840D车轮辐板孔裂纹成因的强度及疲劳分析

采用大型通用商业分析软件Abaqus及Ansys,计算840D车轮在典型工况下的应力分布。计算分析表明:在坡道制动、机械载荷和停车制动3种典型工况作用下车轮辐板孔外侧处于受压状态,内侧处于受拉状态,而且应力幅值较大,是疲劳薄弱点;坡道制动工况与机械载荷工况的组合作用,是车轮辐板孔边产生高应力的主要因素;在相同制动工况下,车轮辐板孔边应力随着轮辋厚度的减小而增大,随着辐板孔向轮辋偏移量增大而增大;机械载荷工况与坡道制动工况的组合作用是导致各种车轮辐板孔疲劳裂纹萌生的主要原因;机械载荷工况与停车制动工况的组合作用对车轮辐板孔边萌生疲劳裂纹的影响相对较小。

Strength and Fatigue Analysis on Crack Initiation of 840D Wheel Plate Hole

Stress distribution state of 840D wheel under 3 typical load cases(long duration braking load case,mechanical load case and parking braking load case),are analyzed with Abaqus and Ansys software.The results show that the outer side of 840D wheel plate hole is under compression,but the inner side is under tension and the amplitude of stress is higher.So the latter is the vulnerable point of fatigue.Additionally,long duration braking load case combined with mechanical load case is the main reason of high stress which will be increased as the rim gets thicker or the plate hole more offset to the rim.Furthermore,the combined load case above is absolutely necessary for fatigue crack initiation of all wheels analyzed,and parking braking load case combined with mechanical load case have relatively less effect on fatigue crack initiation at the rim of wheel plate hole.