Abstract
In this paper, flattening process of polyurethane foam-filled aluminum columns with rectangular and square cross-sections subjected to lateral compression load is investigated, theoretically and experimentally. For this purpose, some flattening tests were performed on the foam-filled rectangular columns using a DMG machine, model 7166. Based on a new theoretical plastic deformation model, a relation is derived in order to predict instantaneous lateral load of the foam-filled rectangular columns during flattening process. Theoretical instantaneous lateral load versus lateral displacement diagrams of the specimens are compared with the experimental measurements, which shows a good agreement between them. Also, based on the experimental results, effects of different parameters such as load application directions, injection of polyurethane foam into columns, foam density and presence of the adhesion between the foam and the column inner wall are investigated on the flattening behavior of the structure. Furthermore, deformation modes of the specimens with different cross-sections are studied.
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