满载运煤敞车超常低周疲劳刚柔耦合评估新方法

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振动与冲击 ›› 2024, Vol. 43 ›› Issue (22) : 70-80.

论文

满载运煤敞车超常低周疲劳刚柔耦合评估新方法

靳世英1，朴思扬*2，聂春戈2，张俊林3，李向伟3，朴明伟1

作者信息 +

Novel method for assessing extraordinary low-cycle fatigue of laden coal gondola cars using the rigid-flex coupling simulation technique

JIN Shiying1，PIAO Siyang*2，NIE Chunge2，ZHANG Junlin3，LI Xiangwei3，PIAO Mingwei1

Author information +

文章历史 +

摘要

备用传力路径变化不确定性使准静态应变能成为决定平面心盘旁承接口耦合程度的最重要影响因素之一，既有方法丧失了小位移线弹假设的应用前提。根据这一相关性发现，提出了刚柔耦合疲劳损伤评估新方法。为了攻克散料运输铁路货车刚柔耦合仿真难题，采用了实体单元及边界共节点处理技术。在正常AAR5级谱和局部扭曲叠加谱激励输入下满载运煤敞车刚柔耦合仿真分析表明：上旁承运行载荷增大迫使车体结构扭曲产生不高于2 Hz的低频敏感响应。钩缓冲击座附近焊缝疲劳损伤评估结果与现场塑性破坏完全吻合。由于局部刚度不足，短竖梁补强设计也很难奏效。借鉴通用敞车耳板铆接的设计经验，合理制订了具有针对性的结构补强方案，使满载运煤敞车不会再发生上述塑性破坏。

Abstract

The uncertainty of alternative load path variation makes the quasi-static strain energy become one of the most important factors determining the coupling extent on the interface of flat center plate and side-bearings, which deprives the existing methods of their application premise of small displacement and linear elasticity assumption. According to this finding of above-mentioned correlationship, a novel method for assessing fatigue damage was proposed using the rigid-flex coupling simulation technique. In order to overcome the difficult problem in rigid-flex coupling simulations of rail freight cars for bulk material transportation, the solid elements were adopted with boundary co-node transactions. Under the excitation inputs of both normal AAR5 spectrum and local twist superimposed spectrum, the analyses of rigid-flex coupling simulations for laden coal gondola car indicate that an increase in the operating loads of upper side-bearings makes the distortion of carbody structure produce a low-frequency sensitive response of no higher than 2 Hz. The fatigue damage assessment results of the welds around impact seat of hook and buffer are completely consistent with on-site plastic failure. Due to the insufficient local stiffness, the reinforced design of short vertical struts is also difficult to be effective. Drawing on the experience of riveting design for ear plates in general gondola cars, a targeted structural reinforced design was reasonably formulated to prevent the foregoing plastic damage from occurring again in laden coal gondola cars.

导出引用

靳世英1, 朴思扬2, 聂春戈2, 张俊林3, 李向伟3, 朴明伟1. 满载运煤敞车超常低周疲劳刚柔耦合评估新方法[J]. 振动与冲击, 2024, 43(22): 70-80

JIN Shiying1, PIAO Siyang2, NIE Chunge2, ZHANG Junlin3, LI Xiangwei3, PIAO Mingwei1. Novel method for assessing extraordinary low-cycle fatigue of laden coal gondola cars using the rigid-flex coupling simulation technique[J]. Journal of Vibration and Shock, 2024, 43(22): 70-80

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