An algorithm to extend FASTSIM for non-Hertzian contact

The Simple Double-Elliptic Contact (SDEC) shape was proposed as an approximation of a wide variety of non-elliptic patches considering that the contact area formed between the rail and wheel can be far from elliptic in many practical cases. In this paper, the classic FASTSIM is first extended to the SDEC regions and then further extended to cover any general non-elliptic contact areas for the evaluation of creep forces and the prediction of wheel wear. Comparative studies show that the proposed model is as fast as the original FASTSIM and provides more accurate solutions than existing models for the same purposes.