Issue34

S. Henkel et alii, Frattura ed Integrità Strutturale, 34 (2015) 466-475; DOI: 10.3221/IGF-ESIS.34.52 473 Figure 9 : Crack path for the 45° turned notch and loading directions. After changing to 90° phase shift the two crack tips branched into four crack tips. Two of them (marked as upper crack long and lower crack long) propagate faster than the other. Figure 10 : Crack length a versus number of cycles for the crack tips. Measurements were carried out with crack gage before and with camera system and after branching.