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论述了疲劳问题的重要性和疲劳破坏现象，以及影响疲劳试验结果的主要因素，包括材料的化学成份、热处理、试件大小、表面粗糙度、应力状态等等。
The importance of fatigue problems and fatigue failure are discussed, and the main factors affecting the fatigue test results include the chemical composition, heat treatment, specimen size, surface roughness, stress state and so on.