ข้อมูลผลงานวิจัย

Rail transport is a high priority for transporting goods and passengers in several countries. Although railway wheels are specifically designed and manufactured for intended uses, wheels are subjected to increasing axle loads and running speeds and requires several returning processes to keep wheel profile proper geometry for wheel-rail interaction. Excessive wear on railway wheel also causes rolling contact fatigue which is major factor contributing to decreasing lifespan of railway wheels. This research aims to evaluate the fatigue performance of high-strength steel under cyclic loading conditions. Standardized single-edge notched bend specimens were machined from ER9 railway wheels, ensuring compliance with ASTM E1820 dimensional and preparation requirements. Cyclic loading tests were conducted using a servo-hydraulic testing machine under 3-point bending with constant displacement to simulate stress conditions. The analysis focused on characterizing the material crack, specifically its pre-crack initiation and propagation resistance.