LZ50车轴钢疲劳短裂纹萌生的数值模拟 Simulation for Short Fatigue Cracks Initiation of LZ50 Axle

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LZ50车轴钢疲劳短裂纹萌生的数值模拟

Simulation for Short Fatigue Cracks Initiation of LZ50 Axle Steel for Railway Vehicles

针对LZ50车轴钢的疲劳短裂纹应用数值方法对疲劳短裂纹在LZ50车轴钢中的萌生进行了数值模拟.利用二维Voronoi图随机地生成了该材料的微观结构.根据对疲劳试样所施加的载荷,结合有限元法得到了该微观结构中应力和应变的分布规律.最后利用材料的疲劳S-N曲线和裂纹萌生的概率方法给出了在不同循环周次下LZ50钢中疲劳短裂纹的萌生过程.该数值模拟的结果可用于进一步分析LZ50车轴钢中疲劳短裂纹的扩展和群体演化行为.文中还指出在单向拉压的工况下,短裂纹的萌生方向主要受到与载荷方向相一致的应变影响,最大剪应变方向萌生方向的夹角为45°.

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作 者: 徐延海 赵永翔 Xu Yanhai Zhao Yongxiang  
作者单位:徐延海,Xu Yanhai(西华大学,610039,成都)水利论文%mIy)JJT
赵永翔,Zhao Yongxiang(西南交通大学牵引动力国家重点实验室,610031,成都) 
刊 名:应用力学学报  ISTIC PKU
英文刊名:CHINESE JOURNAL OF APPLIED MECHANICS 
年,卷(期):2009 26(3) 
分类号:TH123+3 O346.2 
关键词:疲劳短裂纹   裂纹萌生   数值模拟   LZ50车轴钢  
机标关键词:车轴钢疲劳短裂纹裂纹萌生数值模拟Railway VehiclesFatigue Cracks微观结构最大剪应变应力和应变材料的疲劳Voronoi图载荷方向有限元法演化行为数值方法概率方法分布规律S-N曲线循环随机 
基金项目: 
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