scholarly journals High‐strength steel wires containing corrosion pits: stress analysis and critical distance based fatigue life estimation

2019 ◽  
Vol 43 (8) ◽  
pp. 1611-1629 ◽  
Author(s):  
Z. Jie ◽  
L. Susmel
Keyword(s):  
Fatigue Life ◽  
Stress Analysis ◽  
High Strength Steel ◽  
High Strength ◽  
Critical Distance ◽  
Life Estimation ◽  
Steel Wires ◽  
Fatigue Life Estimation ◽  
Corrosion Pits

1414 Fretting fatigue life estimation based on the critical distance stress theory

2010 ◽  
Vol 2010 (0) ◽  
pp. 670-671
Author(s):  
Toshio HATTORI ◽  
Youichi YAMASHITA ◽  
Vu Tning KIEN ◽  
Minoru YAMASHITA
Keyword(s):  
Fatigue Life ◽  
Fretting Fatigue ◽  
Critical Distance ◽  
Stress Theory ◽  
Life Estimation ◽  
Fatigue Life Estimation

Effect of the galvanization process on the fatigue life of high strength steel compression springs

2021 ◽  
Vol 63 (3) ◽  
pp. 226-230
Author(s):  
Fatih Özen ◽  
Ahmet İlhan ◽  
Hakkı Taner Sezan ◽  
Erdinç İlhan ◽  
Salim Aslanlar
Keyword(s):  
Fatigue Life ◽  
Hydrogen Embrittlement ◽  
High Strength Steel ◽  
Reaction Force ◽  
Fatigue Crack Initiation ◽  
High Strength ◽  
Steel Wires ◽  
Compression Spring ◽  
Spring Wire ◽  
Compression Springs

Abstract In this study, a compression spring fatigue problem arising from the galvanization process was investigated. Fatigue, crack initiation and growth of galvanized and non-galvanized springs manufactured from fully pearlitic high strength steel wires were investigated. According to the results, the galvanized compression springs exhibited a low fatigue life due to hydrogen embrittlement. Hydrogen embrittlement induced crack initiations formed under the galvanizing layer and adversely affect fatigue life. It was observed that local embrittlement on the outer surface of the spring wire causes crack initiations and disperses through the pearlitic interlamellar microstructure. Compared to non-galvanized and shot-peened specimens with the same surface roughness, compression springs, galvanized compression springs exhibited a 25 % reaction force loss at 50 000 cycles.

scholarly journals Numerical fatigue life estimation of aluminium 6201-T81 wires containing geometric discontinuities.

2018 ◽  
Vol 165 ◽  
pp. 10015
Author(s):  
Jesús Martínez ◽  
Vitor Adriano ◽  
José Araújo ◽  
Jorge Ferreira ◽  
Cosme da Silva
Keyword(s):  
Experimental Study ◽  
Fatigue Life ◽  
Numerical Approach ◽  
Critical Distance ◽  
Partial Slip ◽  
Life Estimation ◽  
Slip Regime ◽  
Fatigue Life Estimation ◽  
Geometric Discontinuities ◽  
Through Hole

Previous works have shown that fretting fatigue can be modelled as a notch problem due to the mild superficial damage produced in the partial slip regime during fretting. In this context, the aim of this numerical and experimental study is to estimate the fatigue life of aluminium 6201-T81 wires, used in overhead conductors, containing geometric discontinuities. These discontinuities induce a stress field analogous to the fretting problem. To perform the fatigue life assessments the LM-Nf relationship, which is an extension of the Theory of Critical Distance (TCD), was applied. The LM-Nf relationship was calibrated using two S-N curves, one of a plain wire and other of a notched wire. The validation of the numerical approach estimations was performed using a wire containing a through hole. The estimations were fallen almost entirely among factor 3 bands when compared with the experimental results. This factor 3 represents the biggest scatter in the S-N curves used to calibrate the LM-Nf relation. The TCD approach applied, in terms of point method, provide accurate life estimations in the range 105 and 106 cycles.

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