检索结果-内蒙古大学图书馆

PLASTICS RUBBER AND COMPOSITES processING AND APPLICATIONS 1995年第1期23卷 43-52页

作者： ISMAIL, H FREAKLEY, PK BRADLEY, RH SUTHERLAND, I SHENG, E Rubber Process Engineering Center (RUPEC) Institute of Polymer Technology and Material Engineering Loughborough University of Technology Loughborough Leicestershire LEI 1 3TU UK

The modes of action of a diamine salt of fatty acid with a general structure of RNH2+(CH2)3NH3+(R'COO-)2, referred to as a multifunctional additive (MFA) in carbon black filled natural rubber compound have been studied. The addition of MFA to a natural rubber compound with 50 phr of N330 carbon black is shown to increase certain physical properties up to a level of 2 phr (identified at the critical amount to coat the carbon black with a monolayer of MFA) after which there is a gradual deterioration of properties. The MFA exerts its greatest effect at the elastomer-carbon black interface as gum compounds show minimal changes in physical properties with MFA concentration. Swelling test results show very little change in the solvent uptake with increasing MFA, indicating the effect on crosslink density is small. In contrast, carbon black dispersion, measured by computer-aided image analysis and scanning electron microscopy (SEM) showed a substantial improvement with increasing MFA concentration. Bound rubber was found to decrease with the addition of MFA and a limiting bound rubber value was obtained at the MFA loading which corresponds to a monolayer coverage of the carbon black. This is attributed to a reduction of the amount of rubber immobilised in carbon black agglomerates due to the improved carbon black dispersion.

关键词： Rubber

来源：评论

学校读者我要写书评

暂无评论

MAKING PIPING SYSTEMS FIRE-SAFE - SIMPLE SOLUTIONS FOR PREVENTING A DISASTER

引用

NAVAL ENGINEERS JOURNAL 1994年第3期106卷 285-295页

作者： BHASIN, V NILSEN, L GUPTA, K CONROY, D Vinod Bhasin P.E.:is a fellow engineer with the Westinghouse Electric Corporation machinery technology division Pittsburgh Pa. He has more than 19 years of experience in the supervision design application and testing of valves and actuators and has taught courses in solids mechanics for 10 years at Illinois Institute of Technology Chicago Il. Mr. Bhasin has written articles for the valve industry where he has been active in standards societies. He holds BS and MS degrees in mechanical engineering and an MS in industrial engineering. Mr. Bhasin is a member of the American Society of Mechanical Engineers (ASME) and the American Society for Testing and Materials (ASTM). He is co-chairman of the shipbuilding piping component subcommittee ASTM F25.13 and is also chairing three other task groups under ASTM F25. Lloyd Nilsen P.E.:is the piping components branch head for NavSea. His career with NavSea includes 33 years of ship design construction and repair experience. He has held various positions in the power piping design division human factors manning and controls integration branch and submarine machinery systems branch. He has a BS degree in marine engineering from N.Y. State Maritime. Mr. Nilsen is also a member of the NavSea Association of Scientists and Engineers and a registered licensed professional engineer in Virginia and Washington D.C. Karan Gupta P.E.:is a senior engineer with the Westinghouse Electric Corporation Machinery Technology Division Pittsburgh Pa. Prior to joining Westinghouse he was employed by Elliott Company Jeannette Pa. for 12 years as a metallurgical engineer. He has more than 25 years experience in metallurgical engineering including material selection and brazing and welding of piping pressure vessels and turbines. Mr. Gupta has BS and MS degrees in metallurgical engineering. He is a member of the American Welding Society (AWS) and is active in AWS filler metal subcommittee A5A. He is also a member of ASM International. Dennis Conroy: is a chemical engineer

Loss of life and property losses totaling tens of billions of dollars have piping engineers scrambling to specify ''fire-safe'' components in fire-prone locations: on board ships, and in power plants, refineries, and other perilous applications. Fire-safe valves, the first line of defense in containing a fire, were introduced some 25 years ago, with fire-safe actuators following soon afterwards. Little attention has been given, however, to designing and selecting the other piping components such as flanges, gaskets, bolting, and fittings to ensure their integrity in a fire. Just like in an electric circuit where, if a single component in series fails, the flow of electricity stops;likewise, the failure of a single piping component could result in a fire of catastrophic proportions. This paper discusses the availability of critical fire-safe components for Navy shipboard piping systems and provides some simple solutions which, if implemented, could prevent such a disaster. Discussion is provided on how a fire starts and how it reaches catastrophic proportions, the definitions of survivability and fire-safe components, materials of construction, component design, fire-safe valves and actuators, gaskets, pipe flanges, flange bolting, pipe fittings and unions, brazing and welding, insulation, composite piping materials, and other related subjects. Details are also provided on 78 fires that have occurred on Navy surface ships in the last ten years and their causes.

