Abstract
There are defects including peak stacking and large load fluctuations in existing multi-tube combined structures. To overcome these defects, a differentiated combination design based on the idea of peak load dislocation superposition is undertaken for the height configuration and diaphragm spacing configuration of each tube. The influence of time to peak load is revealed by combining experiment, theory, and simulation. The results show that the height difference only induces a difference in the time to initial peak loads of tubes, while the subsequent peak loads remain stacked, which cannot reduce the load fluctuations. The variations of the diaphragm spacing can prolong or shorten the duration of deformation of folds in a designated area, thus changing the formation timings of subsequent peak loads, which is a feasible method for controlling the time to formation of the peaks. By optimally setting heights and distributing diaphragm spacings of tubes, peak loads of multi-tube structures can be fully separated, thus reducing the initial peak and load fluctuations. The initial peak load and the fluctuations of the 6-4GT-ΔJ-ΔH 2-Adj combined tube constructed based on the configuration differentiated design idea are reduced by 45.33% and 76.62% respectively, while maintaining the high energy absorption of the system.
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