【摘要】 F汽车进口后在索赔期内仅运行2800km,其方向机突然失灵,车与杨树相撞。在事故技术检查中发现方向机驱动轴破断。那么,该驱动轴是在车、树相撞中破断,还是在相撞前破断呢?本文对F汽车方向机驱动轴的破断进行了疲劳与断裂分析,其中有联接分析、受力分析、断口(宏观、微观和金相)分析,从而得出该件原为不合格件,断口为疲劳断口,是正常疲劳断裂的结论。致使索赔汽车谈判成功。更多还原

【Abstract】 After the F automobile was imported, within the period of claiming damage, its steering installation failed to be controlled studdenly, the automobile knocked into a poplar tree while it has only been driven for 2800 kilometers. During the technical check of the accident, we found that its transmission shaft cracked. When was it happened? The authors made the technical judgement and analysis of the fatigue and fracture of the steering installation’s transmission shaft of the automobile, including joining analysis, loading analysis and (macrocosmic, microcosmic and metallographic) analysis of cracking section. Thus we obtained conclusion that the part was a unqualified one, the section was fatigue and the crack was normal fatigue fracture. So it resulted in the success of claiming negotiation for the automobile.更多还原