1208 レール頭部における短いき裂進展と摩耗の競合シミュレーション(OS12. 破壊力学とき裂の解析・き裂進展シミュレーション(2),オーガナイズドセッション講演)

概要

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In this study. numerical models have been developed to simulate the competition between short crack propagation and wear in rail head. The locations of crack initiation are given by a random generator in the pro-eutectoid ferrite at the beginning of the simulation. The crack is assumed to initiate when the total accumulated plastic shear strain in the region reaches the critical shear strain value. The growth of Stage I short crack occurs along the ferrite and pearlite boundaries. If the crack becomes long enough to open its faces, Stage II short crack growth is assumed to occur. In these crack growth simulations, Hobson law is applied. With regard to wear, the Archard model is adopted as the basis. The wear depth can be calculated from the normal pressure distribution in the wheel-rail contact region, the sliding distance etc.
2010-09-23