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本文采用三点弯曲试样,提出了一种利用实测试样的载荷-位移[P-△]曲线计算启裂J积分值[J_i]的单试样测试方法。对几种典型的国产中低强钢进行的实验结果说明,用本文的单试样方法测定的J_i值同用标准多试样方法所测得的值符合很好。
In this paper, a three-point bending specimen is proposed and a single specimen testing method using the load-displacement [P-Δ] curve of the measured specimen to calculate the integral value of cracking J [J_i] is proposed. The experimental results of several typical low and medium strength domestic steels show that the J_i values measured by the single sample method in this paper are in good agreement with the standard multi-sample method.