Issue 22

R. K. Bhagat et alii, Frattura ed Integrità Strutturale, 22 (2012) 5-11; DOI: 10.3221/IGF-ESIS.22.01 8 where cos 2 e L L     and sin 2 e WW     , where 1 e e L f W       is obtained from regression analysis of the experimental results as Singh and Gope [9], 2 3 4 1 1 2 3 4 5 e e e e e e e e e e L L L L L f a a a a a W W W W W                                    (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. K Coefficients a 1 a 2 a 3 a 4 a 5 1.0 2958.13 -12319.36 19224.87 -13324.242 3460.51 1.2 4537.08 18372.43 27972.43 -18972.07 4837.87 1.4 15558.09 -64654.20 100712.02 -69686.75 18072.87 1.6 25511.84 -105574.57 163730.04 -112775.23 29110.39 1.8 13629.04 -56212.08 87054.91 -59991.82 15522.33 2.0 42527.06 -175971.91 272858.97 -187899.41 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 observed that result of K I 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.