关键词：

来源：评论

学校读者我要写书评

暂无评论

An optimised equilibrium phase diagram and solution thermodynamics of arsenic-lead alloys

引用

Thermochimica Acta 1993年第C期216卷 1-14页

作者： Rannikko, Harri Sundström, Salla Taskinen, Pekka Helsinki University of Technology Faculty of Process Engineering and Material Science Laboratory of Materials Processing and Powder Metallurgy SF-02150 EspooFinland

The thermodynamic properties of solid and liquid arsenic-lead alloys have been critically analysed using the available literature sources. The excess Gibbs energies for the alloy phases were modelled by Redlich-Kister polynomials and the simultaneous least-squares analysis of the experimental data was carried out by using the lukas program. The following integral excess Gibbs energy functions were estimated for the liquid alloy and the lead fee solid solution (J mol^-1) {A figure is presented} The eutectic point was calculated as being at ^eT = 565.64K with ^fccx_As = 0.00150, ^ex_as = 0.0664 and ^rhox_As = 1.0000. The limiting activity coefficients of the components at infinite dilution in liquid lead and arsenic, respectively, calculated from the optimised model parameters were {A figure is presented}. © 1993.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Analytical calculation and direct measurement of stress in an aluminum interconnect of very large scale integration

引用

AIP Conference Proceedings 1992年第1期263卷 44-56页

作者： H. Yagi H. Niwa T. Hosoda M. Inoue H. Tsuchikawa Masaharu Kato Process Development Division Fujitsu Limited 1015 Kamikodanaka Nakahara‐ku Kawasaki 211 Japan Department of Material Science and Engineering Tokyo Institute of Technology 4259 Nagatsuda Midori‐ku Yokohama 227 Japan

The stress distribution in an aluminum interconnect for VLSI was calculated analytically by applying Eshelby’s method in micromechanics. The stresses were obtained as a function of the aspect ratio (r=thickness/width) of the Al line cross section. The yielding criteria in plasticity were applied to determine whether the calculated stresses can induce relaxation due to plastic deformation. The stress after plastic deformation were maximum at r=1. Direct X‐ray stress measurements for Al lines with various aspect ratios were carried out to verify our analytical model. The aspect ratios were varied by changing the line width while maintaining the line thickness constant, and vice versa. In either case, no maximum was found at r=1, in contrast with the results of the analytical calculation. This disagreement was attributed to the fact that the yield stress of Al line was assumed to be independent of the aspect ratio in our calculation. Using a diffusional growth model of grain boundary voids, the time to failure of the Al line was estimated analytically. Life tests of Al interconnects were carried out to examine the model with respect to life test temperatures, the Al line aspect ratios, and passivation structures. Most of the experimental results were in good agreement with the predictions of the model, except for the lifetime differences for different passivation materials. It was suggested that mechanical properties of the passivation films affect the void nucleation density.

关键词：

来源：评论

学校读者我要写书评

暂无评论

FLAMMABILITY AND TOXICITY OF COMPOSITE-materialS FOR MARINE VEHICLES

引用

NAVAL ENGINEERS JOURNAL 1990年第5期102卷 45-54页

作者： SEVART, JL GRIFFIN, OH GURDAL, Z WARNER, GA Jeffrey L. Sevart:is a native of Kansas and a 1985 graduate of Kansas State University with a B.S. in mechanical engineering (magna cum laude). After working as a stress analysis engineer at Boeing Military Airplane Company in Wichita Kans. he attended Virginia Polytechnic Institute and State University and received an M.S. in engineering mechanics in February 1988. He currently resides in Akron Ohio working as a research engineer in tire composites research at The Goodyear Tire and Rubber Company. O. Hayden Griffin Jr.:received his B.S. and M.S. in mechanical engineering from Texas Tech University in 1970 and 1971 respectively. He received his Ph.D. in engineering mechanics from Virginia Polytechnic Institute and State University in 1980. Prior to joining the faculty of Virginia Polytechnic Institute and State University as associate professor of engineering science and mechanics in September 1985 he was employed at the U.S. Naval Surface Warfare Center (Dahlgren Virginia) BF Goodrich Tire Group (Akron Ohio) the Bendix Advanced Technology Center (Columbia Maryland) and the Johns Hopkins University Applied Physics Laboratory (Laurel Maryland). He is currently an associate director of the Virginia Institute for Material Systems. He is a registered professional engineer in Virginia and is a member of the American Society of Mechanical Engineers and the American Society for Composites. Zafer Gürdal:received his M.S. in mechanical and aerospace engineering from Illinois Institute of Technology in 1981 and his Ph.D. in aerospace engineering from Virginia Polytechnic Institute and State University in 1985. He worked as a research associate in the Aerospace and Ocean Engineering Department at Virginia Tech before joining the Engineering Science and Mechanics Department as an assistant professor in September 1985. Professor Gürdal's research interests include: composite structures failure mechanics of composites structural optimization and damage tolerant design. He is a member of the American Institute

