Structural Strength Assessment for Carbody of Container Freight Car

초록

The structural evaluation for carbody of a container freight car in railway applications was performed using several engineering analysis techniques to assess the structural strength of newly manufactured carbody of a container freight car. The carbody was designed with a steel and stainless steel for the railway transportation. Before the actual assessment of structural strength, finite element method (FEM) characterization was employed to understand the stress distribution in a carbody of container freight car. The strain gages were attached on the carbody based on the FEM results in order to measure actual structural strength during static loadings. The current research on stress and safety analysis of freight container carbody leads the following summaries. From the vertical loading and compressive loading test results, it was found that the stress values in the carbody of freight car under max loading condition showed within the yield strength of carbody materials. The FEM analysis results showed a good agreement with experimental results. The max stress during static loading test occurred at the intersection of side sill and bolster. The max stress during horizontal compressive loading test occurred at the curvature area of bolster. The max stress for the combined composition stress occurred at the intersection of center sill and bolster, and they were within the yield strength of carbody materials. The amount of slack, for the determination of camber amount, in carbody was obtained at the center of side sill, and they were within the optimal camber range. The measurement results of natural frequency in carbody showed 10.7 Hz, and satisfied with design criteria. All occurred max stress values were within allowable stress range, therefore, it was found that the freight carbody would be safe based on the evaluation results.