Mechanical Engineering Materials Research Articles

Project-Based Manufacturing Engineering Practice at Ibaraki University and Its Outcomes

The real world experience of manufacturing processes from an idea stage to a final product must be related to classroom lectures in mechanical engineering curriculum, including design, materials engineering, dynamics and control. Various challenges and difficulties encountered during the manufacturing engineering practice also let students recognize their creativity as well as what kinds of knowledge is missing. Awareness is the start of growth. In line with this principle we have carried out the mechanical engineering practice for 10 years. Some modifications toward “project-based practice” , however, have been made through manufacturing engineers’ real activities. Drawing and specification, process control, cost management, and role-sharing arrangement are stressed during the semester course. The present paper describes how it works and what is left to improve further, such as a refinement of themes and a coaching method for bringing out the hidden talent in students.

Electronic structure of grain boundaries in the Fe86-Mn12.7-C1.3alloy

The importance of studying Fe-Mn-C alloys is related to their wide use as constructional materials in mechanical engineering. In this work an effort has been made to elucidate the physical origin of the magnetization in austenitic steels by calculating the electronic structure of grain boundaries. To theoretically investigate the magnetic properties of a crystal of ferromagnetic bcc iron, the wave functions of the iron atom calculated in view of the spin polarization of a core by the Hartree-Fock method with local exchange-correlation potentials have been used as base functions. This has made it possible to optimize the choice of a zero approximation for the description of the electronic states of ferromagnetic iron and to attain good agreement with the experimental values of the magnetic moment (μ theor = 2.23μ B , μ exp = 2.218μ B ), of the exchange splitting of the crystal term P 4 (Δ theor = Δ exp = 0.112 Ry), and of the cross-sections of the Fermi surface. A similar approach has been used to investigate the magnetic states of clusters (nanoclusters) based on the method of scattered waves. The approach developed for clusters of the alloy under investigation makes it possible to calculate the alloy magnetic properties in relation to the cluster size for a varied lattice parameter.

Carbides of transition metals in abrasive machining (Review)

This paper reviews works on the use of transition-metal carbides and presents results of the author’s own research on the abrasive machining of mechanical engineering materials. It is established that the properties of abrasive grains are primarily controlled by the abrasive nature and production process. It is shown that carbides of transition metals are efficient for use in abrasive tools (grinding disks, pastes for processing mechanical engineering parts from various materials).

機械と電気の融合から : モータ・アクチュエータ用磁性材料(<メカライフ特集>創立110周年記念 活躍する材料-未来を拓く材料技術の最前線-)

機械と電気の融合から : モータ・アクチュエータ用磁性材料(<メカライフ特集>創立110周年記念 活躍する材料-未来を拓く材料技術の最前線-)

Present status of optimizing selection of mechanical engineering materials

Through listing the specific engineering application examples of modern materials selection methods, the elements of selecting engineering materials are summarized on the base of summarizing the new research progress of materials selec-tion area. The different methods and features of materials selec-tion are synthesized evaluated and optimized. It is demonstrated that the materials selection method according to fail resisting force indexes of structural members has important use value. It modifies the traditional customs of selecting engineering mate-rials and makes selecting materials more and more scientific and quantitative. It is discussed that the action and efficiency of materials database and expert consulting system in materials selecting area. It can help users quickly and generally search the information of materials.

Probing into methods for studying stress corrosion cracking of mechanical engineering materials

Probing into methods for studying stress corrosion cracking of mechanical engineering materials

Development problems of materials in mechanical engineering

This paper reviews the directions and conditions of development of the structural materials used in modern mechanical engineering. It points out theoretical and technological bases and methods of production of a new generation advanced materials of so far unattainable properties. Special attention is paid to the ways and possibilities of optimization of the chemical composition, technology, structure and properties of materials now in use. Examples of research and the development of structural materials in Polish science center are given.

New trends in the development of mechanical engineering materials

New or improved materials are presently evolving faster than at any other time and the huge number of already existing materials is growing rapidly. Moreover, the improvement of the characteristics of materials with time is nearly exponential. Engineers cannot ignore this tendency, because the materials used today will be supplanted by new materials in a very few years time. The joint stimulation of market pressure and science pressure is generating the development of new classes of materials (e.g. new composites, nanostructured materials, functionally gradient materials) and of new synthesis or processing procedures (e.g. rapid solidification of alloys, mechanical alloying, hot isostatic pressing).

Superhard materials in mechanical engineering

The main trends in scientific studies on the production of superhard materials have been identified and defined. Amongst these are the development of new and highly efficient synthesis methods, the production of automatic equipment for synthesizing diamonds and cubic boron nitride, an extension to the materials range and improvements to their physicomechanical properties. The results obtained enable urgent technological problems in mechanical engineering to be solved. In particular, 3 mm single crystal synthetic diamonds can be produced for superprecision machining, as a substitute for poor efficiency grinding, and manual finishing using superhard materials as the tool blade, machining of new high strength and heat resistant ceramic materials, numerically controlled computer equipment, automatic lines and machine shops with highly efficient and accurate abrasive and blade tools. Some materials used in modern mechanical engineering are described, and the results of studies in the field of superhard material tool manufacture are presented. The importance of tribological methods for improving the reliability, durability and efficiency of machines and mechanisms is emphasized.

Burgers circuit perspectives

physica status solidi (a)Volume 105, Issue 1 p. K25-K27 Short Note Burgers circuit perspectives M. J. Marcinkowski, M. J. Marcinkowski Department of Mechanical Engineering and Engineering Materials Group, University of Maryland, College Park Search for more papers by this author M. J. Marcinkowski, M. J. Marcinkowski Department of Mechanical Engineering and Engineering Materials Group, University of Maryland, College Park Search for more papers by this author First published: 16 January 1988 https://doi.org/10.1002/pssa.2211050140Citations: 1 College Park, Maryland 20742, USA. AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinkedInRedditWechat Citing Literature Volume105, Issue116 January 1988Pages K25-K27 RelatedInformation

機械工学と無機材料(非金属材料)

機械工学と無機材料(<特集>非金属材料)

機械工業材料を原子のレベルで考える

機械工業材料を原子のレベルで考える