Abstract
The self-locked energy absorbing system can prevent lateral splash of tubes from impact loadings without any requirements for boundary constraints or inter-tube fasteners, thus breaking through the limitation of widely-used round tube systems. To reveal the mechanism of the impact response of self-locked systems, both impact experiment and FEM simulations are carried out. Based on the experimental and simulation results, a one-dimensional theoretical crushing model of the system is developed to analyze the dynamic response of the system, in which a plastic hinge model of the unit cell is proposed for the force-deformation relation. Three deformation modes of the system are predicted and observed, and moreover, the criteria to determine the deformation mode of the system are established analytically. A guideline on the design of the self-locked system is summarized, which is helpful in practical applications.
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