ANALYSIS OF CONTACT INTERACTION BETWEEN A TUNGSTEN TRIOXIDE (WO3) MICROPARTICLE AND A FIRECLAY REFRACTORY UNDER HIGH-VELOCITY IMPACT
DOI:
https://doi.org/10.32782/3041-2080/2026-7-10Keywords:
contact mechanics, high-velocity impact, tungsten trioxide, aluminosilicate refractory (chamotte), contact stresses, Hertz theory, indentation depth, brittle fractureAbstract
This paper presents a comprehensive theoretical study of the tribological interaction and contact mechanics during the high-velocity impact of a spherical tungsten trioxide (WO3 ) microparticle, 10 μm in diameter, on a flat aluminosilicate refractory (chamotte/fireclay) substrate at a collision velocity of 200 m/s. The relevance of the research is driven by the need to optimize the processes of cold gas-dynamic spraying of functional ceramic coatings and to predict the mechanisms of erosive wear in the linings of industrial units. The primary objective of this work is to calculate the maximum contact stresses, estimate the indentation depth, and predict the fracture behavior of the materials in the local contact zone. The analysis is based on the modified Hertz theory for dynamic processes, incorporating a quasi-static approximation that is valid for subsonic impact velocities relative to the speed of sound in the investigated materials. The study includes a detailed review of the physical and mechanical properties of the interacting bodies, the calculation of the reduced elastic modulus of the system, and the determination of normal and shear stress fields. Particular attention is given to analyzing the probability of transition from elastic deformation to brittle fracture or plastic flow, taking into account the size effect on the strength of microparticles. The paper demonstrates that, despite the microscopic scale of the event, the resulting peak contact pressures (approximately 7 GPa) and radial tensile stresses significantly exceed the ultimate strength limits of the chamotte substrate. This shifts the process from an elastic collision regime to a state of intense erosive wear, accompanied by the formation of cone cracks and localized cratering. The obtained results provide a scientific basis for adjusting the technological parameters of spraying and selecting more resistant ceramic substrates
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