Characteristics of both thermoplastic and thermoset composite materials as they pertain to marine vehicle applications are discussed. Comparison of various material selection factors such as strength, damage and moisture resistance, and flammability and toxicity as well as cost and availability of thermoset and thermoplastic composite materials are presented. Methods for testing and reducing the flammability and toxicity are discussed. Many commercially available composite systems are reported to provide favorable characteristics for marine applications. Although there seems to be a need for improved production technology for thermoplastics, they present potential advantages in physical properties over thermoset composites.

关键词： Composite materials

来源：评论

学校读者我要写书评

暂无评论

THE NO FRAME CONCEPT - ITS IMPACT ON SHIPYARD COST

引用

NAVAL ENGINEERS JOURNAL 1984年第3期96卷 218-232页

作者： NAPPI, NS WALZ, RW WIERNICKI, CJ Natale S. Nappi:graduated from City College of New York in 1954 with a B.S. degree in civil engineering and received his M.S. in civil engineering from the Polytechnic Institute of Brooklyn in 1959. He began his professional career in 1954 at the New York Naval Shipyard as a naval architect (structures) performing detail structural design and fabrication studies for CVAs LPDs DDs and CGs and eventually became a supervisory naval architect (structures). From 1965 to 1973 he was a member of the staff of the Computer-Aided Design Division at the David Taylor Naval Ship Research and Development Center (DTNSRDC). As such he was involved in the development of the computer structural design tool the SSDP (in association with Frank M. Lev) and automated detail design programs (CASDOS). His current position is Senior Naval Architect Consultant in the structural integrity group of the Ship Structures Division Structures Department DTNSRDC. Mr. Nappi is the author and co-author of numerous technical papers and reports covering a wide spectrum of topics such as automated structural design process design for producibility and survivability material weight and cost trade-off studies and structural weight determination for high performance ships (i.e. SES SWATH HYSWAS). He has lectured on the subjects of design for survivability and ship structures at the Naval Post Graduate School and MIT. He is a member of ASNE ASCE U.S. Naval Institute Sigma Xi and is a registered Professional Engineer in the State of New York. Mr. Nappi was a member of the NAVSEA working commitee for the computer supported design planning effort and is currently a member of the DTNSRDC ASSET Advisory Committee. Ronald W. Walz:graduated in 1974 from Pennsylvania State University with a B.S. degree in civil engineering. He began his professional career in 1974 at the David Taylor Naval Ship Research and Development Center as a structural engineer in the structural design concepts group of the Ship Structures Division Structures Department.

A proposed cost effective alternative to current U.S. Navy structurally configured hulls is presented in this paper. This proposed design for producibility concept involves the elimination of structural stanchions and transverse web frames. The potential impact of this “no frame” concept on structural design, weight and construction and material costs for naval surface frigates and destroyers is reflected in 1) reduced costs for the installation of distributive systems and 2) a reduced number and complexity of structural details providing a more reliable and less costly structure. This study was performed in three parts: 1) Determine the most feasible length between bulkheads without frames; 2) Using this length perform detail weight studies and construction and material costs analysis comparison on a 72-foot long hull module, with and without frames, for a FFG-7, and 3) Estimate the saving in man hours of labor on the installation of distributive systems and shipfitting for an FFG-7. For the feasible length studies on the “no frame” structural configuration, thirty-seven strength, weight and vertical center of gravity studies were performed on two ship classes; twenty-two on the FFG-7 class and fifteen on the DD-963 class. The detailed weight studies and construction and material cost analyses were conducted for FFG-7 “no frame” and “as built” modules. Results indicating the “no frame” concept module was 6.8% heavier and 14.8% less costly than the “as built” module. For the impact of an FFG-7 “no frame” structurally configured hull on the cost of labor required for the installation of distributive systems and for other functional work such as ship fitting, welding, and electrical, this study indicated a reduction of 169,206 labor hours per ship, representing 7.12% of the total required man hours to fabricate an FFG-7 class ship. With the employment of the “no frame” concept, certain areas of significant concern and potential risk were addressed. These include: 1) t

