文章摘要
Study on Bending Fatigue Failure Mechanism of Steel Cord/Rubber Composites
Received:November 01, 2022  Revised:November 01, 2022
DOI：10.12136/j.issn.1000-890X.2024.08.0563
Key Words: steel cord/rubber composite；bending fatigue；non-destructive testing
Author NameAffiliationE-mail
FAN Wen Nanjing University of Science and Technology fanwen@njust.edu.cn 
JIA Yuxin Bekaert Asia Research and Development Center  
CHEN Rugan Bekaert Asia Research and Development Center  
LI Yusheng* Nanjing University of Science and Technology liyusheng@njust.edu.cn 
LIU Yilin Nanjing University of Science and Technology  
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Abstract:
      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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