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| 1 | Study on Theory and Application of the Energy Method used for Analyzing Compressive Instability in Sheet Forming显示文摘It is pointed out that there was serious weakness w he n using the energy method for studying compressive plastic instability in sheet forming in the past. Where applying the deduced instability strengths to relativ e engineering analysis, theoretical solutions were away from practices. Its basi c reason is that simplified process in mathematical analysis of elastic bending energy was completely applied to that of plastic bending energy. Where the cambe r expressed by function of displacement normal to a plate was approximated to re alistic deflective camber, the displacement of deflected plate to compressed dir ection was neglected. With the aid of the improved instability strengths, the pr edictions on both critical buckling dimension of blank in cup deep-drawing with out blankholder through cylindrical die or conical die and the minimum blankhold er pressure to prevent buckling under constant load are universally in agreement with both experimental results and experiential data. On the bases of above-mentioned improvement, the approximate expressions for bo th the curvature and the twist used in equation of the energy of elastic bending are also ameliorated. Thus the obtained general equations for both the energy a nd the work done by internal force in plastic bending of a plate are more precis e than before. In the analyses of plastic buckling of shell with bending moment, the effect of bending moment is considered through the work done by simulative bending for ce. The method proposed in this paper can not only simplify analyses but also ge t practical result. | XIONG Zhi-qing 1, XIE Lan-sheng 2 (1. Department of Mechanical Engineering, Nanjing Institute of Techno logy, Nanjing 210013, China 2. College of Mechanical and Electrical Engineering, Nanjing University of Aer onautics and Astronautics, Nanjing 210016, China) | 2002 | 厦门大学学报(自然科学版)2002，41，S1： | 3 |
| 2 | Research on the Characters of the Cutting Force in Vibration Cutting Particle Reinforced Metal Matrix Composites SiC_p/Al显示文摘In this paper, turning experiments of machining particle reinforced metal matri x composites(PRMMCs) SiC p/Al with PCD tools have been carried out. The cutting force characteristics in ultrasonic vibration turning compared with that in com mon turning were studied. Through the single factor experiments and multiple fac tor orthogonal experiments, the influences of three kinds of cutting conditions such as cutting velocity, amount of feed and cutting depth on cutting force were analyzed in detail. Meanwhile, according to the experimental data, the empirica l formula of main cutting force in ultrasonic vibration turning was conclude d. According to the test results, the cutting force is direct proportion to cutt ing depth basically according to the relation between cutting force and other fa ctors, which is similar to that of common cutting, so is the feed rate, but the influence is not so big. The influence of cutting speed is larger than that of f eed rate on cutting force because the efficient cutting time increases in vibrat ion cycle with the increase of cutting speed, which causes cutting force to incr ease. The research results indicate: (1) Ultrasonic vibration turning possesses much lower main cutting force than that in common turning when adopting smaller cutting parameters. If using larger cutting parameters, the difference will inco nspicuous. (2) There are remarkable differences of cutting force-cutting veloci ty characteristics in ultrasonic vibration turning from that in common turning m ainly because built-up edge does not emerge in ultrasonic turning unlike common turning in corresponding velocity range. (3) In ultrasonic vibration cutting, t he influence of cutting velocity on cutting force is most obvious among thre e cutting parameters and the influence of feed is smallest. So adopting lower cu tting velocity and larger cutting depth not only can reduce cutting force effect ively but also can ensure cutting efficiency. (4) The conclusions are useful in precision and super precision manufacturing thin-wall pieces. | LIU Chuan-shao 1, ZHAO Bo 1,2, GAO Guo-fu 1, JIAO F eng 1 (1. Department of Mechanical Engineering, Jiaozuo Institute of Techno logy, Henan 454000, China 2. Institute of Mechanical Engineering, Shanghai Jiaotong University, Shanghai 200030, China) | 2002 | 厦门大学学报(自然科学版)2002，41，S1： | 3 |
