Issue 73

H. S. Vishwanatha et alii, Fracture and Structural Integrity, 73 (2025) 23-40; DOI: 10.3221/IGF-ESIS.73.03

specimens show ductile characteristics, whereas larger specimens display more brittle behavior. Consequently, LEFM is better suited for designing larger specimens, while the strength criterion is more appropriate for smaller ones.

For all beam

For beam size 250mm, 500mm and 1000mm

Parameter

Experimental

Present study

Experimental

Present study

SSA 0.877 2.274 323.2 62.32 62.66 2.97

RSA 0.877 2.274 324.1 62.59 62.73 3.54

SSA 0.877 2.274

RSA 0.877 2.274

k 0 k' 0

0.877 2.274 283.1

0.877 2.274 466.3

425 2.72 82.0 69.0

- - - -

0 (mm)

3.16 54.6 59.2

3.00 89.9 73.8

(MPa)

(mm

B f G (N/m)

Table 6: Size effect parameters and fracture properties from size effect analysis.

SSA model

A D 0

1

D (mm)

P Max (kN)

 N (Mpa)

Beam ID

C

   N 0.1313 0.1567 0.2120 0.3020 0.4553

2

B-SB75 B-MB150 B-LB250 B-VB500 B-HB1000 B-SB75 B-MB150 B-LB250 B-VB500

75

6.9

2.76 2.526 2.172 1.8198

150 250 500

12.63 18.1 30.33

323

2.97

0.113

0.00035

1000

49.4

1.482

RSA model

75

7.33 13.73

2.932 2.746 2.16 1.8144

0.1163 0.1326 0.2143

150 250 500

18

237

3.33

0.090 0.3038 Table 7: Parameters for bi-logarithmic plotting (Fig. 16). 30.24

0.00038

(a) SSA

37