Pestisit Kullanımının Halk Sağlığı Etkileri

Abstract

Many structures and mechanical assemblies are held together by connections containing two friction surfaces in contact under the action of a constant clamping force. When the structure is vibrating the external load acting on the joint is a time-dependent moment about an axis normal to the contact surfaces. Friction joints of this type constitute a well-defined source of damping in vibrating structures. The joint is analyzed theoretically by means of principles analogous to those used in the Panovko model [1] of the axially loaded lap joint. Complete moment-rotation and energy loss characteristics are obtained. it is shown that the energy dissipated during cyclic loading depends on the peak-to-peak value of the dynamic part of the external moment but is independent of the mean moment. A measure of the efficiency of the joint in dissipating energy is defined, and a comparison drawn between the rotary (moment loaded) joint and linear (axially loaded) lap joints. © 1977.