Experimental and Numerical Studies on the Energy Absorption Characteristics of Simple and Multi-Cell Shapes of Quasi-Hemisphere Thin-Walled Structures

Energy absorbers are used to reduce accident induced damages. thin-walled energy absorbers are widely used in modern industries due to their high efficiency and ease of manufacturing. in this study, thin-walled stainless steel structures in quasi-hemisphere geometry were subjected under quasi-static loading using santam 150kn apparatus. experimental results were compared with the results of numerical simulations by ls-dyna and it was shown that there is a good agreement between experimental and numerical results. two different collapse types in radial and circumferential directions were observed. also, the multi-cell quasi-hemisphere specimens from 3 to 6 cells were numerically investigated and it is observedthat increasing the number of cells increases the absorbed energy. increasing the thickness of the quasi-hemisphere sample in smaller diameter specimens is more effective. the results showed that six-cell specimen with the largest diameter and the minimum thickness has the most increase of specific absorbed energy (sae) with respect to simple section.