1 august 5, 2002 michelin confidential michelin “nzg” radial tyre
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1 August 5, 2002Michelin Confidential
Michelin “NZG” Radial TyreMichelin “NZG” Radial Tyre
2 August 5, 2002Michelin Confidential
NZG technology
Two types of Radial Tire Construction:
• Radial of nylon structure - Michelin current offer available since 1981. Is a proven design chosen on most new A/C.
• Radial NZG (Near Zero Growth) - studied since the end of 1999. Industrial propriety protected since mid 2000. NZG is an evolution for radial construction.
3 August 5, 2002Michelin Confidential
Our R&D team has developed a tire using a material with:
Higher modulus than nylon(Growth limited to less than 3%)
Modulus stable with temperature (Maintains geometry at high temperature)
NZG technology
4 August 5, 2002Michelin Confidential
0 5 10 15 20
Elongation (%)
Force
NEW CORD
NYLON CORD
Working point when tire inflated at rated pressure
“NZG” Casing and Belt Plies are made of much higher modulus cords
NZG technology
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Structure doesn’t grow under pressure(non-inflated tire size can be larger than equivalent bias tire )
Size of Grown and Thrown are comparable to non-inflated
Squared and balanced footprint
Ability to resist FOD / Tire survivability.
NZG technology / Advantages
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NZG technology / Advantages
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NZG technology / Advantages
10 August 5, 2002Michelin Confidential
NZG technology / Advantages
11 August 5, 2002Michelin Confidential
NZG technology / Advantages
12 August 5, 2002Michelin Confidential
NZG technology / Advantages
13 August 5, 2002Michelin Confidential
NZG technology / Advantages
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NZG technology / Advantages
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NZG technology / Advantages
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NZG technology / Advantages
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NZG technology / Advantages
18 August 5, 2002Michelin Confidential
NZG technology / Advantages
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FOD Resistance Demonstration
A two part approach :
Create the damage Demonstrate residual strength
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CREATE THE DAMAGECREATE THE DAMAGE
• Goal : Explore the full range of speed from 0 to takeoff
At low speed using a truck and a trailer in Almeria (Spain)
At higher speeds on a dynamometer flywheel in Ladoux (France)
FOD Resistance Demonstration
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FOD test with a trailer in Almeria
• The blade is 30 mm high, 3 mm wide at the bottom and 1.5 mm wide on the upper side
• Test at 2 speeds • Effect of inclination : 45°, 60° and 90°
• Only 90° blade resists the impact of the tire.
FOD Resistance Demonstration
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Test on trailer in Almeria
FOD Resistance Demonstration
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• Method used for high speed damage : • After a taxi, the tire initiates the take-off.
• At the required speed, the blade is thrown between tire and dynamometer by means of a pneumatic actuator.
FOD Resistance Demonstration
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Dynamometer equipment with net
FOD Resistance Demonstration
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The blade on the actuator
FOD Resistance Demonstration
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Blade on its plate
FOD Resistance Demonstration
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MEASURE THE RESIDUAL STRENGTHMEASURE THE RESIDUAL STRENGTH
After cutting the tire, run 3 consecutive dynamometer cycles
3 cycles of: taxi + takeoff + landing + taxi
FOD Resistance Demonstration
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FOD resistance of bias tire
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FOD resistance of Bias
Create damage
Low speed test at speed 1: - Tread and plies cut, no pressure
lossLow speed test at speed 2:
- Blow outHigh speed test:
- Blow out
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Bias tire at low speed 1 in Almeria
FOD resistance of Bias
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Bias tire at low speed 2 in Almeria
FOD resistance of Bias
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Bias tire after dynamometer test
FOD resistance of Bias
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Thrown parts of structure
FOD resistance of Bias
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Bias tyre at 20 km/h
FOD resistance of Bias
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Results of the NZG tire
FOD Resistance Demonstration
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Low Speed test at Almeria Create damage
- Tread band cut, no pressure loss, no debris
Residual strength 1 (taxi + TO + landing + taxi) 1 (taxi + TO* + landing + taxi)
= thrown tread
FOD Resistance Demonstration
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Damage at low speed
FOD Resistance Demonstration
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Low speed damage & Residual strength test
1.8 kg
FOD Resistance Demonstration
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NZG Tire High Speed test on dynamometer
Create damage- Tread band cut,no pressure loss, no debris
Residual strength Completed the 3 cycle test (no pressure loss, no debris)
FOD Resistance Demonstration
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Flywheel at high speed
FOD Resistance Demonstration
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Summary of results
Slow speed was more damaging than high speed
The NZG tire sustained all required endurance cycles without pressure loss. (structure was intact)
FOD Resistance Demonstration
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FOD Resistance Demonstration
Slow speed
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Michelin “NZG” Radial TyreMichelin “NZG” Radial Tyre
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