Research on finite element analysis methods and experimental verification techniques for civil aircraft

Purpose To support civil aircraft airworthiness validation, this paper aims to establish a standardized, efficient and precise technical framework for structural strength analysis and test verification, addressing the complexity of aircraft structural mechanics. Design/methodology/approach A three-level finite element analysis (FEA) methodology (Natural Grid, Refined and Detail finite element model (FEM)) is developed, integrated with parametric modeling, automated strength analysis and full-scale static test verification following the building block approach. Findings The three-level FEA system accurately simulates global load paths, regional stress distributions and local structural behaviors; its predictions (e.g. 103% of target failure load) are closely matched with experimental results, which ensures structural compliance with airworthiness requirements. Originality/value This study proposes a standardized three-level FEA framework for civil aircraft, advancing digital transformation in structural development, enhancing simulation precision and providing robust technical support for optimizing aircraft structural design and aviation safety.