Modeling Contact in Abaqus

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I have simulated a 2D model in Abaqus which indicates 2 main part, first a sector that represent as wheel and, second a rectangular that represent rail. the wheel and rail are in contact and wheel should rotate and move from left to right. there is a vertical small crack in middle of the rail to studying the result of contact on fracture mechanics. my model has been completed, and in the 1/10 of total time good result has been achieved but after that the stress distribution is completely wrong and although the contact seems to exist, the stress is almost zero. Any guide, comment or advice would be appreciated. thank you

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