Toulouse Aeronautical Test Centre (CEAT) - FAA Fire Safety · PDF fileToulouse Aeronautical...
Transcript of Toulouse Aeronautical Test Centre (CEAT) - FAA Fire Safety · PDF fileToulouse Aeronautical...
Toulouse Aeronautical Test Centre (CEAT)« Fire Safety Department »
Serge LE NEVEE-mail : [email protected]
DEVELOPMENTOF A REPEATABLE
HIDDEN FIRE SOURCE
IAMFTWorking Group / Atlantic City / October 09 Diapositive N°2 / 31MINISTÈRE DE LA DÉFENSE
Reminder of the full test programReminder of the full test program
CEAT / Fire Safety Department(Toulouse Aeronautical Test Centre)
FIRE BEHAVIOUR OF STRUCTURAL COMPOSITE MATERIALS
Mechanical behaviour of composite materials submitted to a HiddeMechanical behaviour of composite materials submitted to a Hidden Fire Sourcen Fire Source
BurnthroughBurnthrough, Smoke & Toxicity of structural composite materials , Smoke & Toxicity of structural composite materials
IAMFTWorking Group / Atlantic City / October 09 Diapositive N°3 / 31MINISTÈRE DE LA DÉFENSE
FIRE BEHAVIOUR OF STRUCTURAL COMPOSITE MATERIALS
In-flight fire Post-crash fire
Hidden fire damagingElectric arc effects
Burnthrough behaviour Environmental effects on cabin
side (smoke / toxicity / heat release)
FULL TEST PROGRAM
To assess the fire behaviour of structural composite materials faced with the following threats :
IAMFTWorking Group / Atlantic City / October 09 Diapositive N°4 / 31MINISTÈRE DE LA DÉFENSE
HIDDEN FIRE DAMAGING
Interlaminar Shear Strength (ILSS)
Open Hole Compression (OHC)
Unnotched Tension (UT)
Unnotched Compression (UC)
Assessment of the mechanical behaviour of composite materials submitted to a hidden fire.
4-point-bending test
Clamped beam test
Under load fire tests (to be defined)
Fire damaged area
Fire test sample
Mechanical test specimens
Fire behaviour of structural composite materials
Residual mechanical characteristics Underload mechanical behaviour
CEAT / Fire Safety Department(Toulouse Aeronautical Test Centre)
IAMFTWorking Group / Atlantic City / October 09 Diapositive N°5 / 31MINISTÈRE DE LA DÉFENSE
To expose a large surface of the test samples
To submit the materials to various scenarios (various exposure times)
HIDDEN FIRE DAMAGING
4-point-bending test
Clamped beam test
Under load fire tests (to be defined)
Fire damaged area
Fire test sampleMechanical test specimens
Fire behaviour of structural composite materials
We need a repeatable fire source
CEAT / Fire Safety Department(Toulouse Aeronautical Test Centre)
IAMFTWorking Group / Atlantic City / October 09 Diapositive N°6 / 31MINISTÈRE DE LA DÉFENSE
Hidden Fire Source
DEVELOPMENTOF A REPEATABLE
HIDDEN FIRE SOURCE
CEAT / Fire Safety Department(Toulouse Aeronautical Test Centre)
IAMFTWorking Group / Atlantic City / October 09 Diapositive N°7 / 31MINISTÈRE DE LA DÉFENSE
We designed the fire source on the basis of the FAA foam block fire source characteristics, assuming that these characteristics are representative of a declared hidden fire :
Heat Flux Density / T° : The flame characteristics must be similar to the flame produced by the FAA foam block
Flame size : The fire source to be designed must be capable to produce an homogeneous damaged areacompatible with the mechanical test specimens to be removed (area ~ 150 mm X 300 mm)
