Fatigue durability of bimetallic diffusive and welded connections at sign-variable loadings

Results of fatigue tests of diffusive and welded connections of the diverse materials used in aviation engine-building and other industries are given. From positions of mechanics of fatigue failure the explanation for positive influence on endurance of bimetallic diffusive connections "soft" (from plastic metals) pro-layers is offered. The obtained data testify to rather high durability and operability of diffusive connections of heat resisting nickel alloys with ñsteels in the conditions of cyclically changing mechanical loadings in the wide range of temperatures.