Fatigue crack development in a low-carbon steel. Microstructure influence. Modelling

被引：4

作者：

Angelova, Donka ^{[1
]}

Yordanova, Rozina ^{[1
]}

Yankova, Svetla ^{[1
]}

机构：

[1] Univ Chem Technol & Met, 8 St Kliment Ohridski Blvd, BU-1756 Sofia, Bulgaria

来源：

21ST EUROPEAN CONFERENCE ON FRACTURE, (ECF21) | 2016年 / 2卷

关键词：

Fatigue; Short-crack propagation; Microstructure; Low-carbon steel;

D O I：

10.1016/j.prostr.2016.06.340

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

Fatigue in a low-carbon steel with ferrite and pearlite microstructure is investigated through testing of three groups of specimens. Two of the groups consist of cylindrical specimens subjected to tension-tension and rotating-bending fatigue; in this case surface microstructurally-short crack propagation is monitored by acetate-foil replica technique. The third group of specimens includes flat specimens preliminary notched by FIB-technique and then subjected to pure-bending fatigue. The study is focused on examining of crack paths in terms of interaction between the propagating short cracks and the microstructure. The obtained data for pure-bending fatigue show higher crack growth rates and shorter fatigue lifetimes than those found for rotating-bending fatigue. In comparison, the registered tension-tension fatigue data present the lowest crack growth rates, due to much lesser loading than that applied at rotating-bending and pure-bending fatigue. Based on data obtained, a Parabolic-linear model "Crack growth rate - Crack length" is used for describing and predicting adequately short crack propagation under the specified three types of fatigue. The model is supported by a comparison between the predicted and the actual fatigue lifetimes. Copyright (C) 2016 The Authors. Published by Elsevier B.V.

引用

页码：2726 / 2733

页数：8

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