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Journal Article
Ala Qattawi, Mahmoud Abdelhamid, Ahmad Mayyas, Mohammed Omar
1 The manufacturing of Origami based sheet metal products is a promising technology, mostly in terms of reducing the tooling and process complexity. This procedure can also be called fold forming, as it depends on exclusively shaping the required geometry via sequence of bends. However, the design analysis and modeling of folded sheet metal products are not fully mature, especially in terms of determining the best approach for transferring the analysis from a three-dimensional (3D) to a two-dimensional (2D) context. This manuscript discusses the extension of the Origami technique to the fold forming of sheet metal products represented in modeling approach and design considerations for the topological variations, the geometrical validity, and the variance of stress-based performance. This paper also details the optimization metrics that were developed to reflect the design and manufacturing differences among the possible topological and geometrical options for a single part design.
Technical Paper
Swapnil Pawar, Sandip Patil, Suhas Joshi, Rajkumar Singh
Abstract Tapping is an important process in assembly of aircraft structures because on an average one millions of tapped holes are made on an aircraft structure. However, sudden breakage of the tap is the most undesirable event frequently encountered during the tapping process. In particular, this can mostly occur when small diameter internal threads are made in a ‘difficult-to-cut’ material like titanium. For this reason, it has been a topic of industrial interest in the manufacturing sector for many years. The ultrasonic vibrations assisted tapping (UVAT) is a novel manufacturing technology, where ultrasonic vibrations are provided to the work piece in the axial direction. The present work is a comprehensive study involving experimental characterization. The experimentation shows that UVAT reduces the torque during tapping as compared to that of in conventional process. There is a 19.1% reduction in torque and about 20.3% reduction in cutting temperature in UVAT over that of in CT.
Shed a few joules with better aerodynamics A team of engineering students from Laval University has managed to reduce the energy demand due to wind resistance of its Supermileage vehicle by 10% after carefully designing a new vehicle body with a 25% larger frontal area. Telemetry helps Formula SAE team close the loop on design Once a year, a team of students at Virginia Tech get to do something that ought to put a grin on any aspiring engineer's face: build a racecar. Unconventional steel wheel designs The drawings done by collegiate students for a steel wheel design competition had industry professionals thinking about future production possibilities.
Everything's looking up for aircraft with Internet connections Satellites will make global connectivity possible. Composite bonds put to the test The application of adhesive bonding as a joining technology for CFRP aircraft structures is essential for the realization of novel lightweight design concepts. Aerospace leads in additive manufacturing The unique advantages of making metal parts from powder-bed additive manufacturing are looking attractive to engine manufacturers. Europe's aerospace sector at a crossroads Europe is facing a massive black hole in its future defense procurement portfolio. What will replace today's fighters and trainers when the present order backlogs have been produced?
Material matters While new airplane designs now entering service will use more carbon-fiber composites than ever, it is no time to count out aluminum, as promising new versions of alloys such as aluminum-lithium gain ground.
Rhenium on the rise One of the rarest elements in the Earth's crust, rhenium featurse unique properties that make it desirable for various industries, including applications in aerospace such as jet engines.
Toward smarter manufacturing and materials At the U.K.'s new Advanced Manufacturing Research Center, engineers and innovators have at their disposal some of the world's most advanced design and manufacturing assets for precision engineering. More electric, integrated fuel systems Engine system reliability can be improved by advanced electric architectures, while the reduction of hydraulic components, fuel tubes, and fittings can enhance the maintainability of the engine and minimize pilot workload.
3-D manufacturing of titanium components takes off MRO providers are discovering ways to innovate their procedures while remaining viable and profitable through the current downturn in government spending. Commercial programs are flying high With economic regeneration underway this year, the rate of ordering new aircraft has been at an all-time high, with the result that backlogs for undelivered new production stretch well into the next decade for some popular models.
