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| 1 | Research progress of aluminum alloy automotive sheet and application technology显示文摘Pretreatment technology is deeply discussed to explain its importance in guaranteeing properties and formability of aluminum alloy automotive sheet. Some typical applications of aluminum alloy automotive sheet to automotive industry are listed. Based on the author's knowledge and recognition and research progress presently, the important research contents about aluminum alloy automotive sheet are emphasized. Reducing cost and price of sheet and going deeply into application research are the main work for expending the application of aluminum alloy automotive sheet in the automobile. | Ma Mingtu You Jianghai Lu Hongzhou Wang Zhiwen | 2012 | Engineering Sciences2012，10，4： | 10 |
| 2 | On the automobile lightweight显示文摘The significance,description parameters,evaluation method,implement way and design for lightweight of automobile are comprehensively reviewed.The relationship among the performances of auto parts & components,the properties of materials and application of advanced technologies is also elaborated.According to recently related progress of lightweight and authors' research and developing work,lightweight of automobile is comprehensively and systematically overviewed. | Ma Mingtu Yi Hongliang Lu Hongzhou Wan Xinming | 2012 | Engineering Sciences2012，10，2： | 8 |
| 3 | Analysis of surface orange peel of aluminum-alloy automobile sheet by using of EBSD and X-ray diffraction显示文摘The formation cause of orange peel of aluminum-alloy automotive sheet after tensile deformation was analysed by using X-ray diffraction and electron back-scattered diffraction(EBSD).The test results showed that formation cause of surface orange peel after tensile deformation related to product texture and nonuniform deformation during the tensile process.The grain size has significant effect on deformation uniform and texture formation.Coarse grains were easy to produce nonuniform deformation and texture,which would produce surface orange peel after tensile deformation. | Ma Mingtu Sun Zhifu Wang Zhiwen Lu Hongzhou Zhou Mingbo | 2012 | Engineering Sciences2012，10，6： | 7 |
| 4 | Morphology observation for surface orange peel and fracture in tension sample of aluminum-alloy sheet and characterization of nano hardness显示文摘The tension property of aluminum-alloy sheet with different microstructures is measured,and the surface and tension fracture morphology of tension sample with and without orange peel are observed by using scanning electron microscope(SEM).Surface roughness and nano hardness of tension sample are measured.The results show that the average elongation of the samples with orange peel is lower than that without orange peel;especially the r value of perpendicular to the rolling direction is much lower than that without orange peel.The tension surface of the orange peel samples is very rough;various parameters of surface roughness are higher.Under the observation of SEM,a wider sliding band with a micro crack on the surface of orange peel sample can be found.The various parameters of surface roughness without orange peel sample are near to zero,the sliding band is narrow and without micro cracks.The dimple width in tensile fracture of orange peel sample is larger than that without orange peel sample,but shear lip is narrower.The nano hardness testing results show that samples with orange peel behave high elastic modulus,high hardness,and high maximum load,but low plastic deformation depth.These mentioned features can completely describe surface and fracture morphology of tension samples with orange peel. | Ma Mingtu Mei Huasheng Lu Hongzhou Yang Hongya Wu Emei Zhou Mingbo | 2012 | Engineering Sciences2012，10，6： | 4 |
| 5 | Research status and progress of hot stamping显示文摘In this article,current application,materials,key equipments,finite element(FE) simulation and parts properties of hot stamping are introduced.The investigations of all processes and further excellent processes are described.The survey of existing works,especially key equipments has revealed several gaps.Some new ideas and programs are proposed on the basis of traditional process.This article aims at providing an insight into a whole process backgrounds and pointing out the great potential for further investigations and innovations of hot stamping. | Song Leifeng Ma Mingtu Guo Yihui Fang Gang Liu Qiang Yao Zaiqi | 2012 | Engineering Sciences2012，10，6： | 4 |
| 6 | Numerical simulation of hot stamping of side impact beam显示文摘Ls-DYNA software is adopted to conduct research of numerical simulation on hot stamping of side impact beam to calculate the temperature field distribution,stress field distribution,forming limit diagram(FLD) figure,etc.in the course of hot stamping so as to predict and analyze the formability of parts.ProCAST software is employed to conduct research of numerical simulation on solid quenching course concerning hot stamping to calculate temperature field distribution of tools and component of multiple stamping cycles.The results obtained from numerical simulation can provide significant reference value to hot stamping part design,formability predication and tools cooling system design. | Guo Yihui Ma Mingtu Fang Gang Song Leifeng Liu Qiang Wang Xiaona Zhou Dianwu | 2012 | Engineering Sciences2012，10，6： | 4 |
