Fracture Mechanism Analysis and Design Optimization of a Wheelset Lifting Mechanism Based on Experiments and Simulations

In this study, material and dynamic stress experiments are combined with finite element (FE) simulations to reveal the fracture mechanism of wheelset lifting apparatus, a structural design optimization scheme based on double-layer Kriging surrogate model is proposed. The apparatus first clarified through analysis macro/micro tests. Static strength modal analyses then performed perfect in terms performance. An efficient, robust, fatigue method improved non-dominated sorting genetic algorithm II (NSGA-II) finally proposed improve original scheme. For mechanism’s fracture, crack source found transition fillet surface lug ring, where has characteristics two-way, multisource, high-cycle, low-stress fatigue. It further revealed that vibration occurring at point maximum main cause fracture. effectiveness validated via comparative analysis.