Tires usually consist of rubber and reinforced metal wires.Understanding the elastic properties of the rubber material and evaluating the bond condition between the rubber and wires are important.In our work,rubber material properties were first studied.A sample set consisting of generic elastomeric compounds was analyzed using non-destructive air-coupled ultrasonic techniques.The longitudinal sound wave velocities in the sample and wave amplitude attenuation in the sample were measured using the Second Wave Inc.Non-Contact Analyzer 1000 (NCA1000).The results show that polymer type of rubber and the loading level of carbon black fillers in rubber can cause attenuation difference,this suggests the potential of amplitude attenuation measurement for (he rubber properties evaluation.Then samples cut from practical good and failed tires are imaged through ultrasonic C-Scan technique,the tire attenuation images show that the attenuation of good and failed tires arc almost the same,which means the rubber material is not the reason of the failure.However,rubber/wire interface images show that the interface disbond properly cause the failure of the tire.
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