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众所周知,在交变应力下,当金属的应力强度因子范围超过其疲劳起始门坎值△kth/ρ~(1/2)时,裂纹处于非稳定状态,并开始扩张。因此,疲劳起始门坎值△kth/ρ~(1/2)的测定在理论研究和工程应用上具有重要的意义。 本文叙述了用升降法测定疲劳起始门坎值△kth/ρ~(1/2),这种方法原理比较简单,容易掌握,是当前测定疲劳起始门坎值△kth/ρ~(1/2)的一种较好的方法。求平均疲劳起始门槛值△kth/ρ~(1/2)的数据处理方
It is well-known that under alternating stress, when the stress intensity factor of metal exceeds the initial threshold value of fatigue △ kth / ρ ~ (1/2), the crack is unstable and begins to expand. Therefore, the determination of initial threshold value of fatigue △ kth / ρ ~ (1/2) is of great significance in theoretical research and engineering application. In this paper, the threshold value of fatigue initiation Δkth / ρ ~ (1/2) is measured by the lifting method. The principle of this method is relatively simple and easy to grasp. It is the current starting threshold value of fatigue △ kth / ρ ~ (1/2 ) A better way. Find the average threshold of fatigue onset △ kth / ρ ~ (1/2) data processing side