Pulling Apart a Press-Fitted Joint

Abstract

Many locking devices consist of a rigid plug inserted into an annular cylindrical, rod-like body. In this paper, a one-dimensional model is developed for the resulting press-fit. This model assumes that the body is non-linearly elastic and is used to examine the mechanism by which the plug can be pulled from the rod-like body. Specifically, we find that this mechanism depends on a delicate balance between the pulling force, the deformed state of the rod-like body, and the friction holding the joint together. The application of the one-dimensional model to related problems involving press-fits is also discussed.

Modeling MEMS resonators with rod-like components accounting for anisotropy, temperature, and strain dependencies

“…The derivation of the governing equations of the axial deformation is similar to that given in Kinkaid and OÕReilly (2002) except the current model includes anisotropy and thermal effects. For each rod in the axial deformation model, we use the free-energy function (19) with finite strain measures and the material constants developed in Section 3.1.…”

“…As in Kinkaid and OÕReilly (2002), for each rod we assume an axial extension with cross-sections perpendicular to C remaining perpendicular. Thus, the motion of rod i is …”

“…After following a procedure similar to the one found in Kinkaid and OÕReilly (2002), the differential equations governing the steady state axial deformation of each rod are Fig. 7.…”