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Local Weakening of Honeycomb Core for Improved Surface Quality and Bonding in Co-cured Sandwich Panels

Hamburg University of Technology-Henrik Eschen, Thorsten Schüppstuhl
  • Technical Paper
  • 2019-01-1859
To be published on 2019-09-16 by SAE International in United States
Sandwich panels made of NOMEX honeycomb core and fiber reinforced face sheets are a major component of aircraft interior parts. A common way to locally increase the strength of such panels, e.g. for load introduction, is the local thickening of the face sheets with additional prepreg layers. Curing of such strengthened panels without further processing of the core leads to higher flatness tolerances due to the added thickness as well as residual stresses. Machining of the core in the strengthened areas is possible, but expensive due to high machine costs and additional cleaning processes. In this paper a new automated process for the reduction of the residual stresses in strengthened areas is presented. The process is based on a local reduction of the compressive strength in the surface area of the honeycomb core, which allows for a plastic deformation in thickened areas at curing pressure. For the reduction of compressive strength, a concept based on a robot guided tool with multiple parallel blades is presented. A model based analysis of the process parameters shows that…
 
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Test Strip, Holder, and Gage for Shot Peening

Surface Enhancement Committee
  • Ground Vehicle Standard
  • J442_201906
  • Current
Published 2019-06-06 by SAE International in United States

This SAE standard defines requirements for equipment and supplies to be used in measuring shot peening arc height and other surface enhancement processes. Guidelines for use of these items can be found in SAE J443 and SAE J2597.

 
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Eyes in the Sky: HD Ethernet Cameras Take Flight Test Imagery to New Heights

  • Magazine Article
  • TBMG-34540
Published 2019-06-01 by Tech Briefs Media Group in United States

There is increasing demand for high-quality High Definition (HD) video for airborne applications such as Flight Test Instrumentation (FTI). Ideally, such new camera solutions can reduce the weight and difficultly of installing wiring, and enable data to be coherently combined with image data. Ethernet cameras can address these needs with built-in compression and multiple output streams. Additionally, as Ethernet-based networks have become an attractive choice for FTI applications, we see increased requirements for integrating Ethernet-based cameras with FTI data acquisition equipment, network recorders, and telemetry systems as this removes duplication of wiring and devices.

 
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Eyes in the Sky

Aerospace & Defense Technology: June 2019

  • Magazine Article
  • 19AERP06_01
Published 2019-06-01 by SAE International in United States

Rugged High-Speed Cameras Capture Critical Flight Test Video Data

There is increasing demand for high-quality High Definition (HD) video for airborne applications such as Flight Test Instrumentation (FTI). Ideally, such new camera solutions can reduce the weight and difficultly of installing wiring, and enable data to be coherently combined with image data. Ethernet cameras can address these needs with built-in compression and multiple output streams. Additionally, as Ethernet-based networks have become an attractive choice for FTI applications, we see increased requirements for integrating Ethernet-based cameras with FTI data acquisition equipment, network recorders, and telemetry systems as this removes duplication of wiring and devices.

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SAE No. 2 Friction Test Machine µPVT Test

Automatic Transmission and Transaxle Committee
  • Ground Vehicle Standard
  • J2490_201905
  • Current
Published 2019-05-31 by SAE International in United States

This SAE Recommended Practice is intended as the definition of a standard test, which may be subject to frequent change to keep pace with experience and technical advances. This should be kept in mind when considering its use.

 
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Aerospace Hand Torque Wrenches (Mechanical, Impulse)

EG-1B Hand Tools Committee
  • Aerospace Standard
  • AS28431A
  • Current
Published 2019-05-10 by SAE International in United States
This SAE International Aerospace Standard covers requirements for micrometer adjustable, feel impulse, torque wrenches. The torque wrench is used to apply a pre-set torque to threaded fasteners and other torque requirements.
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J1979-DA, Digital Annex of E/E Diagnostic Test Modes

Vehicle E E System Diagnostic Standards Committee
  • Ground Vehicle Standard
  • J1979DA_201905
  • Current
Published 2019-05-08 by SAE International in United States

On-Board Diagnostic (OBD) regulations require passenger cars, and light and medium duty trucks, to support communication of a minimum set of diagnostic information to off-board “generic” test equipment. This document specifies the diagnostic data which may be required to be supported by motor vehicles and external test equipment for diagnostic purposes which pertain to motor vehicle emission-related data. SAE J1979 was originally developed to meet U.S. OBD requirements for 1996 and later model year vehicles. ISO 15031 5 was based on SAE J1979 and was intended to combine the U.S. requirements with European OBD requirements for 2000 and later model year vehicles.

 

LED Lighting Improves Efficiency and Imaging

  • Magazine Article
  • TBMG-34397
Published 2019-05-01 by Tech Briefs Media Group in United States

Rocket engine testing requires a lot of light since all tests are filmed with high-speed cameras to monitor performance; however, those cameras have to adjust to the bright plume from a firing engine, which would black out the rest of the image. Traditionally, that light has been provided by metal halide bulbs.

 

S-Curve Time-of-Flight Mass Spectrometer

  • Magazine Article
  • TBMG-34406
Published 2019-05-01 by Tech Briefs Media Group in United States

Time-of flight mass spectrometers are commonly used in analytical chemistry and many other applications. They contain a region where ions travel toward a detector. A new geometry was developed that has improved performance over existing designs.

 

Ultrasonic Inspection Thin Wall Metal Tubing

AMS K Non Destructive Methods and Processes Committee
  • Aerospace Material Specification
  • AMS2634B
  • Current
Published 2019-04-24 by SAE International in United States
This specification covers procedures for ultrasonic inspection of thin wall metal tubing of titanium, titanium alloy, and corrosion and heat resistant steels and alloys having nominal OD over 0.1875 inch (4.762 mm) with OD to wall thickness ratio of 8 or greater and wall thickness variation not exceeding ±10% of nominal.
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