Automatic Welding, 2018, №03



2018 №03 (02)

DOI of Article 10.15407/as2018.03.03

2018 №03 (04)

---

Avtomaticheskaya Svarka (Automatic Welding), № 3, 2018, pp. 18-22

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

V. A. Degtyarev

G.S. Pisarenko Institute for Problems of Strength. 2 Timiryazevskaya Str., Kyiv, 01014. E-mail:ips@ipp.kiev.ua

 
A work proposes a comparative analysis of the diagrams of cycle limit stresses in welded joints of low carbon and low alloy steels of different strength under condition that they have the same level  of final 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 high mechanical properties have higher endurance limits in all investigated range of change of the limit final residual stresses. It was found that welded joints of stronger steels have also higher values of endurance limit at the same relative value of average cycle stress. They rise more intensively with increase of the relative values of cycle average stress. 10 Ref. , 2 Tabl., 5 Fig.
 
Keywords: welded joint, cycle stress amplitude, average cycle stress, yield limit, final residual stress, endurance limit, diagram of cycle limit stresses
References

1. Knysh, V.V. Solovej, S.A. (2017) Improvement of service life of welded joints with fatigue damages. Kiev, KPI [in Russian].
2. (2014) Steel structures. Design standards DBN V.2.6.-198 [in Russian].
3. Degtyarev, V.A. (2016) Prediction of limiting amplitudes of cycle stresses of welded joints with steady residual stresses. The Paton Welding J., 10, 14-19. https://doi.org/10.15407/tpwj2016.10.03
4. Trufyakov, V.I. (1973) Fatigue of welded joints. Kiev, Naukova Dumka [in Russian].
5. Troshchenko, V.T., Tsybanev, G.V., Gryaznov, B.A., Nalimov, Yu.S. (2009) Strength of materials and structures. Fatigue of metals. Influence of surface state and contact interaction. Kiev, IPS, Vol. 2 [in Russian].
6. Krizhanovsky, V.I., Kasperskaya, V.V., Pogrebnyak, A.D. (2008) Evaluation of limit state of structural steels under asymmetric multicycle loading by tension, compression, bending and torsion. Problemy Prochnosti, 5, 81-88 [in Russian].
7. Golub, V.P. (2001) Experimental analysis of high-temperature creep, fatigue and damage. 1: Analysis methods. Appl. Mech., 37, 4, 425-455.
8. Pavlov, V.F., Kirpichyov, V.A., Ivanov, V.B. (2008) Residual stresses and fatigue resistance of strengthened parts with stress concentrators. Samara, OOO Izd-vo SNTs [in Russian].
9. Myunze, V.Kh. (1968) Fatigue strength of welded steel structures. Moscow, Mashinostroenie [in Russian].
10. Oding, I.L. (1962) Acceptable stresses in machine-building and cyclic strength of metals. Moscow, Mashgiz [in Russian].