Characterizing the Intrinsic Strength (Fatigue Threshold) of Natural Rubber/Butadiene Rubber Blends

IF 0.9 Q4 ENGINEERING, MECHANICAL Tire Science and Technology Pub Date : 2019-12-11 DOI:10.2346/TIRE.19.170168

C. G. Robertson, R. Stoček, C. Kipscholl, William V Mars

{"title":"Characterizing the Intrinsic Strength (Fatigue Threshold) of Natural Rubber/Butadiene Rubber Blends","authors":"C. G. Robertson, R. Stoček, C. Kipscholl, William V Mars","doi":"10.2346/TIRE.19.170168","DOIUrl":null,"url":null,"abstract":"\n Tires require rubber compounds capable of enduring more than 108 deformation cycles without developing cracks. One strategy for evaluating candidate compounds is to measure the intrinsic strength, which is also known as the fatigue threshold or endurance limit. The intrinsic strength is the residual strength remaining in the material after the strength-enhancing effects of energy dissipation in crack tip fields are removed. If loads stay always below the intrinsic strength (taking proper account of the possibility that the intrinsic strength may degrade with aging), then cracks cannot grow. Using the cutting protocol proposed originally by Lake and Yeoh, as implemented on a commercial intrinsic strength analyzer, the intrinsic strength is determined for a series of carbon black (CB) reinforced blends of natural rubber (NR) and butadiene rubber (BR) typical of tire applications. The intrinsic strength benefits of the blends over the neat NR and BR compounds are only observed after aging at temperatures in the range from 50 to 70 °C, thus providing fresh insights into the widespread durability success of CB-filled NR/BR blends in tire sidewall compounds and commercial truck tire treads.","PeriodicalId":44601,"journal":{"name":"Tire Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.9000,"publicationDate":"2019-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"11","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Tire Science and Technology","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.2346/TIRE.19.170168","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"ENGINEERING, MECHANICAL","Score":null,"Total":0}

引用次数: 11

Abstract

Tires require rubber compounds capable of enduring more than 108 deformation cycles without developing cracks. One strategy for evaluating candidate compounds is to measure the intrinsic strength, which is also known as the fatigue threshold or endurance limit. The intrinsic strength is the residual strength remaining in the material after the strength-enhancing effects of energy dissipation in crack tip fields are removed. If loads stay always below the intrinsic strength (taking proper account of the possibility that the intrinsic strength may degrade with aging), then cracks cannot grow. Using the cutting protocol proposed originally by Lake and Yeoh, as implemented on a commercial intrinsic strength analyzer, the intrinsic strength is determined for a series of carbon black (CB) reinforced blends of natural rubber (NR) and butadiene rubber (BR) typical of tire applications. The intrinsic strength benefits of the blends over the neat NR and BR compounds are only observed after aging at temperatures in the range from 50 to 70 °C, thus providing fresh insights into the widespread durability success of CB-filled NR/BR blends in tire sidewall compounds and commercial truck tire treads.

查看原文

微信好友朋友圈 QQ好友复制链接

本刊更多论文

天然橡胶/丁二烯橡胶共混物的固有强度(疲劳阈值)表征

轮胎要求橡胶混合物能够承受108次以上的变形循环而不产生裂纹。评估候选化合物的一种策略是测量内在强度，也称为疲劳阈值或耐力极限。本征强度是去除裂纹尖端场能量耗散增强作用后材料中剩余的强度。如果载荷始终低于本征强度(适当考虑本征强度随时效而降低的可能性)，则裂纹无法扩展。采用Lake和Yeoh最初提出的切割方案，并在商用固有强度分析仪上实现，对一系列典型轮胎应用的天然橡胶(NR)和丁二烯橡胶(BR)的炭黑(CB)增强共混物的固有强度进行了测定。这些共混物相对于纯NR和BR化合物的内在强度优势只有在50至70°C的温度范围内老化后才能观察到，从而为cb填充NR/BR共混物在轮胎侧壁化合物和商用卡车轮胎胎面中广泛的耐久性成功提供了新的见解。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文去求助

来源期刊

Tire Science and Technology ENGINEERING, MECHANICAL-

CiteScore

2.10

自引率

0.00%

发文量

期刊介绍： Tire Science and Technology is the world"s leading technical journal dedicated to tires. The Editor publishes original contributions that address the development and application of experimental, analytical, or computational science in which the tire figures prominently. Review papers may also be published. The journal aims to assure its readers authoritative, critically reviewed articles and the authors accessibility of their work in the permanent literature. The journal is published quarterly by the Tire Society, Inc., an Ohio not-for-profit corporation whose objective is to increase and disseminate knowledge of the science and technology of tires.