PSI - Issue 28

Lucie Malikova et al. / Procedia Structural Integrity 28 (2020) 403–410 Lucie Malikova et al. / Structural Integrity Procedia 00 (2019) 000–000

409

7

a) r c = 0.1 mm

b) r c = 0.5 mm

c) r c = 1.0 mm

d) r c = 1.5 mm

Fig. 5. Dependence of the crack deflection angle  on the crack inclination angle  for the crack length of 25 mm: experimental results (dashed line) and numerical results (multi-parameter SED criterion with various numbers of the initial terms of the WE) considering the critical distance r c a) 0.1 mm, b) 0.5 mm, c) 1.0 mm and d) 1.5 mm. 5. Conclusions Fracture behaviour of a crack in a semi-circular disc made of a novel environment-friendly AAC material has been investigated. Mixed-mode loading conditions were applied via crack inclination during three-point bending test. Crack deflection angle has been investigated under several levels of the mixed mode experimentally as well as numerically. A generalized form of the SED criterion was applied and influence of the selected number of the initial terms of the WE as well as of the selected critical distance was investigated and discussed. Based on the results presented, the multi-parameter fracture criterion can be recommended for configurations, where the loading mode II stress intensity factor is at least of the same order as the loading mode I stress intensity factor. It was also proved that multi-parameter fracture mechanics approach is important when fracture response of materials with rougher microstructure was assessed. Acknowledgements Financial support from the Czech Science Foundation (project No. 18-12289Y) and from the Faculty of Civil Engineering, Brno University of Technology (project No. FAST-S-20-5896) is gratefully acknowledged. References

Aliha, M.R., Ayatollahi, M.R., Kharazi, B., 2009. Mode II brittle fracture assessment using ASFPB specimen. International Journal of Fracture 159(2), 241–246.