The effects of periodic overloads on fatigue crack growth in a pearlitic Grade 900A steel used in railway applications

被引：34

作者：

Nejad, Reza Masoudi ^{[1
]}

机构：

[1] Univ Elect Sci & Technol China, Sch Mech & Elect Engn, Chengdu 611731, Peoples R China

来源：

ENGINEERING FAILURE ANALYSIS | 2020年 / 115卷

关键词：

Periodic overload; Fatigue life; Load ratio; Fatigue crack growth; Rail; ROLLING-CONTACT FATIGUE; LIFE PREDICTION; CRITICAL PLANE; COMPONENTS; PROPAGATION; WHEELS; MODEL;

D O I：

10.1016/j.engfailanal.2020.104687

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

The objective of this paper is to predict a three-dimensional fatigue crack growth (FCG) in a pearlitic Grade 900A steel used in railway applications in the presence of periodic overloads. Numerical and experimental methods are used to investigate the behavior of FCG in the rail specimens. A 3-D boundary element model, using the BES tool is used to estimate the stress intensity factor (SIF) using the crack opening displacement (COD) approach in rail specimens. Also, the crack growth rate is predicted utilizing the Forman-Newman-de Koning (FNK) model. Linear elastic fracture mechanics (LEFM) is used to predict the fatigue life developed from a two-stage fatigue loading cycle where both mechanical loads and periodic overloads are present. The maximum tangential stress (MTS) crack extension criterion is used to obtain the FCG paths. The results revealed that fatigue life is highly sensitive to periodic overloads. Therefore, this factor significantly affects the fatigue life of railway rails during service conditions. In the present investigation, the periodic overloads have remained constant and the effect of load ratio and the number of overloads on the fatigue life has been investigated.

引用

页数：10

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