Experimental research of back effect for mechano-sliding fatigue of the 0.45% carbon steel–siluminum active system*

Abstract

We discuss the experimental research of damage regularities of a metal-to- metal active system sample piece at sliding and mechano-sliding fatigue tests. In the report, the test technique is given. Experimental values of characteristics of resistance of sliding and mechano- sliding fatigue of an examined sample piece of sliding node are received. New regularities of a back effect for mechano-sliding fatigue of the 0.45% carbon steel-siluminum active systems are found. sliding friction (sliding fatigue) test; wear-fatigue (mechano-sliding fatigue) test. At the first stage of tests it is necessary to find the regularities of wear processes for the next it comparison with the test results on the second stage. 1. Methods of Research. 1.1. Sliding Fatigue Tests. The model of an active system for sliding fatigue tests is shown in Fig. 1. The specimen 1 made of a 0.45% carbon steel with a test portion diameter of 10 mm is cantilever fixed in a spindle 2 of a testing machine UKI-6000-2 and rotate with frequency of 3000 min 1 . The counterspecimen 3 with a width of 4 mm, made of siluminum is pressed to dangerous cross section of the specimen 1 with the force F N which magnitude is supported a stationary value during the tests of each friction pair the specimen/counterspecimen. The lubricant - universal all-weather engine oil SuperLuxoil SAE 15W-40 is brought in a friction region by the dropwise method. The measuring of magnitude of the cumulative linear wear i of friction pair with the precision of 2 m in the local points 1-8 uniformly proportioned on ambit of dangerous cross section of the specimen is made periodically (Fig. 1b). The cumulative wear of a friction pair specimen/counterspecimen i f