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前言本英国标准是在机械工程工业标准委员会的监督下,为了补充在国际标准化组织(ISO)技术委员会17,钢部分内拉力试验方面达成的相应国际协议而制订的。一个关于测定拉力试验系统K——值的ISO建议之产生是基于各种产品形状钢拉力试验ISO建议加之修订后的需要而作出的,这些修订已进一步被补入BS18全部修订的其他部分中去。为此,本标准规定了测定k—值的方法,使其在测量屈服应力时适用于达到间接控制应变
Preface This British Standard was prepared under the supervision of the Industrial Standards Committee of Mechanical Engineering to supplement the corresponding international agreements reached in the International Organization for Standardization (ISO) Technical Committee 17, Rally tests in the steel section. An ISO recommendation on the determination of the K-value of the tensile test system was made based on the ISO recommendations for various product shape steel tensile tests plus the revised requirements, which have been further incorporated into the remainder of the entire revision of BS 18 . To this end, this standard specifies the method of determination of k-value, making it suitable for measuring the yield stress to achieve indirect control of strain