关键词：

来源：评论

学校读者我要写书评

暂无评论

THE STRUCTURAL SYNTHESIS DESIGN PROGRAM - ITS IMPACT ON THE FLEET

引用

NAVAL ENGINEERS JOURNAL 1983年第3期95卷 87-99页

作者： WIERNICKI, CJ GOODING, TG NAPPI, NS Mr. Christopher J. Wiernicki:graduated from Vanderbilt University in 1980 with a B.E. degree in Structural Engineering. Upon graduation he began his professional career at the David Taylor Naval Ship Research and Development Center. As a structural engineer in the Surface Ship Structures Division Mr. Wiernicki was responsible for developing improved methods and procedures for designing and evaluating structural systems for surf ace combatants. Specific projects included design for producibility development and evaluation of automated ship structural design methods and participation in the structural design of the CG 49 Cruiser and the current DDG 51 Destroyer. In 1982 Mr. Wiernicki received his M.S. degree in Ocean Engineering from George Washington University. Mr. Wiernicki is a recipient of the SNAME 1982-82 Graduate Scholarship and is currently doing post graduate work in Naval Architecture at Massachusetts Institute of Technology he is a member of ASNE SNAME ASCE and Chi Epsilon. Mr. Thomas G. Gooding:graduated in 1975 from the University of Michigan with B.S. degrees in Oceanography and Naval Architecture. After graduation he began his professional career at the Naval Ship Engineering Center (NA VSEC) as a structural engineer. From 1975 till 1978 Mr. Gooding worked in the area of ship dry docking and was the structural task leader on the complex overhaul ofUSS Long Beach (CGN-9). Mr. Gooding returned to the University of Michigan to receive a M.S. in Naval Architecture in 1979. Currently Mr. Gooding is the structural task leader on the DDGX/DDG 51 program at the Naval Sea Systems Command (NAVSEA). Mr. Gooding is a member of SNAME and the Naval Institute. Mr. Natale S. Nappi:graduated from City College of New York in 1954 with a Bachelor of Civil Engineering and received his M.S. in Civil Engineering from Polytechnic Institute of Brooklyn in 1959. He began his professional career in 1964 at the New York Naval Shipyard as a Naval Architect (Structure) performing detail structural design and fabrication s

The structural design of a ship's section is a complicated, repetitive and time consuming task. With the advent of new technology, high speed computers have enabled the ship designer to accomplish in a matter of seconds what would formerly take days to accomplish by hand. The Structural Synthesis Design Program (SSDP) is a N avy developed computer-aided design tool which is used to design (or to analyze) the longitudinal scantlings for a variety of ship cross sections, consisting of any practical combinations of decks, platforms, bulkheads and materials, i.e., various steel and aluminum alloys. The final hull section design will have the lowest practical weight for the chosen geometric configuration, structural arrangements, and imposed loadings. The scantling developed by the program will satisfy all U.S. N avy ship structural design criteria. An explanation of the objective and design elements of N avy ship structures is included. The rationale behind the SSDP design philosophy is developed along with the significant program capabilities. In an attempt to highlight the influence of automated design procedures on the current naval ship design process, the effect of the SSDP on the DDG 51 destroyer structural development is addressed.

关键词：

来源：评论

学校读者我要写书评

暂无评论

DISPERSION OF ULTRASONIC DATA AS A MEASURE OF HYGROTHERMAL EFFECTS ON FIBER-REINFORCED PLASTIC LAMINATES

引用

COMPOSITES 1980年第4期11卷 205-208页

作者： ISHAI, O BARCOHEN, Y Faculty of Mechanical Engineering Technion-Israel Institute of Technology Haifa Israel Material and Process Engineering Israel Aircraft Industries Ben Gurion Airport Israel

Destructive and non-destructive tests were carried out on three-fibre-reinforced plastic composites-glass, carbon and Kevlar reinforced epoxy-under hygrothermal exposure. In all cases good correlation was found between the dispersion of ultrasonic attenuation data (measured by its coefficient of variation) and corresponding average values of strength and attenuation. Accordingly, dispersion may serve as a reliable parameter in non-destructive evaluation for detection and follow-up of hygrothermal degradation in fibre-reinforced laminates.

关键词： Plastics, Reinforced

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：