PSI - Issue 13

Atsuhisa Kitade et al. / Procedia Structural Integrity 13 (2018) 1845–1854 Author name / Structural Integrity Procedia 00 (2018) 000 – 000

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Fig.2 Configuration of specimen used

Fig.3 Representative appearance of test specimen after the test

(a)Make two notches in the specimen

(b)When load is applied, one notch surface breaks

(c)Fatigue cracking of surface that did not break

(d)Observe fractured surface caused by fatigue

Fig.4 Schematic diagram of identification of brittle fracture trigger point

Fig.5 SEM observation results of fracture surface

Next, it is polished from the upper surface until section just before the brittle fracture trigger point can be observed. Tagawa et al also used this method to directly observe the destruction trigger point [Tagawa et al, 2016].