PSI - Issue 13

Gustavo Henrique Bolognesi Donato et al. / Procedia Structural Integrity 13 (2018) 1879–1887 Gustavo H. B. Donato and Felipe C. Moreira / Structural Integrity Procedia 00 (2018) 000–000

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Considering C(T) and SE(B) specimens in Fig. 4, it can be realized that different dimensionless radius lead to different M values. For SE(T), on the other hand, except from very shallow cracks, effects of the dimensionless radius are less pronounced. Comparing the three geometries, one can realize that C(T) geometry presents much lower M values if compares to SE(B) or SE(T). In fact, compact specimens are recognized as high stress triaxiality geometries, which was confirmed. SE(B) specimens have M values slightly lower than SE(T), which means that SE(T) presents the lowest stress triaxiality of the three studied geometries, mainly because of the tensile loading mode. Evaluating now the effects of material properties (here represented by n = 5, 10 and 20 – Fig. 5), it could be realized that for C(T) geometries the effects of material properties on M are visible. For SE(B) and SE(T), it also occurs, but effect is only more pronounced for shallow cracks.

Fig. 5. Influence of a/W on M values for varying geometries. 3D models and n = 5, 10 and 20. The dashed region was expanded on the right..