From the micro-region view-point, the five stages of fatigue take place successively, and some new explanations for the fatigue hardening, softening and fracture are given.

从微区观点，提出了疲劳过程包含五个阶段，并对其中疲劳强化、硬化和断裂问题作些新的解释。

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Then, a logic computational diagram is constructed for calculating diametral growth by assuming fatigue cyclic softening, namely yield strength reduction as tubing fatigues.

再通过合理的假设，建立用于计算直径增长的计算机逻辑框图。

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