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| 1 | 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 |
| 2 | 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 |
| 3 | 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 |
| 4 | 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 |
| 5 | 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 |
| 6 | Study of engaged performance regulation in controlled transfer clutch of 4WD car based on genetic sliding mode control显示文摘This paper investigates an approach to improve the engagement quality of controlled transfer clutch mode in 4 wheel drive(WD) car from three considerations of reducing friction,smoothening responsiveness and alleviating jerk.The method utilizes an improved sliding mode control with genetic algorithm instead of simplified mode to determine appropriate values of parameters in control close- loop.The simulation results show that the method is effective for improving the engagement quality of coupling satisfying different design needs for 4WD car,as well as robustness even if input torque is changed at a certain range. | Zhang Yang Men Yongxin Li Wei Ma Mingtu | 2014 | Engineering Sciences2014，12，5： | 0 |
| 7 | FFT-DMAC: a tone based DMAC protocol显示文摘This paper presents the flip-flop tone(FFT)DMAC protocol,a tone based MAC protocol using di-rectional antennas to solve the deafness problem,hidden terminal and exposed terminal problems simulta-neously.It uses two pairs of flip-flop tones .The first pair of tone is to send omni-directionally to reachevery neighboring node to announce the start and the end of communication,and therefore to alleviate thedeafness problem.The second pair of tone is to send directionally towards the sender.It is used to solvethe hidden terminal problem as well as the exposed terminal problem.Evaluation shows that FFT-DMACcan achieve better performance compared to the 802 .11 and ToneDMAC protocol. | 李蓥 Li Mingtu Shu Wei Wu Minyou | 2009 | High Technology Letters2009，15，3： | 0 |
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