Research on the Rational Design Method of Strength Reinforcement for Thin-Walled Structure Based on Limit Load Analysis

Abstract

Thin-walled structures subjected to internal or external pressure usually need to be reinforced with ribs. The design of ribs is generally based on experiences in engineering, and the results are often very conservative. In this paper, an approach for the rational design of reinforced ribs on thin-walled structures is proposed based on the limit load analysis method, maximizing the limit load of the reinforced thin-walled structure or minimizing the weight of the reinforced ribs. Firstly, the limit load numerical analysis was conducted to study rib forms at the continuous and discontinuous regions of the structure and find the rational ribs which provide the most effective reinforcement for the structure. Then, using the proposed rib forms, an engine test cabin was re-designed based on the limit load analysis to verify the feasibility and effects of the rib design. The engine test cabin after the redesign of the rib plate can reach 98% of the limit load of the original test cabin while the weight of reinforcing ribs is only 62% of the weight of the original ones, which means that the reinforcement design approach based on the limit load analysis method and the rib forms proposed in this paper is effective and feasible, and can achieve a structural lightweight design.

Rib Reinforcement Bionic Topology Optimization under Multi-Scale Cyclic Excitation

“…Choi et al [16] proposed an alternating structure of high and low ribs alongside a conventional structure and one with a high relative rib area. A limit load numerical analysis was conducted to study the rib forms in the continuous and discontinuous regions of a structure and find the rational ribs that provided the most effective reinforcement to the structure [17]. By integrating surface cutting optimization and a multi-patch stitching scheme on the parametric space, an explicit layout optimization method was developed to design rib-reinforced thin-walled structures with complex geometries [18].…”