结果表明，连杆属于疲劳断裂，断裂失效主要由折叠裂纹引起。
The results show that the fatigue fracture is the main cause of fracture failure for the connecting rod.
结果表明，断裂由连杆小头A截面的表面缺陷(折叠裂纹等)引起。
The result has shown that the fracture was caused by such surface defects as fold crack in section a at connecting rod small end.
结果表明，导致活塞销失效的主要原因是活塞销内表面在发动机装配使用前存在折叠裂纹。
The results indicate that the main reason causing the failure of the piston pin is fold cracks in inner-surface of the piston pins existing before that the engine is assembled and tested.
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