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Performance Assessment of Pyramidal Lattice Core Sandwich Engine Hood for Pedestrian Safety

Mepco Schlenk Engineering College-Dhinesh Balasubramanian, Anish Jafrin Thilak Johnson
  • Technical Paper
  • 2019-28-0089
To be published on 2019-10-11 by SAE International in United States
Road accidents are increasing now-a-days, Safety of pedestrian is the great concern. In average, 10% of urban pedestrian accidents are fatal. Statistics show that the impact on front side of cars is the major cause of pedestrian deaths (83.5%). The function of a vehicle’s engine hood is to keep its engine covered and allow access to the engine compartment as required for maintenance and repair. The hood structure not only protects the engine cavity, but also keeps pedestrians away from the parts of that cavity. The absorption capability and stiffness of hood structures are the key points considered when designing a vehicle’s hood. The impact of the pedestrian head on automotive hood results in major injuries and sometimes in death. Conventional engine hood results in greater Head Injury Criterion (HIC) values. GFRP pyramidal lattice core structures are used in automobiles which is used for good energy absorption. GFRP pyramidal lattice core sandwich engine hood absorbs impact energy rather than transmitting it to the head. This will minimize the severity rate of injury of pedestrian during…
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Aluminum Alloy, Alclad Sheet and Plate, 5.6Zn - 2.5Mg - 1.6Cu - 0.23Cr, (7075; -T76 Sheet, -T7651 Plate), Solution and Precipitation Heat Treated

AMS D Nonferrous Alloys Committee
  • Aerospace Material Specification
  • AMS4316B
  • Current
Published 2019-09-10 by SAE International in United States

This specification covers an aluminum alloy in the form of Alclad sheet and plate 0.040 to 1.000 inch, incl (1.02 to 25.40 mm, incl) in nominal thickness (see 8.4).

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Aluminum Alloy, Sheet and Plate, Alclad, 4.4Cu - 1.5Mg - 0.60Mn (2024, -T3 Sheet/-T351 Plate with 1-1/2% Alclad), Solution Heat Treated, Cold Worked and Naturally Aged

AMS D Nonferrous Alloys Committee
  • Aerospace Material Specification
  • AMS4041T
  • Current
Published 2019-09-03 by SAE International in United States

This specification covers an aluminum alloy in the form of sheet and plate alclad two sides, over 0.187 to 1.000 inch (over 4.750 to 25.40 mm) in nominal thickness, supplied in the -T3/-T351 temper.

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Elastomer: Silicone Rubber (MQ/VMQ) Flame Retardant, Low Smoke Density, Low Smoke Toxicity, High Strength, 65 - 75 Durometer Type A Hardness For Products in Pressurized Aircraft Compartment Interiors

AMS CE Elastomers Committee
  • Aerospace Material Specification
  • AMS3310A
  • Current
Published 2019-08-30 by SAE International in United States

This specification covers a silicone (MQ/VMQ) elastomer that can be used to manufacture product in the form of molded sheet, strips, and shapes, color coded white in accordance with ARP1527.

Open Access
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Elastomer Swell Behavior in 1-Propanol, Diisobutylene, Cyclopentanone, and a Furan Mixture Blended in E10 and a Blendstock for Oxygenate Blending (BOB)

SAE International Journal of Fuels and Lubricants

Oak Ridge National Laboratory, USA-Michael D. Kass, Christopher J. Janke, Raynella M. Connatser, Brian West
  • Journal Article
  • 04-12-03-0011
Published 2019-08-21 by SAE International in United States
The compatibility of four potential bio-derived blendstock molecules with infrastructure elastomers was determined by measuring the volume change following exposure. The blendstock molecules included 1-propanol, diisobutylene, cyclopentanone, and a furan mixture. The elastomers included two fluorocarbons, six nitrile rubbers (NBRs), and one each of fluorosilicone, neoprene, polyurethane, and silicone. The elastomers were exposed to the fuel molecules as blends ranging from 0 to 30 vol.% in both a blendstock for oxygenate blending (BOB) formulation and an E10 fuel. Silicone exhibited excessive swelling in each test fuel, while the other elastomers showed good compatibility (low swell) with diisobutylene, 1-propanol, and the furan mixture when BOB was used as the base fuel. The E10 base fuel produced high (>30%) swell in neoprene, polyurethane, and some nitrile rubbers. In most cases diisobutylene produced the least amount of volume expansion. In contrast, the addition of cyclopentanone produced unacceptably high swelling in each elastomer and is not considered suitable for use with these fuels. Analysis of the results showed that the swelling behavior is predominantly due to the polarity of…
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Flux, Aluminum Welding

AMS B Finishes Processes and Fluids Committee
  • Aerospace Material Specification
  • AMS3414F
  • Current
Published 2019-08-20 by SAE International in United States

This specification covers an aluminum welding flux in the form of powder.

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Copper Wire, Bare, High Purity

AMS D Nonferrous Alloys Committee
  • Aerospace Material Specification
  • AMS4700E
  • Current
Published 2019-08-01 by SAE International in United States

This specification covers one type of copper in the form of wire.

High-Temperature Dielectric Nanocomposite

  • Magazine Article
  • TBMG-34899
Published 2019-08-01 by Tech Briefs Media Group in United States

A nanocomposite was developed that could be a superior high-temperature dielectric material for flexible electronics, energy storage, and electric devices. The nanocomposite combines one-dimensional polymer nanofibers and two-dimensional boron nitride nano-sheets. The nanofibers reinforce the self-assembling material while the white graphene nanosheets provide a thermally conductive network that allows it to withstand the heat that breaks down common dielectrics, the polarized insulators in batteries, and other devices that separate positive and negative electrodes.

Peridynamic Modeling: An Alternative Approach to Analyzing Material Failure

  • Magazine Article
  • TBMG-34871
Published 2019-08-01 by Tech Briefs Media Group in United States

A critical technology challenge for structural material applications in the aerospace and defense industries is to have a means for the reliable analysis of material damage and failure. Experimental structural assessments are typically expensive and often do not provide full information about coupled, multiscale damage processes. Computer-aided analysis has established itself as a useful tool for complementing experimental structural assessments. A comparative summary of current computer-aided approaches is presented in the accompanying table.

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Hybrid Ultra-Low VOC and Non-HAP Rain Erosion Coatings

Aerospace & Defense Technology: August 2019

  • Magazine Article
  • 19AERP08_12
Published 2019-08-01 by SAE International in United States

Developing a rapid-curing rain erosion coating based on a unique glycidyl carbamate (GC) hybrid resin chemistry that offers rapid reactivity and adhesion combined with the erosion, flexibility, weathering and mechanical properties of polyurethane systems.

Numerous military aircraft and shipboard surfaces, such as radomes, antennas, gun shields, wing leading edges, and helicopter blade leading edges, are coated with a specialized erosion-resistant protective coating possessing strict performance requirements. These protective coatings must provide excellent rain erosion resistance, superior mechanical properties, good adhesion to the substrate and meet a host of other metrics outlined in MIL-PRF-32239 and SAE AMS-C- 83231A.

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