Study on defect tolerance size of welded joint for high speed train bogie frame based on fracture mechanics

LI Zhongwen

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Study on defect tolerance size of welded joint for high speed train bogie frame based on fracture mechanics
Vol. 48, Issue 3, Pages: 150-152(2018)
Published：2018
DOI：
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DOI：

LI Zhongwen. Study on defect tolerance size of welded joint for high speed train bogie frame based on fracture mechanics[J]. Eletric Welding Machine2018, 48(3): 150-152. DOI：

摘要

针对高速列车转向架焊接构架存在的表面线性缺陷和根部连续缺陷

基于断裂力学理论

采用结构设计规范中的工程计算方法获得不同缺陷深度的应力场强度因子

结合构架接头材料的特性

进一步得到不同应力水平下的缺陷容限尺寸。焊缝表面线性缺陷和根部连续缺陷的前缘

应力场强度因子随着缺陷深度或应力的增加而增加;焊缝表面线性缺陷的深宽比a/c越小

应力场强度因子越大;随着应力水平的增加

缺陷容许尺寸明显降低。

Abstract

Correlation of stress intensity factor and defect size for welded joints of high-speed train bogie frame was analyzed and calculated by means of fracture mechanics principle for surface linear defect and root continuity defect. More specific results were thus provided on allowable defect size under different stress range based on material properties of welded joint. Results show that stress intensity factor of crack tip increased with flaw depth and stress range

but decreased with the ration of depth and semi-length.Furthermore

flaw tolerance depth was significantly reduced with the increase of stress level.