Issue 22

R. K. Bhagat et alii, Frattura ed Integrità Strutturale, 22 (2012) 5-11; DOI: 10.3221/IGF-ESIS.22.01

where

L L 

 



cos

e

2

and

WW 

 



sin

,

e

2

e L f W       is obtained from regression analysis of the experimental results as Singh and Gope [9], 2 3 4 e

where

1

e L     e   W

3         e e L     L a  e e e   W W W W e   a a   4 5 e L     e L    

 

f

1 a a

(2)

1

2

The coefficients (a1 to a5) are shown in Tab. 2 for various biaxial load factors. The effective length and width are defined in Fig. 7.

Coefficients

K

a 1

a 2

a 3

a 4

a 5

1.0 1.2 1.4 1.6 1.8 2.0

2958.13 4537.08 15558.09 25511.84 13629.04 42527.06

-12319.36 18372.43 -64654.20 -105574.57 -56212.08 -175971.91

19224.87 27972.43 100712.02 163730.04 87054.91 272858.97

-13324.242 -18972.07 -69686.75 -112775.23 -59991.82 -187899.41

3460.51 4837.87 18072.87 29110.39 15522.33 48486.72

Table 2 : The coefficients of Eq. (2) [9].

Figure 7 : Effective length and effective width in the specimen.

The correlation coefficient in all cases are found to be greater than 0.90. The variation of K I with crack inclination angle (α) obtained by experimental method and FEM are shown in Fig. 8. It is obtained from finite element approach using commercial software ANSYS are very close to experimental results of Singh and Gope [9]. It means finite element modelling using ANSYS software can be used to determine stress intensity factor K I for any complex crack configurations too. observed that result of K I

8