Guan, Weiyuan
Gao, Guangjun
Yu, Yao
Funding for this research was provided by:
National Key R & D Program of China (2016YFB1200403)
National Natural Science Foundation of China (51975588)
Fundamental Research Funds for the Central Universities of Central South University (2017gczd009 and 2018zzts026)
Article History
Received: 24 January 2021
Revised: 26 March 2021
Accepted: 21 April 2021
First Online: 15 May 2021
Declarations
:
: The authors declare that they have no conflict of interest.
: All the presented results can be replicated, and all the necessary data sets for the problems are present in the manuscript. The nonlinear finite-element code LS-DYNA version SMP R7.1.1 is used to solve the FEM problems in this paper. The impact test trolley components are modelled using shell elements; the weight of the trolley body is 21.28 t, which is approximative to the mass of a subway vehicle. The trolley equipped with an energy-absorbing structure impacts the rigid body at velocity <i>v</i><sub>0</sub>. The length, wall thickness and tube radius of the shrinking circular tube are 600, 12 and 53 mm, respectively. Three element sizes, including 4 × 4 × 4, 2 × 2 × 2 and 1 × 1 × 1 mm, are modelled. The shrinking circular tube energy absorbers meshed with SOLID164 elements. The eight-node solid elements are utilized in the simulation process, and the fully integrated methods are adopted to avoid hourglass energy. The sensitivity analysis is implemented in the global sensitivity indices for nonlinear mathematical models (Sobol CitationRef removed).