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Dynamic Characterization of FDM 3D-Printed Parts

Karlsruhe Institute of Technology-Manuel Bopp, Matthias Behrendt
  • Technical Paper
  • 2020-01-1561
To be published on 2020-06-03 by SAE International in United States
With substantial progress in additive manufacturing (AM) technology in the recent years, AM parts are on the verge of becoming an economical option for small series manufacturing and on-demand spare parts. Especially Filament-Deposition-Modeling (FDM) has found widespread use in industrial as well as in private applications due to its many advantages like multi material manufacturing, its wide range of available materials, low overall cost and easy handling. Depending on the specific application, the dynamic behavior of a structure can be critical, for example when designing resonating absorber elements, to avoid unwanted resonance-coupling with other parts, or regarding the general vibrational and acoustic behavior. To predict the dynamic behavior of a structure, two of the most important parameters are the storage modulus and loss modulus of the material. In polymers these parameters are typically frequency-dependent and in the case of FDM manufactured parts they are also strongly anisotropic, due to the layer- and path-wise fabrication process. In this study different samples of FDM 3D-printed ABS parts are investigated. First the effect of various slicing and printing…
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An Experimental Investigation of Axial Cutting Under a Tension Deformation Mode

University of Windsor-Anthony Gudisey, William Altenhof, John Magliaro
  • Technical Paper
  • 2020-01-0206
To be published on 2020-04-14 by SAE International in United States
The most common use of tension energy absorption is found in personal fall arrest systems, however, there exist a plethora of possible applications in the automotive field for both vehicular and roadside safety hardware. During a fall, cables attached to a safety harness must not exceed a maximum arresting force over an arresting extension. The main disadvantage of the current state of the art for fall arrest is that energy dissipation is a result of tearing and failure of fabric materials which causes erratic and fluctuating loads. Axial cutting; a novel energy dissipation mechanism developed by researchers at the University of Windsor, has been shown to minimize load fluctuations while maintaining a stable load. Its capabilities have been explored in compression, but no studies have been conducted in tension. A set of test specimens were chosen for this purpose based on predictions from analytical models. These specimens were circular extrusions made from AA6061 in both T4 and T6 temper conditions. They varied in diameter from 50.8 to 63.5mm, and varied in thickness from 1.25, 1.59…
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Streamlined Tails – The Effects of Truncation on Aerodynamic Drag

Loughborough University-Jeff Howell, Eleanor Rajaratnam, Martin Passmore
  • Technical Paper
  • 2020-01-0673
To be published on 2020-04-14 by SAE International in United States
Significant aerodynamic drag reduction is obtained on a bluff body by tapering the rear body. In the 1930’s it was found that a practical low drag car body could be achieved by cutting off the tail of a streamlined shape. The rear end of a car with a truncated tail is commonly referred to as a Kamm back. It has often been interpreted as implying that the drag of this type of body is almost the same as that for a fully streamlined shape. From a review of the limited research into truncated streamlined tails it is shown in this paper that, while true for some near axisymmetric bodies, it is not the case for many more car-like shapes. For these shapes the drag reduction from an elongated tail varies almost linearly with the reduction in cross section area. A CFD simulation to determine the drag reduction from a truncated streamlined tail of variable length on the simple Windsor Body is shown by way of confirmation.
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Frequency Domain Loads Processing For Exhaust Systems

CAEfatigue, Ltd.-Neil Bishop
Eberspaecher Exhaust Technology GmbH-Philippe Leisten, Arnulf Spieth
  • Technical Paper
  • 2020-01-0180
To be published on 2020-04-14 by SAE International in United States
A previous SAE paper (2018-01-1396) introduced the concept of using the frequency domain for exhaust system analysis. During the intervening period (up until now) further benchmarks have confirmed the validity of the approach. This paper will present that data and also introduce a new technique which has been developed to create, from the originating road load data (RLD), the loads (or “cutting plane” loads) at different section of the exhaust system. Those loads can then be used to determine safety factors against the available part SN curves at any potential position desired. This advantage stands in opposition to predetermined strain gage positioning for measurement procedures. Another potential lies in a better definition of the loads applied form the exhaust system on typical supplier part, like flexpipes and thus allow a better design of those parts.
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Titanium Alloy, Welding Wire 6AI - 2Sn - 4Zr - 2Mo