| 3 | Experimental Study on Hard Turning Hardened GCr15 Steel with PCBN Tool显示文摘This paper discusses experimental results of turnin g experiments on GCr15 bearing steel hardened to 60~64 HRC. The objective was to d etermine the effect of the cutting parameters on cutting force, chip morphology and resultant workpiece surface quality, more specifically surface texture, micr ostructure alterations, changes in microhardness and residual stresses distribut ion. The changing rules of the main cutting force was shown in this paper which feature a increasing tendency with the improvement of the workpiece hardness wit hin the cutting parameter scope. The rule of cutting force changing with the wor kpiece hardness is accord to the traditional metal cutting theory. Stress value decrease with increasing cutting speed and workpiece hardness. The comparison of the machined surface roughness and harden layer depth of machined surface for d ifferent hardness is shown in Fig.1. The machined surface roughness is the worst when the workpiece hardness is around 50HRC. When the workpiece hardness is ove r 50HRC, the surface roughness value shows a descending tendency with the additi on hardness. The machined superficial harden layer depth shows an increasing ten dency with the improvement of the workpiece hardness. When the workpiece hardnes s is 50HRC the machined superficial harden layer depth is tiptop. When the workp iece hardness is over 50HRC the depth changes little with the addition of workpi ece hardness. The remnant stress status of the machined surface is shown in Fig. 2, which is press stress status both in surface and in base for less cutting par ameters under two kinds of cutting condition. But experiment results show that t ensile stress can be produced under uncomfortable cutting conditions. The deform ation created by the chip formation is reduced whereduce with [TPP126A,+35mm77mm,Z,PY#]Depth from surface (μm) ■ v=200m/min,f=0.24mm/r,ap=0.8mm,60HRC ● v=200m/min,f=0.15mm/r,ap=0.5mm,60HRC Fig.1 The subsurface residual stress between the two experimentsHardness (HRC) Fig.2 The surface finish vs. workpiece hardness the workpiece hardness is improved. | LIU Xian-li 1, WEN Dong-hui 2, LI Zhen-jia 1, XIAO Lu 1, YAN Fu-gang 1 (1. Dept. of Mechanical Engineering, Harbin University of Science and Technology, Harbin 150080, China 2. Dept. of Precision Instrunments & Mechano logy, Tsinghua University, Beijing 100084, China) | 2002 | 厦门大学学报(自然科学版)2002，41，S1： | 2 |
| 4 | High expression of cyclin E and G1 CDK and loss of function of p57KIP2 are involved in proliferation of malignant sporadic adrenocortical tumors显示文摘 | Bourcigaux N Gaston V Logie A | 2000 | J Clin Endocrinol Metab2000，85，： | 1 |
| 5 | Meta-analysis of health and de-mographic correlates of stigma towards people livingwith HIV显示文摘 | Logie C Gadalla T M | 2009 | AIDS Care2009，21，6： | 1 |
| 6 | Concurrent performance of two memory tasks: Evidence for domain-specific working memory systems显示文摘 | Robert H Logie Sergio Della Sala etc | 2002 | Memory & Cognition2002，30，7： | 1 |
| 7 | The prognostic value of e-voked re- sponses from primary somatic sensory and auditorycorte in coma lose patients显示文摘 | Logi F Fischer C murri L | 2003 | Clin Neurophysiol2003，11，16： | 1 |
| 8 | A multi-agent architecture for cooperative inter-jurisdictional traffic congestion management显示文摘 | LOGI F RITCHIE S G | 2002 | Transportation Research Part C: Emerging Technologies2002，10，5： | 1 |
| 9 | Gender andethnicity differences in HIV-related stigma experiencedby people living with HIV in Ontario, Canada显示文摘 | Loutfy M R Logie C H Zhang Y | 2012 | PLoSOne2012，7，48： | 1 |
| 10 | A Critical Appraisalof the Use of Standardized Client Simulations in Social WorkEducation 显示文摘 | LOGIE C BOGO M REGEHRC | 2013 | Journal of Social Work Education2013，49，1： | 1 |
| 11 | Surface electronic structure and isomerization reactions of alkanes on some transition metal oxides显示文摘 | KATRIB A LOGIE V PETER M | 1997 | Surf Sci1997，，： | 1 |
| 12 | Surface electronic structure and isomerization reactions of alkanes on some transition metal oxides显示文摘 | Katrib A Logie V Peter M | 1997 | Surf Sci1997，，20： | 1 |
| 13 | Low and high imagers activate networks differentially in mental rotation显示文摘 | Logie R Pernet C Buonocore A | | 0，，11： | 1 |
| 14 | Increased levels of insulin-like growth factor Ⅱ (IGF-Ⅱ)and IGF-binding protein-2 are associated with malignaney in sporadic adrenoeortical tumors 显示文摘 | Boulle N Logie A Gicquel C | 1998 | J Clin Endocrinol Metab1998，83，： | 1 |
| 15 | Kinetics of the oxida- tion of carbon black by NO2 influence of the presence of water and oxygen 显示文摘 | Jacquot F Logie V Brilhac F | 2002 | Carbon2002，40，： | 1 |
| 16 | Visuo-spatial working memory: Visual, spatial or central executive? Mental images in human cognition显示文摘 | Logie R H Marchetti C | 1991 | Advances in psychology1991，80，： | 1 |
| 17 | Visuospatial working memory, movement control and executive demandsSalway显示文摘 | Logie Robert H | 1995 | British Journal of Psychology1995，，86： | 1 |
| 18 | Development and evaluation of a knowledge-based system for traffic congestion management and control显示文摘 | LOGI F RITCHIE S G | 2001 | Transportation Research Part C2001，9，6： | 1 |
| 19 | Low and high imagers activate networks differentially in mental rotation 显示文摘 | Logie RH Pernet CR Buonocore A | 2011 | Neuropsy- chologia2011，49，11： | 1 |
| 20 | Surface electronic structure and isomerization reaction of alkanes on some transition metal oxides显示文摘 | A Katrib V Logie N Saurel | 1997 | Surface Science1997，，： | 1 |
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