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Composite Fuselage Firefighting Issues

Composite Fuselage Firefighting Issues. International Aircraft Materials Fire Test Working Group Naples, FL 4 Mar 2009 By Doug Dierdorf, Ph.D. Principle Scientist Applied Research Associates, Inc. Extinguishing Burning Composite. OBJECTIVE:

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Composite Fuselage Firefighting Issues

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  1. Composite Fuselage Firefighting Issues International Aircraft Materials Fire Test Working Group Naples, FL4 Mar 2009 ByDoug Dierdorf, Ph.D.Principle ScientistApplied Research Associates, Inc

  2. Extinguishing Burning Composite • OBJECTIVE: • Determine the best method and agents to quickly and efficiently extinguish a variety of aircraft composites. • APPROACH: • Evaluate existing agents (Class A Foam, AFFF, heat absorbing gels) and applications techniques (such as UHP) to identify the most effective method to extinguish fires involving large amounts of composites. • Use standardized composite samples of carbon/epoxy carbon BMI composites • Use standard sized fire • Orient the composites in both horizontal and vertical configurations • Evaluating the effects of wicking fuel into delaminated composite layers.

  3. OBJECTIVE: • Determine the best method and agents to quickly and efficiently extinguish a variety of aircraft composites. • APPROACH: • Evaluate existing agents (Class A Foam, AFFF, heat absorbing gels) and applications techniques (such as UHP) to identify the most effective method to extinguish fires involving large amounts of composites. • Use standardized composite samples of carbon/epoxy carbon BMI composites • Use standard sized fire • Orient the composites in both horizontal and vertical configurations • Evaluating the effects of wicking fuel into delaminated composite layers. Define Test Fire • Key Features • Reproducible • Cost Effective • Realistic • “Robust” Fire • Difficult to Suppress • Susceptible to reignition • Test of Agents and Application Technologies • Not a test of Material!

  4. Pre-Burn • Defined by response time • How soon is the first truck on scene and fighting fires • Three to Five Minutes

  5. Composite Burn • Survivable Crashes • Rescue Crews must be able to enter aircraft safely • Interior fires must be extinguished and reignition prevented

  6. Composite Extinguished • Assess Damage to Composite • Residual strength • Hazard to rescue crew and disabled passenger

  7. ½ - ¾” 6” 3’ 2’ 1/8 - 3/16” Initial Sample Concept • Custom Fabricated Sample • Simulate Aircraft Component • Cost estimate $6,000 to $7,000 ea @ 100 units

  8. ▲ ▲ ▲ ▲ Low Cost Components • Sheets, rods, tubes and gussets • Fabricate Structures • Control Loading • Control Shape • Effect of Adhesive? Four Point Bend Loading Built-up Stringer

  9. Component Based Design 2’ X 3’ X 1/8”Carbon/Epoxy Sheet Pressure Bars for Four Point Bending Load PreliminaryConcept Drawing

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