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本文对文献提出的快速测试钢材S-N曲线的方法,特别是确定初始裂纹尺寸的方法作了若干改进,并用来测定40Cr钢的S-N曲纨此外。还用常规方法测定了同种材料的持久极限。用两种方法得到的对应于应力循环数为10~7次的持久极限,数值很接近,证明本文提出的改进方法快速而又可靠,是一种有实用价值的方法。
In this paper, the methods proposed in the literature for quickly testing the S-N curve of steel, especially for determining the initial crack size, have been improved and used to determine the S-N curve of 40Cr steel. The same method is also used to determine the endurance limit of the same material. The results show that the improved method proposed in this paper is fast and reliable, and it is a practical method to obtain the long-term limit of 10-7 cycles with stress cycles.