Shrink fit is a basic and simple technique for joining metal elements. But it is not suitable for ceramic and metal elements, especially at elevated temperatures. For the accurate estimation of fitting strength between ceramic and metal elements, an understanding of the deformation of surface micro-asperities during contact is introduced in this paper. The elastic deformation of a shaft and a cylinder and the elastic-plastic deformation of the asperities were taken into consideration for the theoretical fitting strength. Theoretical estimations of fitting strength between a ceramic shaft and a metal cylinder showed good agreement wtih experimental values in various fitting interferences and at temperatures of 20°C–180°C.

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