STUDY OF THE KINETICS OF FATIGUE DESTRUCTION OF RAILWAY WHEEL METAL WITH DIFFERENT STRENGTH LEVELS USING THE CORRELATION ANALYSIS METHOD.

In practice, products are often subjected to cyclic loads, repeated changes in stresses of small magnitude can lead to failure due to the development of a fatigue crack. For railway wheels, this means increasing the intervals between periodic inspections and improving the safety of railway transportation. A correlation analysis of the relationship between the indicators of mechanical properties determined under static tension, dynamic bending and indicators determined under cyclic loading was performed. For several pairs of characteristics, the value of the Pearson coefficient was set at 0.99 (Kth and relative elongation, Kth and impact toughness, Kfc and relative narrowing, K* and hardness, K* and ultimate strength). The criterion n is the least sensitive to changes in other mechanical properties, it is shown that only elongation and impact strength have a high correlation with this characteristic.