METHODOLOGICAL APPROACHES TO STUDYING THE CRUSHING OF MICROPRO-JECTIONS IN CONTACT BETWEEN DISSIMILAR MATERIALS UNDER THERMAL DE-FORMATION IMPACT

Abstract A methodology has been developed to study the contact interaction between dissimilar materials subjected to thermomechanical deformation over time. Kinetic curves were constructed to analyze contact formation, plastic deformation of microprojections, changes in microprojection height, contact stresses on microprojection contact areas, and variations in mechanical properties at the surface and within the near-contact volume of microprojections. These analyses were conducted across temperature ranges from room temperature to pre-melting points and pressure intervals before and after threshold values. The study demonstrates that plastic deformation of microprojections is responsible for contact formation and activation processes on contact surfaces. Additionally, the level of second-kind microstresses on microprojection contact areas significantly exceeds the nominal stress values used in calculation formulas. The research establishes that temperature and pressure have distinct effects on the intensity of plastic deformation, contact formation, and changes in mechanical properties at the surface and within the near-contact volume. The proposed process scheme enables the production of high-purity flat metal surfaces with adjustable mechanical properties and precision joints (both detachable and non-detachable).