Lu Huang

China Electronics Technology Group Corporation

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Dan Guo

Civil Aviation University of China

Shizhu Wen

Tsinghua University

George T. Y. Wan

Tsinghua University

Guoxin Xie

Tsinghua University

Ming Shi

Xiang Liu

Hubei University of Science and Technology

Ming Shi

Nanjing Normal University

Guofei Chen

Ningbo Institute of Industrial Technology

Xin Pei

Nanjing University of Aeronautics and Astronautics

Humberto Terrones

Rensselaer Polytechnic Institute

Cooperative Institutions

Tsinghua University

Chinese Academy of Sciences

The University of Texas at Dallas

Nankai University

Pennsylvania State University

Collaborative Innovation Center of Chemical Science and Engineering Tianjin

National Institute of Metrology

Sichuan University

Shinshu University

Institute for Scientific and Technological Research

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A simplified stress-based forming limit criterion for advanced high strength steel (AHSS)

IOP Conference Series Materials Science and Engineering (2018)

Brandon M. Hance Lu Huang

A methodology for stress-based forming limit analysis has been developed for advanced high strength steel (AHSS). It was proposed that localized necking occurs when a critical normal stress condition is met. Using a basic, isotropic material model (von Mises, power law hardening), the criterion was applied to various 980 Class AHSS. In most cases the simplified criterion adequately described the experimental strain-based forming limit curve (FLC). For AHSS with substantial volume fractions of metastable austenite, a more sophisticated material model and/or an adapted failure criterion will be required. A strong linear relationship was found between the critical normal stress and the measured true stress at maximum load in tension. This empirical functionality applies over a large range of strength levels and may form the basis for a methodology by which FLCs may be estimated from standard tension tests. Finally, in the context of the proposed failure criterion, the effects of work hardening behavior on the "shape" of the strain-based FLC are explored.

Necking

Hardening (computing)

Strain hardening exponent

10.1088/1757-899x/418/1/012037

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Citations (4)

Forming Limit Curves of Advanced High Strength Steels: Experimental Determination and Empirical Prediction

SAE International Journal of Materials and Manufacturing (2018)

Lu Huang Ming Shi

High strength steel

10.4271/2018-01-0804

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Citations (4)

Effect of graphene lateral size on the microstructure and properties of graphene/copper composites

International Journal of Modern Physics B (2019)

Dandan Zhang Xiao Hua-xing Wei Jiang Xia Cao Manyu Ye

Copper matrix composites reinforced with graphene nanoplatelets (GNPs) were prepared by vacuum hot pressing of ball milled mixtures of powders. Two grades of GNPs were used; one with average thickness of 2 nm and average lateral size of 6 [Formula: see text]m and another with much larger lateral size of 80 [Formula: see text]m. Microstructure and properties of as-prepared composites containing 10 vol.% GNPs were studied. The GNPs sheets are uniformly distributed and well aligned in the Cu matrix. The microstructure observation shows that the GNPs-2–6 exhibits a better dispersion in the Cu matrix than GNPs-2–80. The addition of fine GNPs-2–6 lead to [Formula: see text]31% higher tensile strength and approximately same electrical conductivity of the Cu matrix, while the GNPs-2–80/Cu composite only shows a [Formula: see text]15% increase of tensile strength and a lower electrical conductivity than the Cu matrix.

Matrix (chemical analysis)

Hot pressing

10.1142/s0217979220400457

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Citations (3)

Experimental Characterizations of the Fracture Data of a Third Generation Advanced High Strength Steel

SAE technical papers on CD-ROM/SAE technical paper series (2020)

Lu Huang Ming Shi D.G. Crosby

High strength steel

10.4271/2020-01-0205

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Citations (0)

Validation of GISSMO Model for Fracture Prediction of a Third-Generation Advanced High-Strength Steel

SAE International Journal of Materials and Manufacturing (2018)

Xiaohong Chen Guofei Chen Lu Huang

High strength steel

Model Validation

10.4271/2018-01-0107

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Citations (25)

Study on Application of High Thermal Conductivity Graphite Foam

Lecture notes in electrical engineering (2022)

Xiangjv Kong Lu Huang Shangkun Zhu

10.1007/978-981-19-1309-9_142

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Citations (1)

Thermal Oxidation Mechanism of Polyalphaolefin Greases with Lithium Soap and Diurea Thickeners: Effects of the Thickener

Tribology Transactions (2016)

Lu Huang Dan Guo Philippa Cann George T. Y. Wan Shizhu Wen

In this work, lithium and diurea greases formulated by poly-alpha-olefin were aged up to 1,200 h in an oven at 120°C and periodically taken out for testing. Scanning electron microscopy (SEM) and infrared (IR) spectra proved that both physical and chemical degradation occurred during the thermal aging process, such as a decrease in apparent viscosity, thickener destruction, and change in chemical species. Diurea grease showed much better anti-oxidation performance during thermal aging than lithium grease. A dual effect of thermal aging on the grease lubricity was observed and analyzed. Results showed that early oxidation might reduce grease lubricity due to the formation of ketones and aldehydes, and the decrease in grease viscosity and oil bleeding due to thickener destruction would contribute to better replenishment.

