Abstract
The work objective is to assess the compliance of a flat joint of fractal surfaces under load.
 The problem to which the paper is devoted is to assess the juxtaposition of fractal surfaces under load.
 Research methods: modeling of the contact interaction of the joint, analytical calculations.
 The novelty of the work: the bounds of applying models of contact interaction of surfaces (fractal and Hertz model) are defined and analyzed.
 Study results: the contact stiffness of flat surfaces joint for fractal models (plastic mode) and Hertz model (elastic mode) is defined, and the transfer point from one mode to another is found.
 Conclusions: with different roughness parameters, the joint compliance decreases with increasing load (increasing juxtaposition), and compliance under the same conditions increases with a decrease in roughness and an increase in fractal dimension D.
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