Interference fit is widely used in mechanical connection.The common interference fit shape is cylindrical or conical

other shape interference fit like rectangle shape is rarely mentioned.So there is no formula or experience can be referred to.The rectangle shape interference fit is researched by numerical simulation method

and the connection strength problem is analyzed based on thermalsolid theory when the parts working under thermal changing condition.The 3Dassembly model is built and the numerical simulation model is built by finite element method.The rectangular interference fit is mainly researched under different interference value.And then the interference fit relationship under thermal change is analyzed based on thermal-solid theory.The method can be referred on the problem of non-cylindrical or non-conical shape interference fit.