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Titolo:
THE EFFECT OF RESIDUAL-STRESSES ON FATIGUE OF BUTT JOINTS
Autore:
NGUYEN TN; WAHAB MA;
Indirizzi:
UNIV ADELAIDE,DEPT ENGN MECH ADELAIDE SA AUSTRALIA
Titolo Testata:
Welding journal
fascicolo: 2, volume: 75, anno: 1996,
pagine: 55 - 61
SICI:
0043-2296(1996)75:2<55:TEOROF>2.0.ZU;2-8
Fonte:
ISI
Lingua:
ENG
Soggetto:
INTENSITY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
16
Recensione:
Indirizzi per estratti:
Citazione:
T.N. Nguyen e M.A. Wahab, "THE EFFECT OF RESIDUAL-STRESSES ON FATIGUE OF BUTT JOINTS", Welding journal, 75(2), 1996, pp. 55-61

Abstract

In this paper, a theoretical analysis of the effect of residual stresses on the fatigue behavior of welded butt joints was developed by using linear elastic fracture mechanics (LEFM), superposition principle and finite element approaches. Various configurations of residual stresses in welded butt joints were considered and corresponding residual stress intensity factors were calculated by using Bueckner's and Kanazawa's weight functions for an edge and a central through-thickness crack in finite plate, respectively. Newman-Raju's empirical equation was also used for surface cracks. Fatigue life of butt joint welds subjected to various stress-induced treatments was calculated by using Paris's law with the effective range of stress intensity factor for zero-to-tensile loading (R = 0) and compared with the available experimental data. Compressive residual stresses introduced on the surface of the welded joints by various surface treatments, such as single- and multiple-point hammer peening, steel shot peening, glass peening, stress peening (loaded and peened) and tensile preloading, improved fatigue life and fatigue strength of welded butt joints. The improvemnt of fatigue life is due to the early state of crack propagation with the size of crack length not exceeding the depth of the compressive residual stressfield. It was also found that the effect of a low level of compressive residual stress (less than 62 MPa) in terms of the fatigue strength improvement is of the same order as the effect of a postweld thermal stress relieving process. The contribution of hardness of the treated material to the improvement of fatigue life is obvious at a high level of compressive residual stresses.

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Documento generato il 27/11/20 alle ore 22:30:03