采用引伸计法与手工法对HRB600级钢筋的最大力总延伸率进行测试,分析了两种不同的测试方法对测试结果的影响,对手工法测试最大力总延伸率的不确定度进行了评定。结果表明:手工法测试最大力总延伸率的结果大于引伸计法测试最大力总延伸率的结果;测试位置对手工法的测试结果有较大的影响,随着与断口的距离逐渐增大,试样的最大力总延伸率逐渐变小;当区间的置信概率为95%时,手工法测试最大力总延伸率的不确定度评定结果为4%。

The maximum force total elongation of HRB600 grade steel bars was tested using the extensometer method and the manual method. The impact of two different testing methods on the test results was analyzed, the uncertainty of the manual method for testing the maximum force total elongation was evaluated. The results show that the results of manual testing for maximum force total elongation were greater than those of extensometer testing for maximum force total elongation. The testing position had a significant impact on the testing results of the manual method. As the distance from the fracture gradually increased, the maximum force total elongation of sample gradually decreased. When the confidence probability of the interval was 95%, the uncertainty evaluation result of the manual method for testing the maximum force total elongation was 4%.