Laves lamellae under heterogeneous interface constraints. Furthermore, as tribological stress intensifies, the surface deformation mechanism transitions from dislocation slip on the basal and pyramidal planes to a unique combination of local shear and grain rotation within the Laves phase. Our study illuminates fresh perspectives for mitigating the embrittling effect of Laves phase intermetallics under tribological loading and for the development of wear-resistant materials.

Laves phase

Brittleness

High-Entropy Alloys

Deformation mechanism

10.1007/s40544-024-0884-5

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