SPECIFICATIONS
Hidden Fire Source
CEAT / Fire Safety Department(Toulouse Aeronautical Test Centre)
IAMFTWorking Group / Atlantic City / October 09 Diapositive N°8 / 31MINISTÈRE DE LA DÉFENSE
Typical flame profile of the foam block fire
T° at 3 inches from the foam top
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Foam 16kg/m3 + Heptane 10ml - Foam top to HF meter : 3 inches - 24/06/08
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Active burn time : ~ 1mn
Hidden Fire Source
CEAT / Fire Safety Department(Toulouse Aeronautical Test Centre)
Secondary burn time :the flames do not impinge the test samplethe HF is low (< 1W/cm²)
IAMFTWorking Group / Atlantic City / October 09 Diapositive N°9 / 31MINISTÈRE DE LA DÉFENSE
Repeatability of the foam block fire source
Hidden Fire Source
CEAT / Fire Safety Department(Toulouse Aeronautical Test Centre)
Nouvelle mousse 16kg/m3 + 10ml d' heptane - distance 3 pouces du fluxmètre supérieur (7969) - 05/08/09
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Ancienne mousse 16kg/m3 + 10ml d' heptane - distance 3 pouces du fluxmètre supérieur (7969) - 05/08/09
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Fo a m 1 6 k g /m 3 + He p t a n e 1 0 m l - Fo a m to p to HF m e te r : 3 in c h e s - 2 4 /0 6 /0 8
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Ancienne mousse 16kg/m3 + 10ml d' heptane - distance 3 pouces du fluxmètre supérieur (7969) - 05/08/09
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Good repeatability
IAMFTWorking Group / Atlantic City / October 09 Diapositive N°10 / 31MINISTÈRE DE LA DÉFENSE
Effect of the distance on the flame characteristics
Average T° vs Distance from foam top to plate
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max T° Av. T for 30'Av. T for 60'Av. T for 90'
Average Heat Flux vs Distance from foam top to plate
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max Heat FluxAv. HF for 30'Av. HF for 60'Av. HF for 90'
Various distances from the foam top to the plate were tested :
• 9 inches• 6 inches• 3 inches• 2 inches
Hidden Fire Source
CEAT / Fire Safety Department(Toulouse Aeronautical Test Centre)
The averages of T° and HF during the active burn time are relatively constant from 2 to 5/6 inches :
IAMFTWorking Group / Atlantic City / October 09 Diapositive N°11 / 31MINISTÈRE DE LA DÉFENSE
Final specifications
Av T°C d = 2 inches d = 3 inches d = 6 inches d = 9 inches
30" 697 700 588 447
60" 621 642 492 365
90" 494 495 375 278
Max : 805°C 781°C
Av HF (W/cm²) d = 2 inches d = 3 inches d = 6 inches d = 9 inches
30" 4,35 5 4,33 1,60 to 3,90
60" 4,05 4,75 3,32 0,65 to 2
90" 3,01 3,44 2,4 0,60 to 1,5
Max : 6,14 W/cm² 6,84 W/cm²
Fire source specifications :T° ~ 650 to 700 °CHeat Flux Density ~ 4 to 5 W/cm²
Hidden Fire Source
CEAT / Fire Safety Department(Toulouse Aeronautical Test Centre)
SPECIFICATIONS to be representative of the active fire stage at 2 / 3 inches :
IAMFTWorking Group / Atlantic City / October 09 Diapositive N°12 / 31MINISTÈRE DE LA DÉFENSE
ISO 2685 Gas Burner Lowest energetic flame
Heat flux Maping (3 inches above the burner)
The flame T° was too high (950 °C)
The Heat Flux profile was not homogeneous, with a very thin peak of HF.
