On the railhead material damage of insulated rail joints: Is it by ratchetting or alternating plasticity?

被引：5
|
作者：
Mandal, Nirmal Kumar [1 ]
Spiryagin, Maksym [1 ]
Berg, Mats [2 ]
Stichel, Sebastian [2 ]
机构：
[1] Cent Queensland Univ, Ctr Railway Engn, Rockhampton, Qld 4702, Australia
[2] KTH Royal Inst Technol, Sch Engn Sci, Dept Aeronaut & Vehicle Engn, SE-10044 Stockholm, Sweden
来源：
INTERNATIONAL JOURNAL OF FATIGUE | 2019年 / 128卷
关键词：
FEA; Wheel/rail contact; Rail Joints; Fatigue damage; Endpost materials; CONTACT; FAILURE; WHEEL; BEHAVIOR; MODEL;
D O I：
10.1016/j.ijfatigue.2019.105197
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
Railhead becomes severely stressed due to localised contact loadings. This is more critical in the vicinity of endposts of an insulated rail joint. Popular IRJ endpost materials are fibreglass (fb), polytetrafluoroethylene (ptfe) and nylon66 (ny). A 3D finite element analysis is carried out to study stress distributions in railhead material near the endposts. The progressive damage parameter, von Mises stress and other residual stress and strain plots indicate that plastic deformation and material degradation occur at sub-surface levels of the railhead material. Although fb and ptfe are better endpost materials than ny, ny displays superior performance over the other two.
引用
收藏
页数：12
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