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Method of accuracy assessment of performance indicators of construction materials

V. Stadnychenko, R. Dzhus, S. Pleshkunov
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Description: The article presents the results of the development of an accelerated evaluation method for comparing contact fatigue strength during tests with friction rolling with slipping of surfaces reinforced by traditional gas cementation and plasma nitrid-ing using the technology AVINIT N (ZAT "FED"). The work was carried out on samples made of heat-resistant steel 20H3MVF GOST 20072. The urgency of the work is due to the decision of DP "Antonov" to develop prototype drives of generators for the aircraft An-148/158/178 with an increase of up to 12,000 hours without a repair resource, which required the replacement of the traditional method of strengthening the gear teeth cementation to a new, more advanced method of strengthening - ion-plasma nitriding. To do this, there was a need for comprehensive research on fatigue. Traditional trials require a long term, which can-not be carried out in a short time. The purpose of the work was to develop a method for accelerated assessment of contact fatigue strength when conducting tests of structural materials when slip friction with a slip. The analysis of the results of accelerated tests and further research of samples confirms the legitimacy of approaches to conducting such tests. This analysis shows that when the specific contact load σ = 1140 MPa on the working surfaces of all tested samples formed the initial cells of fatigue excitation. The method of acoustic emission proved the high efficiency of recording the transition moment of tribosystems from normal wear to initial fatigue failure. Thus, the proposed method of accelerated evaluation of the indicators of fatigue damage to structural materials substantially reduces the time of expert evaluation in the design of new structural materials and ways to strengthen them.


Keywords: accelerated estimation technique, fatigue strength, rolling with a slip, rolling test, accelerated test methods, strengthening of friction surfaces by cementation, strengthening of friction surfaces by nitriding, strengthening of AVINIT N.

References

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Reference:
 Stadnychenko, V.M., Dzhus, R.M. and Pleshkunov, S.A. (2019), “Metodyka pryskorenoi otsinky pokaznykiv vtomnoi poshkodzhuvanosti konstruktsiinykh materialiv” [Method of accuracy assessment of performance indicators of construction materials], Systems of Arms and Military Equipment, No. 2(58), pp. 122-131. https://doi.org/10.30748/soivt.2019.58.15.