泡沫铝填充6082-T6铝合金圆管构件轴压力学性能

Axial-crushing performance of aluminum foam-filled 6082-T6 aluminum alloy circular tube

薄壁金属构件与吸能泡沫材料组合形成的复合构件具有优越的耗能性能,本文将泡沫铝填充至6082-T6高强铝合金圆管中作为建筑结构中的耗能复合构件。为获得泡沫铝填充6082-T6铝合金圆管在轴压荷载下的响应特征、破坏机理及耗能性能,进行了20组不同径厚比和高径比的铝合金空管以及泡沫铝填充复合管的轴压试验。构件表现出3种破坏模式:劈裂破坏、叠缩劈裂破坏、叠缩劈裂+不规则变形破坏。填充泡沫铝能够有效改善构件在轴压荷载下的变形能力,避免其发生不规则变形破坏,并提高构件耗能能力。基于有限元分析平台LS-DYNA提出了合理的有限元建模方法并开展了参数分析,结果表明:构件峰值承载力与吸能能力均随壁厚和管径的增大而增大。当高径比增大时构件在轴压荷载下发生失稳破坏,而填充泡沫铝后构件发生失稳破坏的临界高径比增大。

The composite components composed of thin-walled metal tubes and foam materials have advantageous energy dissipation capability.In this study,aluminum foam-filled 6082-T6 aluminum alloy circular tubes were proposed as energy absorption composite components in building structures.Twenty groups of empty aluminum tubes and aluminum foam-filled composite tubes with different dimensions were tested under axial static compressive load to investigate the deformation behavior,failure mechanism,and energy absorption capacity of aluminum foam-filled 6082-T6 aluminum alloy circular tubes.Experiment results show that the specimens exhibited three failure modes under axial compression,including splitting failure,symmetry folding and splitting failure,folding and splitting and irregular deformation failure.Filling aluminum foam could effectively improve the deformation capacity of the components,prevent irregular deformation failure,and enhance their energy absorption capacity.Finite element(FE)model was established based on LS-DYNA,and parametric study was carried out.It shows that the peak crush load and energy absorption capacity of the tubes increased with the increase in the thickness and diameter of the tubes.Moreover,instability of the tubes was observed from the numerical results when the ratio of height to diameter exceeded a certain value,while filling aluminum foam could increase the critical height to diameter ratio of the components.