基于结构整体性评估程序和失效评定图方法的含裂纹缺陷钢轨安全性评定

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英文篇名：Safety Assessments of Rails with Crack Defects Based on SINTAP-FAD Method 作者：于辉 ; 邹海贝 ; 李伟 ; 翟建伟 ; 刘利刚 英文作者：YU Hui;ZOU Haibei;LI Wei;ZHAI Jianwei;LIU Ligang;School of Mechanical Engineering,Yanshan University;National Engineering Research Center for Equipment and Technology of Cold Strip Rolling,Yanshan University; 关键词：钢轨 ; 裂纹缺陷 ; 结构整体性评估程序 ; 失效评定图 ; 有限元仿真 ; 安全性评定 英文关键词：rail;;crack defect;;structural integrity assessment procedure(SINTAP);;failure assessment diagram(FAD);;finite element simulation;;security assessment 中文刊名：ZGJX 英文刊名：China Mechanical Engineering 机构：燕山大学机械工程学院;燕山大学国家冷轧板带装备及工艺工程技术研究中心; 出版日期：2019-02-10 出版单位：中国机械工程 年：2019 期：v.30;No.507 基金：河北省自然科学基金资助项目(E2016203217);; 河北省军民融合专项 语种：中文; 页：ZGJX201903005 页数：8 CN：03 ISSN：42-1294/TH 分类号：23-30

摘要

为了研究不同工作状态下不同尺寸裂纹的扩展临界条件,通过实验得到了安全性评估过程需要的力学参数和断裂力学参量,采用相互作用积分法计算轮轨接触时含表面裂纹钢轨的裂纹尖端应力强度因子,并通过计算有效净截面应力得到参考应力。采用结构整体性评估程序和失效评定图(SINTAP-FAD)方法,根据0级失效评定曲线对含表面裂纹缺陷钢轨分别在车轮静止状态下与运动状态下进行了安全性评定。结果表明:车速对钢轨表面裂纹状态的影响较大,与车轮静止状态时评价点位于安全区的情况相比,列车运动时的评价点多向不安全区域发展,并造成了裂纹扩展。
        In order to study the critical conditions of crack growth with different scales under different worked conditions,mechanics parameters and fracture mechanics parameters needed in safety assessment processes were obtained by experiments.Interaction integral method was adopted to calculate the stress intensity factors of crack tips on the rails with surface crack defects in the wheel-rail contacts,and the reference stresses were obtained by calculated effective net section stresses.According to 0 level of failure assessment curves,SINTAP-FAD method was adopted to evaluate the safety of rails with surface crack defects under the conditions of wheel stationary states and moving states respectively.The results show that the train speed has a great influence on the surface crack state of the rails.Compared with the situations that the evaluation points located in the safety zone when wheels are in stationary states,the evaluation points develop towards the unsafety zone under the conditions of moving states and result in crack propagation.

引文

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