| 7 | Comparison between the preparation,structure and mechanical properties of long fiber reinforced thermoplastics and short fiber reinforced thermoplastic显示文摘<正>This article summarizes the comparison between the preparation,structure and mechanical properties of long fiber reinforced thermoplastics(LFT) and short fiber reinforced thermoplastics(SFT).Both of the experiment and theory results showed that the mechanical properties of long glass fiber reinforced thermoplastics pellets(LGFRT) have been enhanced better than that of short glass fiber reinforced thermoplastics pellets(SGFRT) manufactured by molding procession.After regulation of the relative humidity by 50%,the mechanical properties of 30%(weight percent) short glass fiber content in SFT(SFT-PA6-SGF30) are similar to that of 40%long glass fiber content in LFT.However, the density of the latter is about 17%lower than that of the former.Thus,the corresponding weight of products is reduced by 13%;output rate is increased by 21%,and the cost is therefore significantly lowered.And it has the following advantages;impact strength is increased by 87%;the proportion is reduced by 20%;molding cycle is shortened by 10%;materials cost is saved by 20%~ 30%and the final total cost is saved by 30%~ 40%.So LFT (LFT-PP-LGF40 ) can replace SFT(SFT-PA6-SGF30) with the similar basic mechanical properties under normal temperature or 160℃lower. | Fang Kun Yang Jie Wu Sizhu Li Mei Ma Mingtu | 2012 | Engineering Sciences2012，10，6： | 3 |
| 8 | Development and application research of light weight heat treated B-grade bulletproof steel显示文摘The light weight heat treated B-grade bulletproof steel was developed through composition design and optimization based on multiplex alloying,multiplex micro-alloying design ideas and complex phase structure strengthening theory.The puzzle how to avoid the quenching deformation problem of super high strength thin sheet was solved through heat treatment in a die with a set of cooling system.Such B-grade bulletproof steel plate has fine tempered lath martensite structure.The shooting and certification test results showed that the shoot resistance of B-grade bulletproof steel plate can meet the protection demand of Protection specification for cash carrying vehicles(GA 164—2005).In comparison with B-grade bulletproof steel plate made by one of the companies in Sweden,the weight of the developed B-grade bulletproof steel plate can be decreased by 8 %under the same shoot resistance condition.It will be meaningful for cash truck and anti-hijacking vehicle to realize light weight,energy conservation and emission reduction. | Ma Mingtu Chen Gang Ma Yuhao Li Zhigang Feng Yi | 2014 | Engineering Sciences2014，12，5： | 2 |
| 9 | Study on the resistance spot welding technology of 22MnMoB hot stamping quenched steel显示文摘In this paper,the spot welding technology of a new kind of 22 MnMoB hot stamping quenched steel sheet was systematically studied by power frequency spot welder.Through a series of technology and test experiments,we have obtained the optimal spot welding technological parameter condition.According to the results,the relations among spot welding technological parameter,welding nugget,mechanical property and fracture mode were discussed.The effects of all the welding parameters such as welding current,welding time and electrode force on the quality of joint can be boiled down to one thing—the diameter of welding nugget.The experimental results showed that welding nugget diameter determines the mechanical property of spot welding joint and the relation between welding nugget diameter and the mechanical property of joint presents a kind of linear mathematic representation.There are two typical fracture models of 22 MnMoB hot stamping quenched steel sheet,i.e.,interfacial fracture and nugget pullout.Other than mild steel or normal high strength steel,in the shearing tensile test,hot stamping quenched steel has a great tendency to fail in interfacial mode due to the effects of high strength matrix structure,welding soft zone and the porosity level of fusion zone. | Feng Yi Ma Mingtu Hua Fu'an Zhang Junping Song Leifeng Jin Qingsheng | 2014 | Engineering Sciences2014，12，5： | 2 |
| 10 | Air cushion furnace technology for heat treatment of high quality aluminum alloy auto body sheet显示文摘The process characteristics of heat treatment of aluminum alloy auto body sheet and the working principle of air cushion furnace were introduced.The process position and irreplaceable role of air cushion furnace in the aluminum alloy auto body sheet production was pointed out after the difficulty and key points in the whole production process of auto body sheet were studied.Then the development process of air cushion furnace line of aluminum alloy sheet was reviewed,summarized and divided to two stages.Based on the research of air cushion furnace,the key technology of it was analyzed,then the key points on process,equipment and control models of air cushion furnace for aluminum alloy auto body sheet in future were put forward.With the rapid development of automotive industry,there will be certainly a new upsurge of research and application of air cushion furnace for heat treatment of aluminum alloy auto body sheet. | Li Yong Wang Zhaodong Ma Mingtu Wang Guodong Fu Tianliang Li Jiadong Liang Xiong | 2014 | Engineering Sciences2014，12，5： | 2 |
| 11 | The test device for heat friction coefficient of high strength steel显示文摘Using high strength steel and ultra-high strength steel in hot stamping and automobile parts is one of the most important ways of the automobile lightweight,which is the development trend of automobiles currently.In this paper, the development of test device for heat friction coefficient by high strength steel can provide important technical parameters for hot stamping process,making the right selection of equipment types,mold design,technology optimization,and research and development of lubrication medium of press forming.At the same time,the experiments indicate that the instrument has not only accurate test result but also good repeatability. | Sun Zhifu Ma Mingtu Ma Fangwu Guo Yihui Song Leifeng Yao Zaiqi | 2012 | Engineering Sciences2012，10，6： | 1 |
