Issue 53

L. Hadid et alii, Frattura ed Integrità Strutturale, 53 (2020) 1-12; DOI: 10.3221/IGF-ESIS.53.01

level and the distribution of stresses is carried out. The so obtained results are illustrated in Fig. 12. This last one shows the variation of Von Mises and normal stresses according to the distance separating the sites from two defects.

0,0 0,2 0,4 0,6 0,8 1,0 40 50 60 70 80 90 (a) Ceramic x/y =2 x/y =4 x/y =6

-70 -60 -50 -40 -30 -20 -10 0 10 -70 -60 -50 -40 -30 -20 -10 0 10

(b)

S equi (MPa)

x/y =2 x/y =4 x/y =6

S XX (MPa)

Interface

Ceramic/Defect

0.0 0.2 0.4 0.6 0.8 1.0

Normalize Distance

Normalize Distance Normalized distance

r alized distance

10 20 30 40 50 60 70

(c)

(d)

x/y =2 x/y =4 x/y =6

x/y =2 x/y =4 x/y =6

S ZZ (MPa)

S YY (MPa)

-10 0

0.0 0.2 0.4 0.6 0.8 1.0

0.0 0.2 0.4 0.6 0.8 1.0

Normalize Distance Normalized distance

Normalized distance

Normalize Distance

Figure 10: Variation of equivalent and normal stresses according to defect geometry in ceramic.

1.5 2.5 Stress Concentration Factor (K t ) Ratio x/y 2.0

2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 1.0

Figure 11: Variation of stress concentration factor according to defect geometry.

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