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Properties and Testing

Properties and Testing. Brent Strong. Properties. Combination of resin (matrix) and reinforcement Some properties are dominated by each but the combination is synergistic Determining the properties (testing). Solvent/moisture effects Thermal limitations Toughness

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Properties and Testing

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  1. Properties and Testing Brent Strong

  2. Properties • Combination of resin (matrix) and reinforcement • Some properties are dominated by each but the combination is synergistic • Determining the properties (testing)

  3. Solvent/moisture effects Thermal limitations Toughness Transverse strength and stiffness Damping Electrical properties Void content Processing conditions Bondability Interlaminar shear Surface hardness Surface finish Color Degradation in space Weathering Off-gassing Flammability Matrix-dominated properties

  4. Testing • Mechanical (tensile, compression) • Impact/toughness • Creep • Fatigue • Damping • Environmental (weathering, etc.) • Flammability • Stealth

  5. Tensile tester

  6. Impact tester

  7. Weatherometer

  8. Flammability − Cone calorimeter

  9. Chamber Sample Sample holder Gas manifold N2 O2 Limiting Oxygen Index

  10. B-2/B-52 Size Comparison

  11. Stealth Radiation Considerations • Radar • Infra-red • Visual from ground • Visual from above (satellite) • Visual from other aircraft • Sound • Con-trail • Radio transmissions • Ultraviolet • X-ray

  12. Object Jumbo Jet B-17 (WWII) B-47 (Korean War) B-52 (Cold War) B-1B (First stealth) Large jet fighter Small jet fighter Small single engine plane Man Small bird Insect F-117A (stealth fighter) B-2 (stealth bomber) Radar Cross Section (m2) 100 80 40 10 1.0 5-6 2-3 1.0 1.0 0.01 0.00001 0.1 0.01 Radar Cross Section of Typical Airborne Objects

  13. Thank you Brent Strong

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