About Lorenz attractors in a dynamic systems of friction

In a simple dynamic model, included a elastic-dissipative subsystem of in-dentor and a friction subsystem the forming of chaotic attractor in some condition is demonstrated. The motions of indentor relatively to sample are formed the attractor, known as `Lorenz attractor' in nonlinear dynamic. This formation is lays with an evolution changes in tribomedia, connected to work and power of dissipation forces in tribocoupling. The determining chaos forming condition is demonstrate two.