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Fatigue Damage Mechanism of Oil Film Bearing Sleeve

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Journal of Iron and Steel Research International 2007年第1期14卷 60-63,68页

作者： huang qing-xue WANG Jian-mei MA Li-feng ZHAO Chun-jiang School of Mechanical and Electrical Engineering Taiyuan University of Science and Technology Taiyuan 030024 Shanxi China School of Mechanical Design and Automation Taiyuan University of Technology Taiyuan 030024 Shanxi China

With the rapid development of the steel industry, to keep pace with the current trend of high speed, continuous, and large-scale production that focuses on automation and high levels of efficiency, many state-owned steel companies are being equipped with oil film bearings. Through long-term on-spot inspection and research on the fatigue failure of oil film bearing, three segments of annulated fatigue breakage were found axially along the inner surface of the bearing sleeve. In order to elucidate the reason for the three-segment annulated damage under rolling load, numerical boundary element method was adopted to analyze the contact behaviors between the sleeve and rollneck. Failure mechanism was discussed in detail, the distributions of contact stress were analyzed, and the service lives of the sleeve for different positions on the inner surface were quantitatively described, which provided an effective means to decrease wear and adhesive damage of the sleeve and to increase the load capacity of oil film bearing and its service life as well.

关键词： oil film bearing fatigue failure analysis contact problem bearing life

Simulation of Strip Rolling Using Elastoplastic Contact BEM With Friction

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Journal of Iron and Steel Research International 2008年第1期15卷 34-38页

作者： LI Yu-gui huang qing-xue SHEN Guang-xian XIAO Hong PANG Si-qin WANG Jian-mei College of Material and Science Engineering Taiyuan University of Science and Technology Taiyuan 030024 Shanxi China College of Machinery Engineering Yanshan University Qinhuangdao 066004 Hebei China College of Machinery and Vehicle Engineering Beiiing Institute of Technology Beijing 100081 China

With rollers as elastic bodies and workpieces as elastoplastic bodies,the rolling problem can be viewed as a friction elastic-plastic contact *** fewer assumptions in the simulation of strip-rolling process,a boundary element method（BEM）for two-dimensional elastoplastic finite strain and finite deformation analysis of contact problems with friction was *** the equations for contact problems,which include multi-nonlinearities,were *** and iterative procedures were used to find contact pressure and friction ***,initial strain rate algorithm and work-hardening material behavior can be assumed in the plastic *** examples were presented,and the results of contact pressure and friction stress were in excellent agreement with those of analysis.

关键词： boundary element method contact problem elastoplastic finite deformation rolling

Mechanical Properties of New Type Negative Offset Structure During Shearing Process of Heavy Steel Plate

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Journal of Iron and Steel Research International 2007年第5期14卷 31-35页

作者： MA Li-feng huang qing-xue WANG Jian-mei YANG Jian-wei LI Ying LI Jin-bao School of Material Science and Engineering Taiyuan University of Technology Taiyuan 030024 Shanxi China School of Mechanical Engineering Taiyuan University of Science and Technology Taiyuan 030024 Shanxi China Computer Institute Defense Chemical Command Engineering College of PLA Beijing 100000 China

According to the revised Cailikefu＇s rolling shear force formula, motion path equation of spatial seven-bar path was built, and a mechanical model, with the new structural feature of negative offset, was thus successfully established for 2 800 mm heavy shear of some iron and steel company. Shear and bar forces of steel plate, before and after the adoption of negative offset structure, were analyzed, as well as horizontal force component of mechanism that influences pure rolling shear and back-wall push force that keeps blade clearance. It was found that the back-wall push force keeps large even at the time that the maximum rolling shear was obtained; meanwhile, back-wall push force is the most approximate to side forces when 60--100 mm of offset was adopted. Both theoretical results and onsite shear quality show that the negative offset plays an important role in ensuring the stability of pure rolling shear and keeping blade clearance constant.

关键词： rolling shear mechanical model mechanical property blade clearance negative offset shear quality

Finite Element Method Analysis of Effect of Blade Clearance on Plate Shearing Process

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Journal of Iron and Steel Research International 2012年第10期19卷 26-29页

作者： LI Yu-gui, YE Quan, FAN Fei, BAO Ye, huang qing-xue (Taiyuan University of Science and Technology, Taiyuan 030024, Shanxi, China) Taiyuan University of Science and Technology Taiyuan Shanxi China

Blade clearance is an important technical parameter of the shear, which determines the shear quality of plate. The finite element method was used to simulate shearing process which is in the different specifications and blade clearances, and the impact on blade section and shearing force of blade clearance was analyzed. Comparing with traditional experience formulas and measured values, the limitations of the experience formulas were proved. And by contrasting with the shearing force data collected from Linfen Iron and Steel Company, the reliability of the finite element method was further proved. The simulated results show that the simulated values controlled by ductile fracture criterion and measured values are very close, and the deviation value is in the range of 4.8%-20.8%. For the same steel, if the plate is thicker, the blade clearance will be greater, and thickness and blade clearance are approximately linear. The difference between numerical simulation of the maximum shearing force and the measured results is 7.7% to 12.0%, and the simulation results are close to facts. With the increase of blade clearance and the thickness, the shearing force was increased to some degree.

