The Paton Welding Journal, 2018, №03



2018 №03 (02)

DOI of Article 10.15407/tpwj2018.03.03

2018 №03 (04)

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The Paton Welding Journal, 2018, #3, 16-19 pages
 

Fatigue resistance of steel welded joints of different strength with steady residual stresses

V.A. Degtyarev

G.S. Pisarenko Institute for Problems of Strength of the NAS of Ukraine 2 Timiryazevskaya Str., 01014, Kyiv, Ukraine. E-mail: ips@ipp.kiev.ua
 
Abstract
A work proposes a comparative analysis of the diagrams of cycle limiting stresses in welded joints of low-carbon and low-alloy steels of different strength under condition that they have the same level of steady residual stresses. By the example of testing of St3sp (killed), 09G2S and 14KhMNDFR steel butt welded joints it is shown that the welded joints with larger mechanical properties have higher endurance limits in all investigated range of change of the limiting steady residual stresses. It was found that the welded joints of stronger steels have also higher values of endurance limit at the same relative value of cycle average stress. They rise more intensively with increase of the relative values of cycle average stress. 10 Ref., 2 Tables, 5 Figures.
Keywords: welded joint, cycle stress amplitude, cycle average stress, yield limit, steady residual stress, endurance limit, diagram of cycle limiting stresses
 
Received: 23.01.18
Published: 12.04.18
 
 
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