| 12 | Recycle-Friendly Aluminum Alloy Sheets for Automotive Applications Based on Hemming显示文摘Unavoidably,Fe impurities are mixed into Al alloys during recycling of aluminum automotive parts.High Fe content recyclefriendly aluminum alloy sheets(RASs)are discussed in terms of their applications to car body parts and closures.RASs have advantages,such as they are low cost and light weight,they require less energy to process,and they reduce emissions when used in vehicles.The hemming ability of RASs was investigated through various quenching rates and hot-rolling reduction rates.The hemming factor(HF)values of low Fe content samples(0.1 and 0.3 wt%Fe content)were 2 and 3.The hemming ability of samples with an Fe content of 0.5 wt%was unacceptable for applications to automotive outer closures(i.e.,HF values of 4 and 5).The HF values changed from 3 to 5 for even higher Fe content samples(0.8 wt%Fe),depending on the quenching and hot-rolling reduction rates.Lower quenching(air quenching)and lower hot-rolling reduction rates(6-pass hot rolling)both improved the hemming ability of the high Fe content samples.A low-cost and recycle-friendly aluminum alloy automotive sheet from end-of-life vehicles is presented,and its hemming properties are characterized. | Hongzhou Lu Junping Zhang Ni Tian Xinli Song Mingtu Ma Guimin Lu | 2018 | Automotive Innovation2018，1，1： | 1 |
| 13 | Numerical analysis on the shoot resistance of heat treated light weight B-grade bulletproof steel plates显示文摘Bulletproof steel plates are widely used for the safety of special vehicles.This paper mainly researches on the shoot resistance of heat treated light weight B-grade bulletproof steel plates through numerical analysis.Based on the flow behavior of bulletproof steel plates and bullet at various high strain rates,finite element(FE) model has been set up using ANSYS/LS-DYNA software.The simulation results are compared with the shooting results,which show a good consistency and a high reliability.Therefore,the simulation results are efficient approaches and strategies to decide and select the mechanical property and thickness of bulletproof steel plates,saving a lot of work and the cost of experiments. | Ma Mingtu Zhang Jingwen Zhang Junping | 2014 | Engineering Sciences2014，12，5： | 1 |
| 14 | State of the art of impact testers for spot welds显示文摘Impact testing is a primary method to evaluate the impact property of resistance spot welding,which is an important quality index in automotive industry.For testing impact properties of spot welds,many customized testers have been developed.This paper summarized some of the impact testers reported in open literatures and the emphasis was placed on the equipment structures,functions,technical parameters,advantages and disadvantage,etc.Some key issues about the development of the testers such as kinematic energy input mode,fixture design,combined load testing,sensor and data acquisition were discussed.Finally,the problems and prospects in the research and development of impact testers for spot welds were pointed out. | Hua Fu' an Ma Mingtu Li Jianping Wang Guodong | 2014 | Engineering Sciences2014，12，5： | 1 |
| 15 | Light weight replacement and the optimization design of bumper beam based on crash safety显示文摘Bumper beam is one of the key structural parts,which plays an important role in the frontal crashes of automobile.With the global trend of light-weighted automotive parts,the light weight of bumper beam attracts extensive attention of automobile manufacturers,and hot stamping technology with significant weight advantage has become one of the main light weight measures for bumper beam.The quasi-static press,low speed crash and frontal crash simulation models of bumper beam were established according to its actual working conditions in the automobile crashes.The feasibility of replacing normal steel bumper beam with hot stamping bumper beam was analyzed.Meanwhile,the stiffeners in the front face of hot stamping bumper beam were optimized with topography optimization in order to further improve its performances. | Zhang Jingwen | 2014 | Engineering Sciences2014，12，5： | 1 |
| 16 | Finite Element Analysis of Stamping of Automobile Beam显示文摘With the development of numerical simulation and analysis technology, plastic forming theory, stamping technology and computer technology, DynaForm technology with a finite element as the core has been developed rapidly. DynaForm technology for sheet metal stamping can simulate the entire process of sheet metal stamping. In this paper, the metal beam is used as the research object, and the fi nite element analysis is carried out by DynaForm software. The causes and control methods of the typical defects in the forming process are analyzed. The radius, punching speed, Coeffi cient, blank holder force, drawbead and other parameters on the quality of the impact of automotive beams. Combined with the actual production of a reasonable forming process and improve the way. The simulation used to guide the practice, can shorten the mold development time, reduce the cost of molds, improve business income;the production practice has a certain guiding signifi cance. | Xiaoli Fu Yuedong Qiu Mingtu Zhao | 2018 | Computer Simulation in Application2018，1，1： | 1 |
| 17 | On the lightweighting of automobile显示文摘 | Ma Mingtu Yi Hongliang Lu Hongzhou | 2009 | Engineering Sciences2009，11，9： | 1 |
| 18 | The automotive lightweight and the appli- cation of aluminum alloy显示文摘 | Ma Mingtu Ma Luxia | 2008 | New Material Industry2008，，9： | 1 |
| 19 | On the light-weighting of automobile显示文摘 | Ma Mingtu Yi Hongliang Lu Hongzhou | | 0，，09： | 1 |
| 20 | On the automotive Lightweight显示文摘 | Ma Mingtu Yi Hongliang Lu Hongzhou | | 0，，02： | 1 |
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