| 钢丝帘线/橡胶复合材料弯曲疲劳失效机理的研究 |
| Study on Bending Fatigue Failure Mechanism of Steel Cord/Rubber Composites |
| 投稿时间：2022-11-01 修订日期：2022-11-01 |
| DOI：10.12136/j.issn.1000-890X.2024.08.0563 |
| 中文关键词: 钢丝帘线/橡胶复合材料 弯曲疲劳 无损检测 |
| 英文关键词: steel cord/rubber composite bending fatigue non-destructive testing |
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| 中文摘要: |
| 自主设计并搭建基于隧道磁阻传感器的无损检测系统，对钢丝帘线/橡胶复合材料试样（简称试样）弯曲疲劳失效机理进行研究。结果表明：无损检测方法可对疲劳试验后试样内部的损伤状态进行评估，无损检测系统可实现试样缺陷的在线检测；疲劳缺陷的产生是损伤累积，钢丝帘线单丝断裂主要发生试样疲劳寿命的最后阶段；试样内部钢丝疲劳断裂为穿晶解理断裂，裂纹扩展过程中存在一定程度的微观不连续性，包括多次角度偏折与裂纹分支；试样内部钢丝疲劳断口具有典型的低周疲劳特点，存在多个疲劳源与撕裂台阶，疲劳源间偶见撕裂棱，无明显贝纹样，疲劳源附近表面光滑，断口形成了较平滑的微撕裂形貌与粗糙的撕裂台阶形貌。 |
| 英文摘要: |
| A non-destructive testing system based on tunnel magnetoresistance sensor was independently designed and built，and the bending fatigue failure mechanism of steel cord/rubber composite sample（referred to as sample） was studied.The results showed that non-destructive testing method could evaluate the damage status inside the sample after fatigue testing，and the non-destructive testing system could achieve online detection of the defects of the sample.The generation of fatigue defects was the accumulation of damage，and single wire fracture of the steel cord mainly occured in the final stage of the fatigue life of the sample.The fatigue fracture of the steel wire inside the sample was transgranular cleavage fracture，and there was a certain degree of microscopic discontinuity during the crack propagation process，including multiple angle deviations and crack branching.The fatigue fracture of the steel wire inside the sample exhibited typical low cycle fatigue characteristics，with multiple fatigue sources and tear steps.Tear edges were occasionally observed between the fatigue sources，and there were no obvious bainitic patterns.The surface near the fatigue source was smooth，and the fracture formed a relatively smooth micro tear morphology and a rough tear step morphology. |
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