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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…
 

For bonding dissimilar materials, adhesives can be a sticking point-or lack of it

Automotive Engineering: May 2019

Stuart Birch
  • Magazine Article
  • 19AUTP05_14
Published 2019-05-01 by SAE International in United States

As the auto industry adopts an increasingly wide mix of materials in its pursuit of constantly tougher weight-saving and service-longevity targets, joining mixed materials using precisely-compatible adhesives is a crucial aspect of the formula. Considering the expanding role of adhesives in the mixed-materials matrix, a new warning to design engineers comes from Peter Swanson, Managing Director of adhesives specialist Intertronics, of the need to fully appreciate through-life performance.

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High Accurate Heat Transfer Tasks on Example of Body in White Drying Process in Paint Shop

ESS Engineering Software Steyr GmbH-Saurabh Bhardwaj, Ralf Euser, Alexander Stadik, Ernesto Monaco, Vikas Kumar Sharma, Ravi Kanth Borra
Published 2019-04-02 by SAE International in United States
A challenging problem for any car industry is to completely dry the paint throughout the car body. The fulfillment of this task primarily depends on the accurate heat transfer between the car body and the fluid surrounding it. In the present study, we study the effect of thermal conductivity within the layers of thin sheets of the car body on transient heat transfer with the lattice Boltzmann method (LBM). The present investigation has been conducted using a three-dimensional (3D) incompressible thermal LB model using the D3Q19 lattice structure. A double distribution function approached is used where one distribution function stands for density distribution and other for temperature distribution. This model is also coupled with the multiple relaxation time (MRT) to increase the stability and accuracy of the solution. In our study, we first consider the heat transfer due to conduction and convection on the surface of car. Later, a test case has been set up for assembly line paint bake oven in which a car passes slowly through a large array of hot air jets.…
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Now You See It, Not You Don’t

Cold Jet LLC-Steve Wilson
Published 2019-04-02 by SAE International in United States
No matter how large or small of an operation, there is a great demand for automotive component manufacturers, increase the productivity of their equipment, improve the quality of their parts, all the while lowering costs. This can be a balancing act between using the most effective technology while working within a shrinking budget.This presentation discusses the advantages of dry ice cleaning solutions in a variety of automotive applications: 1) as a replacement for solvent and/or mechanical cleaning for the removal of contaminants from tooling, at operating temperature and while it is still in the production machine, 2) deflashing plastic molded parts, 3) removing excess film from IMD parts, and 4) the surface preparation of molded plastic parts prior to painting or coating, replacing traditional aqueous washing methods and subsequent drying.Supporting research from several independent studies (Kettering University, Materials & Process Associates, etc.) will be presented along with industry case studies, pictures and video clips to demonstrate the various proven solutions in the automotive industry.The reader will achieve an understanding of how to improve the environmental…
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Sealing Compound, Polythioether Rubber Fast Curing for Integral Fuel Tanks and General Purpose, Intermittent Use to 360 °F (182 °C)

AMS G9 Aerospace Sealing Committee
  • Aerospace Material Specification
  • AMS3277K
  • Current
Published 2019-02-08 by SAE International in United States
This specification covers polythioether rubber fuel resistant sealing compounds supplied as a two-component system which cures at room temperature.
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Sealing Compound, Fuel Resistant, Integral Fuel Tanks and Fuel Cell Cavities

AMS G9 Aerospace Sealing Committee
  • Aerospace Material Specification
  • AMSS8802E
  • Current
Published 2019-02-04 by SAE International in United States
This specification covers fuel-resistant, two-component polysulfide synthetic rubber compounds which cure at room temperature.
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Manufacturing Technique Helps Inkjet Printers Deliver Ink More Evenly

  • Magazine Article
  • TBMG-33708
Published 2019-02-01 by Tech Briefs Media Group in United States

When a coffee mug leaves a ring, the outer edges of that ring are darker than the inside of the ring. That's because the solute is separated from the liquid during the evaporation process — the coffee ring effect. This same effect can happen with printers. When printing a text document, the text itself consists of an outline of the letters and the inside of the letters. While it may not be visible to the untrained eye, the outlines are actually darker than the inside. This happens during the drying process, just like the coffee ring effect. Efforts have been made to find a way to remove this difference in pigmentation.

 

Polytetrafluoroethylene (PTFE) Resin Coating, Low Build, 370 to 400 °C (698 to 752 °F) Fusion

AMS P Polymeric Materials Committee
  • Aerospace Material Specification
  • AMS2515H
  • Current
Published 2018-11-26 by SAE International in United States
This specification establishes the engineering requirements for producing thin coatings of polytetrafluoroethylene (PTFE) resin on parts and the properties of such coatings.
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Polytetrafluoroethylene (PTFE) Resin Coating, High Build, 370 to 400 °C (698 to 752 °F) Fusion

AMS P Polymeric Materials Committee
  • Aerospace Material Specification
  • AMS2516F
  • Current
Published 2018-11-26 by SAE International in United States
This specification establishes the engineering requirements for producing thick coatings of polytetrafluoroethylene (PTFE) resin on parts and the properties of such coatings.
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Sealing Compound Aircraft Firewall, Silicone

AMS G9 Aerospace Sealing Committee
  • Aerospace Material Specification
  • AMS3374E
  • Historical
Published 2018-10-15 by SAE International in United States
This specification covers six types of silicone sealing compounds curing to elastomeric materials.
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