Journal of Applied Sciences1812-56541812-5662Asian Network for Scientific Information10.3923/jas.2005.476.481ShahQ.H.HommaH.IliyasM.H.IsmailA.F.3200553Fracture toughness tests on CT specimens were carried out to study the fracture behavior for a crack lying perpendicular to the interface in a PMMA/PC bimaterial. Polymethylmethacrylate Acrylic (PMMA) and Polycarbonate (PC) cylindrical rods were joined together using the friction welding process. CT specimens were machined out of the bimaterial cylindrical rods. A sharp crack was introduced into the specimen perpendicular to and terminating at the bimaterial interface. Specimens including monolithic and bimaterial were loaded to fracture and experimental values of K_{IC} were obtained. Finite element analysis was used to find out the stresses in the specimens. Subsequently the stress values were used to find out the fracture toughness of each specimen. It was found that the K_{IC} values for bimaterial specimen could not be achieved by utilizing the inverse square root singularity in stress but it was dependent upon Dundurs parameters for bimaterials.]]>Kolednik, O.,2000Kim, A.S., J. Besson and A. Pineau,1999Marur, P.R. and H.V. Tippur,2000Chang, J.H. and D.J. Wu,2003Simha, N.K., F.D. Fischer and O. Kolednik,2003Jiang, F., Z.L. Deng, K. Zhao and J. Sun,2003Shah, Q.H. and H. Homma,1995Li, C. and Z. Zou,1998Lahiri, S., B.V. Sankar and P.A. Mataga,1996Kang, Y. and L. Hua,2002Chen, S.H., T.C. Wang and S. Kao-Walter,2003Alberto, R. and R. Ballarini,1997Cook, T.S. and F. Erdogan,1972Zak, A.R. and M.L. Williams,1963Wang, T.C. and P. Stahle,1998