Fatigue strength of brazed components considering the influence of brazing quality, mean stresses and loading type

Safety-related brazed compounds, e.g. rails for a direct fuel injection or heat exchangers, are exposed to complex cyclic loads. These loads can lead to a fatigue of the brazed components. The fatigue behavior depends on various factors like the quality on one side and the loading (mean stresses, loading type) on the other. From an analysis of real components, peel and shear test specimens were derived and tested under load control, using constant and variable amplitude loading. A fatigue life assessment is performed in order to describe the complex in-service life of these joints.