AMS G Titanium and Refractory Metals Committee
  • Aerospace Material Specification
  • AMS4952G
  • Current
Published 2020-03-18 by SAE International in United States
This specification covers a titanium alloy in the form of welding wire.
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Test Methods for Insulated Electric Wire

AE-8D Wire and Cable Committee
  • Aerospace Standard
  • AS4373F
  • Current
Published 2020-03-12 by SAE International in United States
This standard describes test methods for insulated, single conductor, electric wire intended for aerospace applications. Particular requirements for the wire being tested need to be specified in a procurement document or other detail specification. Suggested minimum requirements are included in the notes at the end of some of the test methods. SAE Performance Standard AS4372 uses some of the tests in this document for evaluating comparative performance of aerospace wires.
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Advances in Drilling with PCD (Polycrystalline Diamond)

Facet Precision Tool GmbH-Jeremy Bunting, John Bunting
  • Technical Paper
  • 2020-01-0035
Published 2020-03-10 by SAE International in United States
PCD properties were optimized to drill stacks of CFRP/Ti using an accelerated wear test milling gray cast iron. The optimized PCD was then used to prepare PCD drills. Tests were made to determine the best drilling conditions for the optimized PCD. The results yielded a significant improvement in cycle times as compared to earlier studies using PCD drills. Notched PCD cutting edges were found to eliminate oversizing of the CFRP near the interface of the two materials.
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Tool Wear Analysis on Drilling Process of Inconel 718 Superalloy

Federal University of Sao Carlos-Pedro Cabegi Barros, Gustavo Franco Barbosa, Carlos Eiji Hirata Ventura
OSG Sulamericana-Gustavo Roberto Santos
  • Technical Paper
  • 2020-01-0034
Published 2020-03-10 by SAE International in United States
The Inconel 718 is an alloy based on nickel of high thermal and mechanical resistance, which allows its wide application in the aerospace industry, being generally implemented in aircraft tail cone and engine components. On the other hand, these features become a recurring problem when the machining of this material is performed. For example, in the drilling process of this superalloy, the cutting tools used exhibit excessive wear due to the high temperature and pressure at the cutting edge. However, there are numerous parameters that can influence the cutting tool life, and when analyzed and well defined, determine the types of modifications needed to enable less wear, and consequently an increase of its useful life in service. Given this context and knowing that the study of tool life in the Inconel 718 drilling process is extremely relevant in the aerospace sector, this paper presents a wear study in order to evaluate the behavior of different types of cutting tools used to drill the Inconel 718. It was accomplished by the combination of different cutting parameters…
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NASA Space Data Can Cut Disaster Response Times, Costs

  • Magazine Article
  • TBMG-36140
Published 2020-03-01 by Tech Briefs Media Group in United States

In the first NASA study to calculate the value of using satellite data in disaster scenarios, researchers at NASA's Goddard Space Center in Maryland, calculated the time that could have been saved if ambulance drivers and other emergency responders had near real-time information about flooded roads, using the 2011 Southeast Asian floods as a case study. Ready access to this information could have saved an average of nine minutes per emergency response and potential millions of dollars, they said. The study is a first step in developing a model to deploy in future disasters, according to the researchers.

new

Marubeni Citizen-Cincom Opens New Technical Center

  • Magazine Article
  • TBMG-36273
Published 2020-03-01 by Tech Briefs Media Group in United States

Marubeni Citizen-Cincom Inc. (MCC) has opened a new technical center in Agawam, MA. The company is holding a ribbon cutting and grand opening celebration March 9. An open house will follow to introduce the company’s new L12 Type X and the new 12 mm laser cutting and welding machine. A variety of Cincom sliding headstock and Miyano fixed headstock lathes will be on display as well. The event will also include technical seminars presented by Sandvik, Esprit, and Gen Swiss.