Originally Posted By: used_0il
The most obvious tire failures are the tread separations from large trucks using re-capped tires......
I just want to be clear, that it isn't the recap that is failing. It's the casing that is failing - and mostly this is due to the number of times a tire gets recapped. It's a durability failure.
Originally Posted By: used_0il
....You can see these "alligators" along side of the highway, or you might drive over one.
Under inflation or running flat would be the most likely cause of this type of tire failure........
Run Flat failures are distinctively different than casing failures. Run Flats are basically sidewall failures - in that when a tire is deflated, the tread is trying to rotate at one speed, but the wheel is running at another speed, and that difference results in rubbing in the inside and the outside of the tire. It sort of tears the sidewall apart.
Originally Posted By: used_0il
...... Tire re-cap plants say those tread separations are not a result of failure of the bonding agent, but "case failure".
OK, what is case failure?.......
I think they mean casing failure - and that is a fatigue failure - that is, the number of rotations (cycles) the tire has been subjected to, vs the load on the tire.
Look up "Fatigue (Material)" in Wikipedia.
Wikipedia - Fatigue (material)
Pay particular attention to the SN Curve. It is the key to understanding how things can fail from extended usage.
Originally Posted By: used_0il
......
Does the separation of tread from tire occur as "belt leaving belt" or sidewall problems?....
The typical tread separation is a belt leaving belt separation. It is caused by a fatigue failure under the edge of top belt - which is the most highly stressed area in a tire.
There are lots of things that can be done in the design to improve the fatigue life in this area, but the most visible to the average consumer is the use of cap plies - the more the better.
Originally Posted By: used_0il
...... (I think I just gave away what I've been reading today.)....
Yes, you did!!
The most obvious tire failures are the tread separations from large trucks using re-capped tires......
I just want to be clear, that it isn't the recap that is failing. It's the casing that is failing - and mostly this is due to the number of times a tire gets recapped. It's a durability failure.
Originally Posted By: used_0il
....You can see these "alligators" along side of the highway, or you might drive over one.
Under inflation or running flat would be the most likely cause of this type of tire failure........
Run Flat failures are distinctively different than casing failures. Run Flats are basically sidewall failures - in that when a tire is deflated, the tread is trying to rotate at one speed, but the wheel is running at another speed, and that difference results in rubbing in the inside and the outside of the tire. It sort of tears the sidewall apart.
Originally Posted By: used_0il
...... Tire re-cap plants say those tread separations are not a result of failure of the bonding agent, but "case failure".
OK, what is case failure?.......
I think they mean casing failure - and that is a fatigue failure - that is, the number of rotations (cycles) the tire has been subjected to, vs the load on the tire.
Look up "Fatigue (Material)" in Wikipedia.
Wikipedia - Fatigue (material)
Pay particular attention to the SN Curve. It is the key to understanding how things can fail from extended usage.
Originally Posted By: used_0il
......
Does the separation of tread from tire occur as "belt leaving belt" or sidewall problems?....
The typical tread separation is a belt leaving belt separation. It is caused by a fatigue failure under the edge of top belt - which is the most highly stressed area in a tire.
There are lots of things that can be done in the design to improve the fatigue life in this area, but the most visible to the average consumer is the use of cap plies - the more the better.
Originally Posted By: used_0il
...... (I think I just gave away what I've been reading today.)....
Yes, you did!!