Materials become design, design becoems function Once things you could hold in your hand, materials have become more design ideas than entities, and the designs themselves are transforming into operational activity. The next steps in flight A look at sero engine and assembly developments as commercial airframe and engine manufacturers begin the biggest battle of all-for next-generation short-haul jet aircraft sales. NextGen Today and tomorrow The FAA has reached a major milestone on the Next Generation Air Transportation System initiative to modernize America's National Airspace System. Stacking the material deck for the 787 Combinations such as composites and titanium being used in future aircraft programs can be very challenging when drilling holes during manufacturing and assembly operations.
Advanced aluminum solutions for next-gen aerospace structures Airline competitiveness and the demand for improved aircraft performance and affordability (acquisition and operational) are driving advancements in technologies that can enable these improvements. 2050 vision Airbus provides a far-ranging, thought-provoking, reach-out toward some of the changes the commercial aerospace industry might expect to see by 2050.
Next-generation space transportation NASA narrows its search for a successor to the Space Shuttle. Air-traffic-control modernization "Aerospace Engineering" provides an update of the latest air-traffic management activities taking place in the U.S. and China. Aircraft undercarriage concept Engineers at SUS21 Co. Inc. and the Kyoto Institute of Technology have developed an aircraft suspension system that features shock isolation to reduce abrupt deceleration and impact force on aircraft wheels. Simulating Superplastic forming BAE Systems' engineers developed modeling tools and techniques to optimize superplastic forming of titanium structures.
Casting a vote for alloys Bringing lighter weight, improved performance, and enhanced repairability to airframes and engines. A sense of the future for UAVs Providing the unblinking eye for intelligence, surveillance, and reconnaissance. Light material brings heavy challenges Shift from aluminum to composites requires major changes in equipment, software. Ryan's 'Research' put to good use The Southwest Research Institue engineer assumes SAE President duties for 2008.
From concept in mind to product in hand Compatibility between tools for design and manufacturing engineers is improving, though it's still fraught with potential pitfalls. Cockpits on display Larger (and eventually bendable) flight displays use commercial technology for both new production and retrofit applications. Interior interests Makers of business aircraft take different approaches to designing interiors. Aerospace proves its metal Aluminum lithium, magnesium alloys, titanium metal matrix composites, and advanced coatings are all part of the future of flying.
Harold M. Cobb
This book provides a fascinating glimpse into a vital material that we may take for granted today. Stainless steel, called “the miracle metal” and “the crowning achievement of metallurgy” by the prominent metallurgist Carl Zapffe, is a material marvel with an equally fascinating history of people, places, and technology. As stainless steel nears the 100th anniversary of its discovery, this book is a fitting perspective on a vital material of our modern life, and it is the first book that captures the unfolding excitement and innovations of stainless steel pioneers and entrepreneurs. Amply illustrated with photographs, the book also includes a timeline that lists more than 450 important facts and events related to stainless steels technology and applications.
F H Froes
This new book covers all aspects of the history, physical metallurgy, corrosion behavior, cost factors and current and potential uses of titanium. The history of titanium is traced from its early beginnings through the work of Kroll, to the present day broadening market place. Extensive detail on extraction processes is discussed, as well as the various Beta to Alpha transformations and details of the powder metallurgy techniques. The relationship of microstructure to mechanical properties, and the topic of corrosion are described in detail. A comprehensive section presents applications of titanium. Anyone involved in any aspect of titanium science, technology, or application (including personnel in industry, government, and academia) can benefit from this book.
Hugo Leon, Blaine Geddes, Xiao Huang
Predominantly driven by the development of the gas turbine engine, the superalloy industry requires continuous advancement of mechanical performance boundaries. This practical guide provides an introduction for understanding the compositional complexity of superalloys, along with the wide range of alloys developed for specific applications. Topics include the basics of alloying, strengthening mechanisms, structure of superalloys, compositional effects, superalloy selection. Manufacturing characteristics such as castability, forgeability, and weldability are also discussed, along with current research in the field.
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