Diameter = 152 mm
Several settings were tested, the lowest energetic flame was :
Hidden Fire Source
CEAT / Fire Safety Department(Toulouse Aeronautical Test Centre)
IAMFTWorking Group / Atlantic City / October 09 Diapositive N°13 / 31MINISTÈRE DE LA DÉFENSE
CEAT Hidden Fire Source
Experimental PROPANE burner made with 5 drilled tubes
(1st design)
Hidden Fire Source
CEAT / Fire Safety Department(Toulouse Aeronautical Test Centre)
IAMFTWorking Group / Atlantic City / October 09 Diapositive N°14 / 31MINISTÈRE DE LA DÉFENSE
Characterisation of the CEAT gas burner’s flame
Heat Flux density
T° Flame T° ~ 750 °C
Heat Flux ~ 5,5 W/cm²
The flame characteristics are homogeneous & close to the flame of the
foam block
CEAT Hidden Fire Source
Distance of measurement : 6 inches
Hidden Fire Source
CEAT / Fire Safety Department(Toulouse Aeronautical Test Centre)
IAMFTWorking Group / Atlantic City / October 09 Diapositive N°15 / 31MINISTÈRE DE LA DÉFENSE
T300 / 914 Carbon-EpoxyT300J or HTA / RTM6 Carbon-Epoxy
Surface exposed to the flame :
150 x 400 mm
Several tests were performed to compare the profile of T° on the back side of the test samples
Hidden Fire Source
CEAT / Fire Safety Department(Toulouse Aeronautical Test Centre)
Determination of the fire scenario equivalent to the foam block fire
IAMFTWorking Group / Atlantic City / October 09 Diapositive N°16 / 31MINISTÈRE DE LA DÉFENSE
Foam block tests (exposure time : 7 mn (complete burning of the foam)) d = 3 inches
Gas burner tests (exposure time : 45 s to 1 mn 30 s) d = 6 inches
Back side T° - foam block test - T300/914 - 24/09/08
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Back side T° - Foam block - T300/914 - 26/09/08
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Back side T° - Gas burner test - 60 s - T300/914 - 26/09/08
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Back side T° - Gas burner test - 1 mn 15 s - T300/914 - 26/09/08
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Back side T° - Gas burner test - 1 mn 30s - T300/914 - 25/09/08
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Back side T° - Gas burner test - 45 s - T300/914 - 26/09/08
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The back side maximum T° are close45 s gas burner test shows the more similar profile of T°
Determination of an equivalent fire scenario Comparison of the damage tests : Foam block / Gas burner
Hidden Fire Source
CEAT / Fire Safety Department(Toulouse Aeronautical Test Centre)
Equivalent scenario :Time of exposure : 45 sDistance burner / test sample : 6 inches
IAMFTWorking Group / Atlantic City / October 09 Diapositive N°17 / 31MINISTÈRE DE LA DÉFENSE
Non Destructive Investigation(Ultrasonic Phased Array Analysis)
Test 1 Test 2
45 s 60 s
Comparative damaging tests
Various materials and setting were investigated• T300 / 914 Carbon-Epoxy• HTA / RTM6 Carbon-Epoxy• T300J / RTM6 Carbon-Epoxy
Comparison of the damages : Foam block / Gas burner
Gas burner test
Foam block test
damages are homogeneoushidden fire source is a little bit more severe
Hidden Fire Source
CEAT / Fire Safety Department(Toulouse Aeronautical Test Centre)
IAMFTWorking Group / Atlantic City / October 09 Diapositive N°18 / 31MINISTÈRE DE LA DÉFENSE
Good agreement of the maximum T°
FOAM BLOCK Hidden Fire Source
Comparison of the back side T°Comparative damaging tests
Hidden Fire Source
CEAT / Fire Safety Department(Toulouse Aeronautical Test Centre)
5736-C259, 320*175 mm, 6 drilled tubes at 6", 1070 ln/h propane - 06/04/09
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5736-C259, 320*175 mm, Foam block at 3" - 07/04/09
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Good homogeneity
IAMFTWorking Group / Atlantic City / October 09 Diapositive N°19 / 31MINISTÈRE DE LA DÉFENSE
- Quite good homogeneity- Hidden fire source is a little bit more severe
FOAM BLOCKHidden Fire Source
Comparative damaging tests
Hidden Fire Source
CEAT / Fire Safety Department(Toulouse Aeronautical Test Centre)
NDI of the damages
5736 C239 5736 C239
IAMFTWorking Group / Atlantic City / October 09 Diapositive N°20 / 31MINISTÈRE DE LA DÉFENSE
- Quite good homogeneity- Hidden fire source is a little bit less severe
FOAM BLOCK Hidden Fire Source
Hidden Fire Source
CEAT / Fire Safety Department(Toulouse Aeronautical Test Centre)
NDI of the damages
5736 C2595736 C259
Comparative damaging tests
IAMFTWorking Group / Atlantic City / October 09 Diapositive N°21 / 31MINISTÈRE DE LA DÉFENSE
- Good homogeneity on the left side of the gas test sample- the large delaminated area is probably due to a defect of the material
Hidden Fire Source
CEAT / Fire Safety Department(Toulouse Aeronautical Test Centre)
NDI of the damages
6909 R266909 R26
FOAM BLOCK Hidden Fire Source
Comparative damaging tests
IAMFTWorking Group / Atlantic City / October 09 Diapositive N°22 / 31MINISTÈRE DE LA DÉFENSE
- Very good homogeneity- Very good agreement of the damages
Hidden Fire Source
CEAT / Fire Safety Department(Toulouse Aeronautical Test Centre)
NDI of the damages
6919 R266919 R26
FOAM BLOCK Hidden Fire Source
Comparative damaging tests
IAMFTWorking Group / Atlantic City / October 09 Diapositive N°23 / 31MINISTÈRE DE LA DÉFENSE
Hidden Fire Source (Propane)
Hidden Fire Source
CEAT / Fire Safety Department(Toulouse Aeronautical Test Centre)
- Burner size : 400mm x 370mm
- 6 drilled tubes of 8mm (inner diam.)
