PSI - Issue 60

362 8

A.B. Penurkar et al. / Procedia Structural Integrity 60 (2024) 355–363 A. B. Penurkar/ StructuralIntegrity Procedia 00 (2023) 000 – 000

0 0.2 0.4 0.6 0.8 1 1.2

0 0.2 0.4 0.6 0.8 1 1.2 20 30 40 50 60 70 Probability of fracture Fracture stress (MPa) Experimental data Weibull model

Experimental data Weibull model

Probability of fracture

20

30

40

50

Fracture stress (MPa)

(a) (b) Fig. 9: Comparison of probability of failure using Weibull model and experimental data for thickness of (a) 4 mm (b) 8 mm.

Comparison of probability of fracture for 4 mm and 8 mm thickness of glass is shown in Fig. 10. The median failure probability line is drawn parallel to 63.2% failure probability. It cuts the distribution line at 40 MPa and 46 MPa respectively. Here also, it was observed that the probability of failure of higher thickness glass (8 mm) is more as compared to that of low thickness (4 mm). The reason is discussed in details in previous sections.

1.00

0.80

Specimen thickness

63.2% failure probability

0.60

4 mm 8 mm

0.40

Probability of failure

0.20

0.00

20

30

40

50

60

Fracture Stress (MPa)

Fig. 10: Comparison of fracture stress for glass specimen of different thickness.

6. Conclusions In order to study the effect of specimen thickness on fracture stress and its scatter, several experiments have been conducted on two thickness of glass material (4 mm and 8 mm). Following conclusions can be drawn from the study.  There has been a lot of scatter in the fracture strength of the glass specimen which is attributed to the presence of micro crack on the surface of the glass specimen.