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IMPROVEMENT OF COMPRESSIVE STRENGTH OF TIRE STEEL CODE FOR AUTOMOBILE

汽车轮胎钢抗压强度的提高规范

基本信息

批准号：
12650135
负责人：
IIZUKA Hiroshi
金额：
$ 1.66万
依托单位：
Yamagata University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2001
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12650135/
关键词：
Tire Steel cords FRR Bending fatigue Buckling Mechanical analysis Bending stress Cord construction 座屈破壊圧縮剛性

项目摘要

This project can be divided into three steps. The first step is a study on the observation of failure mode in steel cords during compression tests. The second step is associated with bending fatigue failure of steel cords. And in the last step, the authors propose a mechanical model of the bending fatigue failure steel cords.(1) Fatigue failure of steel wire was observed during compression tests. Although the loading mode was compression, the steel codes were buckling and bent. The authors analyzed the compression stiffness and confirmed that the buckling was easy to initiate for the cord-reinforced rubber. Namely, the failure mode was bending fatigue.(2) Therefore, the bending fatigue mechanism of steel cord was investigated caring out the bending tests and the observations. The constructions of 1×19, 3+9, 1×12, 1×12+Wr, and 4×3 were used for the investigation. The fatigue failure was initiated at the outer layer wires. Then the core wire was failed. A geometrical analysis revealed that the highest bending stress is initiated in the core wire. Namely, there are another factor to damage the cord wire during the bending.(3) A simplified mechanical model was proposed to explain the bending fatigue of steel cord. The authors consider the effect of friction force in wire axial direction between the wires. The friction force increases the stress in wire during the bending. The model reasonably well explains the relative strength between the cord constructions.

这个项目可以分为三个步骤。第一步是对压缩试验期间钢帘线中的失效模式的观察的研究。第二步是钢丝帘线的弯曲疲劳失效。最后提出了钢丝帘线弯曲疲劳破坏的力学模型。(1)在压缩试验中观察到钢丝的疲劳破坏。虽然加载模式是压缩，钢代码是屈曲和弯曲。对压缩刚度进行了分析，证实了帘线增强橡胶的屈曲容易发生。即，失效模式为弯曲疲劳。(2)因此，通过弯曲试验和观察，对钢丝帘线的弯曲疲劳机理进行了研究。研究中使用了1×19、3+9、1×12、1×12+Wr和4×3的结构。疲劳破坏起始于外层钢丝。然后芯丝失效。几何分析显示，最高弯曲应力起始于芯丝。也就是说，在弯曲过程中还有另一个因素会损坏帘线。(3)提出了一个简化的力学模型来解释钢丝帘线的弯曲疲劳。作者考虑了金属丝之间沿金属丝轴向的摩擦力的影响。在弯曲过程中，摩擦力增加了金属丝中的应力。该模型合理地解释了帘线结构之间的相对强度。