关键词： blade clearance finite element method experience formula shearing section shearing force

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纠错组码的一个界

高校应用数学学报（A辑） 2005年第3期20卷 365-370页

作者：黄庆学浙江大学数学系浙江杭州310027

给出了完全多部图覆盖与纠错组码的一种一一对应关系,从而利用huang(1996)的一个结果给出了纠错组码的一个界,并利用仿射设计给出了使这个界的等号成立的一族线性码.

关键词：纠错组码仿射设计完全多部图分解

Establishment of Optimal Blade Clearance of Stainless Steel Rolling-Cut Shear and Test of Shearing Force Parameters

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Journal of Iron and Steel Research International 2012年第9期19卷 52-61页

作者： MA Li-feng 1 , 2 , huang qing-xue 1 , huang Zhi-quan 1 , CHU Zhi-bing 1 , TIAN Ya-qin 1 ( 1.College of Material Science and Engineering , Taiyuan University of Science and Technology , Taiyuan 030024 , Shanxi , China 2.Superplastic and Plastic Research Institute , Jilin University , Changchun 130025 , Jilin , China ) College of Material Science and Engineering Taiyuan University of Science and Technology Taiyuan Shanxi China Superplastic and Plastic Research Institute Jilin University Changchun Jilin China

The purpose aims to improve the plate shearing section quality and metal yield by means of optimal blade clearance adjustment model of rolling-cut shear and accurate calculation of the maximum shearing force , as well as for the system optimization design , structure optimization design to provide important basis.A 3 500mm rolling shear of a large stainless steel factory was taken as the test object , and the blade clearance under different influence factors of the clearance value and the shearing section were *** optimized production accumulated data regression analysis and the rolling shear process of stainless steel shear *** test results show that the optimal blade clearance adjustment module is a comprehensive function , which include steel plate thickness , material , temperature and shear plate *** shear stress at starting stage with the relative penetration depth increases affected by the above factors , and the fracture peak decreases rapidly after being cut into the roll phase constant.

关键词： stainless steel rolling-cut shear blade clearance shearing force industrial test

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完全k一致超图的k团分划

浙江大学学报（理学版） 2005年第4期32卷 361-363,368页

作者：黄庆学浙江大学数学系浙江杭州310027

作为完全图的最优完全二部图分解的推广,引进了完全k一致超图的最优k团分划的新概念;并对k=3推广了Graham-Pollak定理,给出了这种情形的特性;同时,对一般情形给出了最优k团分划的一个上界.

关键词：超图完全k一致超图 k团分划

Preparation of FeCoNi medium entropy alloy from Fe^(3+)-Co^(2+)-Ni^(2+)solution system

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International Journal of Minerals,Metallurgy and Materials 2025年第1期32卷 92-101页

作者： Zongyou Cheng qing Zhao Mengjie Tao Jijun Du Xingxi huang Chengjun Liu Key Laboratory for Ecological Metallurgy of Multimetallic Mineral(Ministry of Education) Northeastern UniversityShenyang 110819China School of Metallurgy Northeastern UniversityShenyang 110819China Engineering Research Center of Frontier Technologies for Low-carbon Steelmaking(Ministry of Education) Shenyang 110819China

In recent years,medium entropy alloys have become a research hotspot due to their excellent physical and chemical *** controlling reasonable elemental composition and processing parameters,the medium entropy alloys can exhibit similar properties to high entropy alloys and have lower *** this paper,a FeCoNi medium entropy alloy precursor was prepared via sol-gel and coprecipitation methods,respectively,and FeCoNi medium entropy alloys were prepared by carbothermal and hydrogen *** phases and magnetic properties of FeCoNi medium entropy alloy were *** showed that FeCoNi medium entropy alloy was produced by carbothermal and hydrogen reduction at 1500℃.Some carbon was detected in the FeCoNi medium entropy alloy prepared by carbothermal *** alloy prepared by hydrogen reduction was uniform and showed a relatively high ***,the hydrogen reduction product exhibited better saturation magnetization and lower coercivity.

关键词： medium entropy alloy sol-gel co-precipitation carbothermal hydrogen reduction

N-乙酰半胱氨酸改良树脂基质材料细胞毒性的研究进展

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中华口腔医学杂志 2011年第5期46卷 315-317页

作者：黄雪清黄翠孙华岭武汉大学口腔医学院口腔基础医学省部共建国家重点实验室培育基地和口腔生物医学教育部重点实验室 430079 武汉大学口腔医学院修复科 430079

随着口腔材料学的不断发展，树脂基质材料与牙髓、牙龈以及根尖周组织接触的概率大大增加，其安全性一直为人们所关注。然而，动物和人体组织病理学研究均发现树脂材料的单体成分可引起细胞基本结构，如细胞膜完整性和细胞功能酶活性改... 详细信息

随着口腔材料学的不断发展，树脂基质材料与牙髓、牙龈以及根尖周组织接触的概率大大增加，其安全性一直为人们所关注。然而，动物和人体组织病理学研究均发现树脂材料的单体成分可引起细胞基本结构，如细胞膜完整性和细胞功能酶活性改变，导致细胞死亡；

关键词：树脂材料细胞毒性 N-乙酰半胱氨酸基质材料改良单体成分口腔材料学根尖周组织