Picture-book of Tyre Troubles
Page 20
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No. 8. The Cost of Overloading OVERLOADING results in forms of tyre failure which are strikingly similar to those caused by under-, inflation. The reason is fairly obvious. because M each case the tyre is unduly deflected, either from lack of air support or because of extreme load pressure from above.
The actual cause of failure can be summed up in two words— distortion and heat.
Distortion of the casing is caused by unnatural deflection, which accompanies all cases of overloading. The tyre is forced to assume a shape which is entirely different fronithat which the manufacturer intended, and, in this state of affairs, additional stresses are thrown on some parta of the tyre, whilst others are, to some extent relieved. Naturally, a condition such as this tends to lead to carcase fatigue and to ultimate failure.
Distortion also causes heat, which is the tyre's greatest enemy. Each separate ply of cord. is " working against its neighbour. This friction causes not only wear, but also leads to a rise in temperature. The rise in temperature has a deleterious effect on both rubber and cotton, and even further accelerates the rate of wear. And so it goes on.
L.V.B.