| Summary: | Vibrations, occurring in the cutting process, have significant effect on the accuracy of machined parts. Approaches, based on simplified simulation of parts and units, doesn’t lead to reliable results in dynamic behavior simulation, because they suppose the ideal smoothness of contact surfaces. Detailed simulation of contact layer requires large computational costs and is difficult to perform for most of calculations in mechanical engineering. In this regard, an approach to model the contact layer as a third body with zero thickness, which parameters depends from many factors, particularly from contact pressure, is the most widespread. The experimental method based on the identification of the contact layer is considered in this paper, using the example of a free-fixed beam. The algorithm for determining the stiffness element in the contact layer is based on the sensitivity coefficients calculation. As verification of the method, a comparison was made with the theoretical stiffness model in the contact layer. It’s investigated rigidity function in the region, depending on the natural frequency of the specify with different tightening forces. The obtained data can be used to correctly model the contact layer for dynamic problems.
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