Loading state in local loading forming process of large sized complicated rib-web component
Abstract
Purpose
The purpose of this paper is to explore the basic loading state in local loading forming process of large-sized complicated rib-web component, which is important for understanding process characteristic, controlling metal flow and designing preformed geometry of the local loading forming process. Moreover the analytical models for different loading states are established to quickly predict the metal flow.
Design/methodology/approach
Through analysis of geometric characteristic of large-sized complicated rib-web component and the deformation characteristic on planes of metal flow by local loading method, a representative cross-section is put forward and designed, which could reflect the local loading forming characteristics of large-sized complicated rib-web component. Finite element method (FEM) is used to analyze the stress and metal flow, and the analytical models of metal flow are established by using slab method (SM).
Findings
Three local loading states and one whole loading state are found in the local loading forming process of representative cross-section. Further, four loading states also exist in local loading forming process of large-sized complicated rib-web components. With the metal distribution in the process, some local loading states may turn into whole loading state. For the representative cross-section, the relative error of metal distribution between SM and FEM results is less than 15 per cent, and the relative error of metal in the rib cavity between SM and FEM results is less than 10 per cent.
Originality/value
Metal flow can be controlled by adjusting the loading states in the process. According to the metal flow laws in different loading states, a simple unequal-thickness billet can be designed to achieve initial metal distribution, and then, the secondary metal distribution can be achieved in the process.
Keywords
Acknowledgements
The first author would like to thank Professor Sheng-dun Zhao at School of Mechanical Engineering, Xi’an Jiaotong University for help. The authors would like to gratefully acknowledge the supports of National Natural Science Foundation of China for key program (Grant No. 50935007) and National Basic Research Program of China (973 Program, Grant No. 2010CB731701).
Citation
Zhang, D.-W. and Yang, H. (2015), "Loading state in local loading forming process of large sized complicated rib-web component", Aircraft Engineering and Aerospace Technology, Vol. 87 No. 3, pp. 206-217. https://doi.org/10.1108/AEAT-02-2013-0045
Publisher
:Emerald Group Publishing Limited
Copyright © 2015, Emerald Group Publishing Limited