- Diameter of the drillings : 1.5mm
IAMFTWorking Group / Atlantic City / October 09 Diapositive N°24 / 31MINISTÈRE DE LA DÉFENSE
Hidden Fire Source (Propane)
Hidden Fire Source
CEAT / Fire Safety Department(Toulouse Aeronautical Test Centre)
- The burner is placed in a steel pan (404mm x 404mm)
- 2 ceramic plates on 2 sides to guide the flames from the lateral tubes
IAMFTWorking Group / Atlantic City / October 09 Diapositive N°25 / 31MINISTÈRE DE LA DÉFENSE
Hidden Fire Source
CEAT / Fire Safety Department(Toulouse Aeronautical Test Centre)
Mass Flow Controller
Hidden Fire Source (Propane)
- Gas flow rate : 1000 ln/h (standard conditions)
- Flow rate control : Mass Flow Controler
IAMFTWorking Group / Atlantic City / October 09 Diapositive N°26 / 31MINISTÈRE DE LA DÉFENSE
Burnthrough time :
7 mn 38 s
The fire source is very close to the FAA fire source used on wind tunnel test (under static conditions) (FAA burnthrough time is : 9 to 10 mn (thickness 3.175 mm (1/4 inch)):
• an estimation of the burnthrough time using our fire source on an aluminum plate of 3.2 mm thickness is around 9 mn 40 s.
Damaging test on aluminium plateAluminium plate – 2,5 mm
Hidden Fire Source
CEAT / Fire Safety Department(Toulouse Aeronautical Test Centre)
Thickness (mm)
T (mn)
2.5mm 3.175 mm
7 mn 38s
9 mn 40s
Time to burnthrough
IAMFTWorking Group / Atlantic City / October 09 Diapositive N°27 / 31MINISTÈRE DE LA DÉFENSE
45° test
Hidden Fire Source
CEAT / Fire Safety Department(Toulouse Aeronautical Test Centre)
- Good agreement for the maximum T°- HF is a little bit lower for the gas burner
IAMFTWorking Group / Atlantic City / October 09 Diapositive N°28 / 31MINISTÈRE DE LA DÉFENSE
45° test Test on : Glass-Epoxy / Aramid Honeycomb
Hidden Fire Source
CEAT / Fire Safety Department(Toulouse Aeronautical Test Centre)
Before test After test
- Due to the size of the gas burner, the size of the damaged area is different- The burn lengths are close
IAMFTWorking Group / Atlantic City / October 09 Diapositive N°29 / 31MINISTÈRE DE LA DÉFENSE
CONCLUSIONS
The gas fire source (at d=6”) generates the same flame characteristics (T° / Heat Flux) than the FAA foam block fire source (at d=3”)
The repeatability of the flame characteristics and of the damages generated on composite materials has been verified
The damages resulting from the gas fire source and from the FAA foam block are well correlated
Hidden Fire Source
CEAT / Fire Safety Department(Toulouse Aeronautical Test Centre)
IAMFTWorking Group / Atlantic City / October 09 Diapositive N°30 / 31MINISTÈRE DE LA DÉFENSE
NEXT WORKS
To run the first fire tests and the mechanical characterisations after a fire exposure
To define the other various scenarios of exposure(from 45s (ignition stage) to a duration to be determined simulating a declared hidden fire)
To define the test procedures for the under load fire test
To run the fabrication of the various composite materials to be tested
Hidden Fire Source
CEAT / Fire Safety Department(Toulouse Aeronautical Test Centre)
Toulouse Aeronautical Test Centre (CEAT)« Fire Safety Department »
Serge LE NEVE
E-mail : [email protected]
DEVELOPMENTOF A REPEATABLE
HIDDEN FIRE SOURCE