275/70R22.5公交专用轮胎胎体钢丝帘线的微观界面剖析

对不同品牌的275/70R22.5公交专用轮胎使用后胎体钢丝帘线微观界面进行剖析。结果表明,0.20+6+12×0.175,3+9+15×0.175和3+9+15×0.175+0.15三种胎体钢丝帘线实际使用前后的破断力变化很小,H抽出力与新轮胎相比略小。A品牌选用0.20+6+12×0.175钢丝帘线,在胎侧屈挠区域胎体钢丝帘线内部完好无损,B和C品牌分别选用3+9+15×0.175和3+9+15×0.175+0.15钢丝帘线,胎侧屈挠区域钢丝帘线分别有明显的疲劳损伤现象。从B和C品牌轮胎的微观照片可以看出,钢丝帘线有明显疲劳磨损后产生的凹槽。

Analysis on Micro Interface of Carcass Steel Cord for 275/70R22.5 Bus Tire

The micro interface of carcass steel cord for different brands of 275/70R22.5 used bus tire was analyzed. The results showed that, compared with that of new tires, the breaking strength of 0.206＋12 × 0. 175,3＋9＋15×0. 175 and 3＋9＋15×0. 175＋0.15 carcass steel cords from used tire were similar, H pull-out force decreased slightly. For brand A with 0.20＋6＋ 12 ×0. 175 steel cord, the interior of carcass steel cord in the sidewall flexing region was intact. For brand B and C with 3＋ 9＋ 15 ×0. 175 and 3 ＋ 9 ＋ 15 ×0. 175＋ 0. 15 steel cord, respectively, the steel cords in the sidewall flexing region had obvious fatigue damage. The microscope photos of brand B and C tires indicated that the steel cord had grooves on the surface after fatigue wear.