Grease

Lubricity

Thermal oxidation

Degradation

Asphaltene

10.1080/10402004.2015.1106632

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Citations (24)

Three-dimensionally bonded spongy graphene material with super compressive elasticity and near-zero Poisson’s ratio

Nature Communications (2015)

Yingpeng Wu Ningbo Yi Lu Huang Tengfei Zhang Shaoli Fang

It is a challenge to fabricate graphene bulk materials with properties arising from the nature of individual graphene sheets, and which assemble into monolithic three-dimensional structures. Here we report the scalable self-assembly of randomly oriented graphene sheets into additive-free, essentially homogenous graphene sponge materials that provide a combination of both cork-like and rubber-like properties. These graphene sponges, with densities similar to air, display Poisson's ratios in all directions that are near-zero and largely strain-independent during reversible compression to giant strains. And at the same time, they function as enthalpic rubbers, which can recover up to 98% compression in air and 90% in liquids, and operate between -196 and 900 °C. Furthermore, these sponges provide reversible liquid absorption for hundreds of cycles and then discharge it within seconds, while still providing an effective near-zero Poisson's ratio.

Poisson's ratio

Elasticity

Auxetics

Rubber elasticity

10.1038/ncomms7141

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Citations (523)

Dynamical wear prediction along meshing path in mixed lubrication of spiral bevel gears

Advances in Mechanical Engineering (2014)

Xin Pei Lu Huang Wei Pu Pengchong Wei

Surfaces of gears under combined rolling and sliding motions may suffer a complicated wear process due to the transient time-varying effect along the meshing path. In this paper, a methodology for predicting the wear of tooth surfaces is developed for the spiral bevel gears. In the wear model, the machined surface roughness, mixed lubrication, friction, flash temperature and the dynamic behavior of gears are all considered. Tooth-Contact-Analysis (TCA) method is used to get the time-varying parameters of meshing points along the meshing path. By simulating real movement process, the material is removed according to the Arrhenius equation. First, the distribution of pressure and film thickness is obtained by solving the mixed EHL model. After that, the flash temperature can be computed by the point heat source integration method with the obtained pressure, film thickness and velocity vector. The material removal is based on surface temperature and sliding distance. The numerical results are compared to the ball-on-disk experiments to demonstrate the reasonableness of the present wear model. And it shows that the angle difference between velocity vectors has strong influences on the wear profile. Furthermore, the mechanism of surface wear evolution is investigated systematically in spiral bevel gears. The difference of the wear track between the pinion and gear surfaces is observed. Besides, in the meshing process of tooth surface, the wear along the meshing path is uneven, which appears to be much greater at the engaging-in and engaging-out areas. There is a position with maximum wear rate in the meshing process, and the position is affected by the load and speed.

Pinion

Bevel gear

Ball (mathematics)

10.1177/1687814020958236

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Citations (5)

Infrared Thermography Investigation of an Evaporating Water/Oil Meniscus in Confined Geometry

Langmuir (2016)

Xiang Liu Lu Huang Dan Guo Guoxin Xie

To simulate the heat and mass transfer in real heterogeneous systems, such as metal-production processes and lubrication, the point-contact condition with the formation of narrowly confined liquid film and its surrounding meniscus was constructed to study the classical microchannel boiling problem in this work. Specifically, the evaporation and diffusion of the superheated water meniscus and water/oil droplet in the point-contact geometry were investigated. The emphasis is put on the influence of the contact-line transport behaviors on nucleation and bubble dynamics in the confined meniscus. The observations suggested that superheat is the necessary condition for bubble formation, and enough vapor supply is the necessary condition for bubble growth in the confined liquid. The oil film could significantly inhibit the evaporation and diffusion of water molecules in the superheat geometry. The water/oil droplet can exist for a long time even in the hot contact region, which could have sustained damages to the mechanical system suffering from water pollution. This work is of great significance to better understand the damage mechanism of water pollution to the mechanical system.

Meniscus

Bubble point

Water Transport

10.1021/acs.langmuir.6b03482

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Citations (2)