1 august 5, 2002 michelin confidential michelin “nzg” radial tyre

1 August 5, 2002Michelin Confidential

Michelin “NZG” Radial TyreMichelin “NZG” Radial Tyre


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.


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


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


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


FOD Resistance Demonstration

A two part approach :

Create the damage Demonstrate residual strength


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 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.



Test on trailer in Almeria



• 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.



Dynamometer equipment with net



The blade on the actuator



Blade on its plate



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 of bias tire


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


Bias tire at low speed 1 in Almeria



Bias tire at low speed 2 in Almeria



Bias tire after dynamometer test



Thrown parts of structure



Bias tyre at 20 km/h



Results of the NZG tire



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



Damage at low speed



Low speed damage & Residual strength test

1.8 kg



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)



Flywheel at high speed



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)




Slow speed


Michelin “NZG” Radial TyreMichelin “NZG” Radial Tyre

1 august 5, 2002 michelin confidential michelin “nzg” radial tyre

Documents