Journal of Applied Sciences1812-56541812-5662Asian Network for Scientific Information10.3923/jas.2005.253.256ShahQ.H.M. AzramM.H. Iliyas2200552Three Point Bend (3PB) bimaterial specimens of PMMA/PC were made by joining the two materials using friction welding. The specimens were tested and the crack initiation loads were recorded to evaluate the K_{IC} using ASTM standard E 1820-01. Stress field in the crack tip vicinity was studied using finite element analysis of the specimen model. Normal and shear stresses were recorded for a series of nodes ahead of the crack tip at (θ=0 ° ). SIF values were calculated using these stress values and it was found that the stresses at a certain distance lying outside the process zone provide a SIF value matching to that of experimental fracture toughness of the specimen under study. Based upon the experimental evidence and finite element analysis, a simple step by step procedure is proposed to calculate the fracture toughness of bimaterials for a complex stress field.]]>Dundurs, J.,1969Cook, T.S. and F. Erdogan,1972Atkinson, C., R.E. Smelser and J. Sanchez,1982Leslie, B.S., N. Travitzky and D. Ashkenazi,2000Jorge, B.S.,1998Shin, D.K. and J.J. Lee,2001Christina, B. and C. Persson,2001Jiang, F., K. Zhao and J. Sun,2003Bernd, L. and T. Schuller,2001Ikeda, T. and N. Miyazaki,1998Dollfer, J., W. Beckert, B. Lauke and K. Schneider,2000Zak, A.R. and M.L. Williams,1963Akisanya, A.R. and N.A. Fleck,1992