Abstract
1. The original mechanical properties of automatic couplings may change in the course of operation, especially the yield strength, which increases. This points to embrittlement of the material, in connection with which the ductile—brittle transition temperature rises and the characteristics of resistance to crack propagation decrease—KIc and GIc. 2. After 11–14 years of operation the yield plateau on the stress-strain diagrams disappears completely and the ductility decreases correspondingly. 3. The resistance to crack propagation in the transition zone of automatic couplings begins to decrease after not less than 11–13 years of operation. 4. The ductile—brittle temperature in the transition zone of automatic couplings rises more than 40–50° after 20 years of operation.
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