Ultimate strength and fracture failure of hull stiffened plates based on plastic accumulation under cyclic loading

Abstract

Relying on nonlinear finite element analysis of ANSYS software, the ultimate strength and fracture failure of hull stiffened plates based on plastic accumulation have been studied under cyclic compression and compression-tension load. In addition, the shakedown is also preliminarily discussed. According to different cyclic load patterns, the influence of material models such as elastic-perfectly plastic, isotropic hardening, and Chaboche model on plastic accumulation, ultimate strength, and fracture characteristics of stiffened plates is mainly researched. Studies have shown that material models have a significant impact on the plastic accumulation region, plastic accumulation speed, and the ultimate strength of hull stiffened plates under cyclic loading. As the number of cycles increases, plastic accumulation will cause hull stiffened plates to fracture or reach a shakedown state. When the Chaboche model is adopted, the plastic accumulation speed of hull stiffened plates under cyclic loading is the slowest, and the decrease in ultimate strength is the most moderate. For the cyclic load amplitude and pattern selected in this study, when plastic accumulation causes stiffened plates to fracture, its ultimate strength drops to 24–55% of the first compressive ultimate strength.