Pic. 4.20. Cross section of a radial tire: 1 – tread block; 2 – tread groove; 3 - protector; 4 - nylon bandage; 5 - layers of cord; 6 - bead core; 7 – board amplifier; 8 - side rim protection
Nylon bandage 4, ply cords 5, bead cores 6 and bead reinforcements 7 form the carcass. The framework is «bearing element» tires.
Hit Damage
A bulge in the sidewall of a tire indicates carcass damage.
Pic. 4.21. Hitting a curb at an acute angle
typical «culprits» such damages are, for example, curbs when hitting them at an acute angle (pic. 4.21).
Because of this, the carcass of such a highly compressed tire can be damaged.
In this case, the tire carcass is strongly stretched, which leads to the rupture of individual fibers.
The extent of damage depends on the speed and angle of impact, tire pressure, axle load and type of obstacle.
Pic. 4.22. Impact/pinching marks in the sidewall of the tire
Note: Curbs should be avoided.
If you still need to drive onto the curb, then you should move over its edge at an obtuse angle and very slowly.
Pic. 4.23. Tire with torn carcass, inside view
Due to a strong impact, the frame pinched at the side flange and broke at the point of contact (pic. 4.23).
Internal tire damage due to impact (double break)
Pic. 4.24. double break
The double gap resulting from compression when hitting a curb is often invisible from the outside (pic. 4.24).
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