| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an evaluation method for breaker edge loose resistant (BEL resistant).SOLUTION: The durability testing method comprises a deterioration step, a travel step, and a determination step. The determination step determines presence/absence of breaker edge loose of the tire to which the deterioration step and the travel step were already performed. The tire belt complex elastic modulus is Eb, loss tangent is tanδb, tread complex elastic modulus is Et, and loss tangent is tanδtthese values are values before the deterioration step is performed. The belt complex elastic modulus is Eb, loss tangent is tanδb, tread complex elastic modulus is Eb, and loss tangent is tanδt, these values are values after the deterioration step is performed. Indoor temperature, oxygen concentration, tire air pressure, and holding period which are testing conditions of the deterioration step, are set so that a ratio of the complex elastic modulus (Eb/Eb) and a ratio (Et/Et), and a ratio of the loss tangent (tanδb/tanδb) and a ratio(tanδt/tanδt) before and after the deterioration step, are in a predetermined range respectively.</p> |
