圆形泡沫铝填充钢管静态压缩性能研究

通过实验研究了圆形泡沫铝填充钢管构件在静态压缩下的性能。对本试验范围内的结果进行分析可知,在外围钢管厚度较小时,在静态压缩过程中圆形泡沫铝填充钢管构件发生局部屈曲变形,压缩变形曲线现为弹性阶段和屈服平台阶段;在外围钢管厚度较大时,圆形泡沫铝填充钢管构件发生整体失稳,压缩曲线在经历弹性阶段后,进入弹塑性屈服阶段,到达峰值荷载后,构件承载力迅速下降。在试验基础上,提出了圆形泡沫铝填充钢管构件的平均压溃载荷和极限压溃载荷的设计公式,同时将试验结果与理论公式进行了比较,两者数值较为吻合。

泡沫铝填充钢管轴向压缩性能和吸能能力研究

为了研究泡沫铝填充钢管轴向压缩性能,本文以泡沫铝填充钢管为研究对象,通过试验研究泡沫铝填充钢管构件在轴向准静态载荷条件下的承载能力和变化情况;同时通过有限元数值模拟对泡沫铝填充钢管的承载能力、变形模式、应力分布和能量吸收特性进行研究。研究表明:相比于纯钢管,泡沫铝填充钢管在轴力超过极限荷载之后,仍有较大的剩余承载力,整个压缩过程表现为稳态压缩;填充钢管轴向和侧向变形的幅度较小,填充钢管的变形无空腔的存在、大应力区也有所减小,轴压下的变形规律性更好,耗能能力更优。

泡沫铝填充方钢管压弯构件滞回性能的试验研究

通过6根泡沫铝填充方钢管构件和3根方钢管构件进行的低周反复荷载试验,分析了填充泡沫铝对方钢管构件滞回性能的影响,以及泡沫铝材料的相对密度、孔径对构件滞回性能的影响。试验结果分析表明,试件荷载-位移滞回曲线的图形饱满,没有明显的捏缩现象出现;填充泡沫铝后,钢管的滞回曲线比空钢管的更饱满,滞回性能得到了提高,抗震性能良好。

Mechanical properties and energy absorption properties of aluminum foam-filled square tubes

Longitudinal and transverse mechanical properties and energy absorption properties of foam-filled square tubes under quasi-static loading conditions were studied.The foam-filled thin-walled square tube was fabricated with aluminum tube as its shell and closed-cell Al-Mg alloy foam as its core.The results indicated that the plateau region of the load-displacement curve exhibited a marked fluctuant serration which was clearly related to the formation of folds.The longitudinal deforming mode of foam-filled square tube was the same as that of the empty tube,but the fold number of foam-filled square tube was more than that of the empty tube.The longitudinal compression load and energy absorption value of foam-filled square tube were higher than the sum of that of aluminum foam (alone) and empty tube (alone) due to the interaction between tube and filler.In transverse direction,the compression load and energy absorption ability of foam-filled square tubes were significantly lower than those in longitudinal direction.