On quadratic isoparametric transition elements for a crack normal to a bimaterial interface

The quadratic isoparametric crack-tip elements proposed by R. E. Abdi and G. Valentin (Computers and Structures 33, 241-248) are reconsidered and a simpler method for calculating the optimal position of the side nodes proposed. Quadratic isoparametric transition elements for an r(lambda-1) (0 < lambda < 1) strain singularity are formulated. The effects of these transition elements on the accuracy of the calculated stress intensity factors are shown numerically for a crack normal to and terminating at a bimaterial interface. Finally, layered transition elements are formulated for this case and their effects studied numerically. Copyright (C) 1999 John Wiley & Sons, Ltd.