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Wear is the process of material removal due to relative sliding of two loaded contacting surfaces.The most notable dry-wear model is Archard''s wear law, which deals with the wear volume on the case of a hard material sliding against a soft material. In this paper we will measure the wear volume deal with ball sliding on the surface of polyethylene cover using the wear theorem based on energy method that was produced by Xiangiun and M. E. Plesha in 1991. According to the above method , we known that the wear
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