Protective characteristics of energy absorbing elements under typical cabin explosion loads
[Objective]This study explores design methods for explosion-resistant energy-absorbing core elements in cabin subject to the joint effects of blast-induced shockwave and quasi-static barometric pressure.[Methods]Finite element numerical calculations are used to analyze the characteristics of flexing-type and yielding-type energy-absorbing elements in the above conditions in terms of load weakening factor,energy ab-sorption,deformation damage mode and maximum displacement at the center point of the lower panel,and the protective performance characteristics are obtained.On this basis,a dual-stiffness energy-absorbing element is proposed to resist the combined action of blast-induced shockwave and quasi-static barometric pressure and its performance is then compared with that of the two energy-absorbing elements.[Results]Under the action of blast-induced shockwave,the load dissipation and energy absorption ability of the yielding-type energy-absorbing element is better than that of the flexing-type energy-absorbing element;under the action of quasi-static barometric pressure,the deformation of the yielding-type energy-absorbing element is greatly affected by the time of action of the load,while the deformation of the flexing-type energy-absorbing element is almost unaffected by the time of action;under the combined action of blast-induced shockwave and quasi-static baro-metric pressure,the protection ability of the dual-stiffness energy-absorbing element is better than that of the single-stiffness flexing-type and yielding-type energy-absorbing elements.[Conclusion]The results of this study can provide a new approach to the design of explosion-resistant configurations in cabins.
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