The Paton Welding Journal, 2012, №07



2012 №07 (04)

2012 №07 (06)

---

The Paton Welding Journal, 2012, #7, 19-23 pages  

IMPROVEMENT OF FATIGUE RESISTANCE OF WELDED JOINTS WITH ACCUMULATED DAMAGE UNDER MULTISTAGE AND BLOCK LOADING

V.V. KNYSH, S.A. SOLOVEJ and A.Z. KUZMENKO

E.O. Paton Electric Welding Institute, NASU, Kiev, Ukraine
 
 
Abstract
The paper gives results of fatigue tests of tee welded joints on steel 09G2S strengthened by the technology of high-frequency mechanical peening after accumulation of 50 % of fatigue damage under the impact of multistage and block loading with differing parameters before and after strengthening. It is established that utilisation of this technology allows increasing the level of stresses initially applied to such joints and extending their residual fatigue life.
 
 
Keywords: accumulation of fatigue damage, high-frequency mechanical peening, cyclic fatigue life, fatigue, welded joint
 
 
Received:                20.03.12
Published:               28.07.12
 
 
References
1. Troshchenko, V.T., Sosnovsky, L.A. (1987) Fatigue resistance of metals and alloys: Refer. Book. Pt 1. Kiev: Naukova Dumka.
2. Knysh, V.V., Kuzmenko, A.Z., Vojtenko, O.V. (2006) Increasing fatigue resistance of welded joints by high-frequency mechanical peening. The Paton Welding J., 1, 30-33.
3. Garf, E.F., Litvinenko, A.E., Smirnov, A.Kh. (2001) Assessment of fatigue life of tubular connections subjected to ultrasonic peening treatment. Ibid., 2, 12-15.
4. Knysh, V.V., Solovej, S.A., Kuzmenko, A.Z. (2011) Influence of preliminary cyclic loading on effectiveness of welded joint strengthening by high-frequency peening. Ibid., 10, 36-39.
5. Knysh, V.V., Solovej, S.A., Kuzmenko, A.Z. (2008) Accumulation of fatigue damage in tee welded joints of 09G2S steel in the initial condition and after strengthening by high-frequency mechanical peening. Ibid., 10, 10-15.
6. Knysh, V.V., Kuzmenko, O.Z., Solovej, S.O. (2009) Accumulation of fatigue damage in tee welded joints in as-welded state and after strengthening by high-frequency mechanical peening under block loading. Mashynoznavstvo, 9, 27-31.

---