Structural behavior evaluation of T-joints of the composite bogie frame under bending

摘要

This study evaluates the failure strength and failure modes of two types of T-joint used in a composite bogie frame under a bending load. The average failure load and displacement of the adhesive-only joint were 4.1 kN and 0.99 mm. The cracks propagated through the bond layer and followed a mode I propagation mode. In contrast, the joint with the adhesive bonding and skin had an average failure load of 68 kN and a displacement of 8.1 mm. It also showed a mode I propagation trend. The strain distribution for the whole region of the two joints was evaluated with FE analysis. A comparison of experiment results and the FE analysis results revealed that the error was in range of 5.33%–42.6% for the adhesive-only joint and 1.07% and 17.3% for the joint with the adhesive bonding and skin. The maximum stress concentration locations showed good agreement between the experiment and FE analysis.