PSI - Issue 46

Cong Tien Nguyen et al. / Procedia Structural Integrity 46 (2023) 80–86 Nguyen et al./ Structural Integrity Procedia 00 (2021) 000–000 where � � � � ��� � � is relative change of logarithm of fatigue crack growth rate, � � � � � � is the fatigue crack growth rate at stress intensity factor range of of plate with porosity level , � � � � � � � � is the fatigue crack growth rate at stress intensity factor range of of non-porous plate. 85 6

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(b)

(a) (b) Fig. 4. Variation of local porosities on plates with average porosity levels of (a) ϕ � ����� (b) ϕ � ������ , (c) ϕ � ���� , (d) ϕ � ������

(a) (b) Fig. 5. Predicted fatigue crack growth (a) ��� curves (b) ����� � curves for porous ceramic plates