1. Michelin “NZG” Radial Tyre

2. NZG technology Two types of Radial Tire Construction:
Radial of nylon structure - Michelin current offer available since Is a proven design chosen on most new A/C.
Radial NZG (Near Zero Growth) - studied since the end of Industrial propriety protected since mid NZG is an evolution for radial construction.

3. NZG technology
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)

4. Working point when tire inflated at rated pressure
NZG technology 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

7. NZG technology / Advantages
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.

8. NZG technology / Advantages

9. NZG technology / Advantages

10. NZG technology / Advantages

11. NZG technology / Advantages

12. NZG technology / Advantages

13. NZG technology / Advantages

14. NZG technology / Advantages

15. NZG technology / Advantages

16. NZG technology / Advantages

17. NZG technology / Advantages

18. NZG technology / Advantages

19. FOD Resistance Demonstration
A two part approach :
Create the damage
Demonstrate residual strength

20. FOD Resistance Demonstration
CREATE 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)

21. FOD Resistance Demonstration
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.

22. Test on trailer in Almeria
FOD Resistance Demonstration
Test on trailer in Almeria

23. FOD Resistance Demonstration
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.

24. Dynamometer equipment with net
FOD Resistance Demonstration
Dynamometer equipment with net

25. The blade on the actuator
FOD Resistance Demonstration
The blade on the actuator

26. FOD Resistance Demonstration
Blade on its plate

27. FOD Resistance Demonstration
MEASURE THE RESIDUAL STRENGTH
After cutting the tire, run 3 consecutive dynamometer cycles
3 cycles of: taxi + takeoff + landing + taxi

28. FOD resistance of bias tire

29. FOD resistance of Bias Create damage
Low speed test at speed 1: - Tread and plies cut, no pressure loss
Low speed test at speed 2: - Blow out
High speed test: - Blow out

30. Bias tire at low speed 1 in Almeria
FOD resistance of Bias
Bias tire at low speed 1 in Almeria

31. Bias tire at low speed 2 in Almeria
FOD resistance of Bias
Bias tire at low speed 2 in Almeria

32. Bias tire after dynamometer test
FOD resistance of Bias
Bias tire after dynamometer test

33. Thrown parts of structure
FOD resistance of Bias
Thrown parts of structure

34. FOD resistance of Bias
Bias tyre at 20 km/h

35. FOD Resistance Demonstration
Results of the NZG tire

36. FOD Resistance Demonstration
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

37. FOD Resistance Demonstration
Damage at low speed

38. Low speed damage & Residual strength test
FOD Resistance Demonstration
Low speed damage & Residual strength test
1.8 kg

39. NZG Tire High Speed test on dynamometer
FOD Resistance Demonstration
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)

40. FOD Resistance Demonstration
Flywheel at high speed

41. FOD Resistance Demonstration
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)

42. FOD Resistance Demonstration
Slow speed

43. Michelin “NZG” Radial Tyre