期刊
WELDING IN THE WORLD
卷 67, 期 7, 页码 1833-1852出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s40194-023-01524-4
关键词
Brazing process and parameters; Failure behavior; Fatigue strength assessment
In this study, induction-brazed, vacuum-brazed, and continuous furnace-brazed joints were used to assess the fatigue life. It was found that the local brazing geometry in conjunction with the surface condition had the most influence on the failure behavior and fatigue strength.
In the case of cyclically loaded brazed joints, especially in safety-relevant components like common rail systems for common rail direct fuel injection, it is necessary to reliably estimate the fatigue strength, considering the influence of different manufacturing processes, manufacturing parameters, and failure behavior. In this paper, induction-brazed, vacuum-brazed, and continuous furnace-brazed joints are used to develop a reliable approach to assess the fatigue life. Therefore, the specimens were characterized and tested under load control using constant amplitudes. It is found that the local brazing geometry in conjunction with the surface condition, which differs by different topography values and by the position and number of initial defects, have the most influence on the failure behavior and consequently on the fatigue strength. Irrespective of this, however, it is shown that the fatigue strength can be estimated sufficiently well even with a simplified finite element modeling that uses idealized fillet radii and by taking support effects into account.
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