%0 Journal Article %T Experimental and Numerical Studies on the Characteristics of Simple and Multi-cell Shapes of Quasi-hemisphere Thin-walled Structures %J International Journal of Engineering %I Materials and Energy Research Center %Z 1025-2495 %A Parsapour, Masoud %D 2014 %\ 08/01/2014 %V 27 %N 8 %P 1307-1316 %! Experimental and Numerical Studies on the Characteristics of Simple and Multi-cell Shapes of Quasi-hemisphere Thin-walled Structures %K Thin %K walled structure %K energy absorber %K Quasi %K hemisphere %K multi %K cell %R %X  Thin-walled energy absorbers are used to reduce accident induced damages. In this study, thin-walled stainless steel structures in quasi-hemisphere geometry were subjected under quasi-static loading with Santam 150KN apparatus. Experimental results were compared with results of numerical simulations by LS-DYNA and it was shown that there is a good agreement between experimental and numerical results. Also, the multi-cell quasi-hemisphere specimens were numerically investigated and it was presented that increasing the number of cells increases the absorbed energy. The results showed that Six-cell specimen with the largest diameter and the minimum thickness has the most increase of Specific Absorbed Energy (SAE). %U https://www.ije.ir/article_72367_ab28d7200e52310eced303cb220118dd.pdf