PSI - Issue 81

Andrii Gypka et al. / Procedia Structural Integrity 81 (2026) 478–485

481

Fig. 3. Schematic diagram for measuring the friction coefficient and controlling the sliding speed. PS – power supply unit, TG – tachogenerator

For measuring the contact electrical resistance (CER, R ) parameters of the tribological pair and monitoring their variation during friction and wear, the electrical circuit shown in Fig. 4 was used.

Fig. 4. Basic electrical circuit for measuring the CER ( R ) parameters of the tribological pair. 1 – current collector; 2 – counter-specimen; 3 – specimen; R1 – reference resistor; R2 – adjustable resistor; R3 – resistance box

At the first stage, friction and wear processes of the tribological pair were investigated: specimen made of steel 45, counter specimen made of steel 30Kh3MFSA. The lubricating medium was pure inactive vaseline oil with the additive Anglamol-99 (to eliminate the influence of auxiliary factors from the lubricant side). The measured parameters included wear rate III and CER R , along with examination of the structural state characteristics of the specimen friction surface (DSS type). The tests were carried out at a constant contact pressure P = 8 MPa and a smooth variation of sliding speed V= 0.2 – 12V = 12 m/s. The results of the experimental investigations are presented in Table 2 and Fig. 5.

0,01 0,1 1 10 100 1000 10000

0,21 2 3 4 5 6 7 8 9101112 Sliding speed V , m/s

Fig. 5. Graphs of the dependence of wear rate I (■) and contact elect rical resistance R (□) of the steel 45 – steel 30Kh3MFSA tribological pair on sliding speed V at P = const in pure vaseline oil with Anglamol-99 additive.