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首页> 外文会议>ASME/IEEE/ASCE joint rail conference 2008 : Mechanical and civil engineering papers ; Electrical engineering papers >EFFECT OF BOLT STRENGTH AND LOADING CONDITIONS ON A 7/8' BOLT WITHIN AN END-OF-CAR ARRANGEMENT
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EFFECT OF BOLT STRENGTH AND LOADING CONDITIONS ON A 7/8' BOLT WITHIN AN END-OF-CAR ARRANGEMENT

机译：螺栓强度和载荷条件对汽车尾部布置内的7/8“螺栓的影响

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摘要

A cause of failure within end-of-car (EOC) arrangements for cushioned cars with F-shank couplers is that of the yoke bolt failing in shear. This mode of EOC failure is of particular concern due to the concealed nature of the bolt not easily allowing for early detection of the onset of failure. To this end, a finite element analysis (FEA) was performed on a 7/8" bolt and F-bracket assembly to determine the stress state developed within the bolt in an effort to understand the potential cause or causes for the bolt failure. Several parameters, including bolt strength, bolt preload (initial torque), and external loading were varied to determine their effects on bolt performance. The subsequent results indicate that both inherent strength and initial preload have a significant effect on whether a bolt can effectively withstand the various external loading conditions encountered in the field. In addition, it is also apparent that some of the simulation loading scenarios analyzed contain the potential to initiate bolt shearing during operation. From these results, some failure mechanism theories are proposed to describe the type of failure encountered by each bolt grade, either ductile or brittle depending on the inherent material properties.
机译：带F轴联轴器的减震汽车的车尾（EOC）布置中的故障原因是轭螺栓剪切失败。由于螺栓的隐蔽特性，不容易允许及早发现故障的发生，因此这种EOC故障模式尤其值得关注。为此，对7/8“螺栓和F形支架组件进行了有限元分析（FEA），以确定螺栓内部产生的应力状态，从而了解螺栓失效的潜在原因。通过改变包括螺栓强度，螺栓预紧力（初始扭矩）和外部载荷等参数来确定它们对螺栓性能的影响，随后的结果表明，固有强度和初始预紧力均对螺栓能否有效承受各种变化有重要影响。此外，很明显，所分析的某些模拟载荷场景具有在操作过程中引发螺栓剪切的潜力，从这些结果出发，提出了一些失效机理理论来描述所遇到的失效类型每种螺栓等级，取决于固有的材料特性，无论是韧性的还是脆性的。

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