Experimental and Numerical Investigation on the Effect of form Defects in Contact Surface of Interference Fit Joints on the Strength of Joint

Interference fitting widely uses in industry. These joints manufacturing are always associated with limitations and high precision. To reduce manufacturing costs, it is essential to study the influence of form defects on the assembly strength. Standards are limited to simple cylindrical parts. But, variation in interference are common in manufacturing process of these parts. In this article, it has been tried to predict strength of interference joints successfully, by proposing of new definition of mean interference for parts with form defects. Then, strength of interference joints were calculated using traditional Lame approach and mean interference value. Also, real model of interference fit with form defects were analyzed by finite element method. Theoretical results were compared with experimental results for validation. Theoretical results correlate well with those obtained through experiments. Results show that for defected interference fit joints, mean interference can be considered as reliable criterion for evaluation of joint strength.