关键词:化工用压缩机;活塞杆;早期疲劳断裂;产生原因;防范对策 [gap=7227]Key words: Compressor Used in Chemistry Industry; Piston Shaft; Early Fatigue Rupture; Reason; Defend
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叉车货叉失效方式主要表现为塑性变形超差，脆性断裂和早期疲劳断裂。
Fork failure of a forklift truck mainly takes a form of plastic deformation exceeding allowable limit, fragile breakage and early stage fatigue breakage.
分析结果表明，该连杆螺栓早期疲劳断裂的原因是由于杆部与头部的过渡圆弧处产生的应力集中所导致的。
Analysis results indicate that the arc transition area between rod and head is easy to produce stress concentration, which results in earlier fatigue failure.
采用扫描电镜进行断口分析，结果表明，零件内弯处外表面上的冲压伤痕是导致其早期疲劳断裂的主要原因。
The fracture surface was inspected by SEM. The results showed that the stamping damage on the surface around the inside bend was the main factor to cause the early fracture.
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