泡沫混凝土填充旋转薄壁多胞方管负泊松比结构面内压缩性能  

In-plane compression properties of negative Poisson's ratio structure of rotating thin-walled multi-cell square tubes with foam concrete filler

作　　者：刘浩 周宏元 王小娟 张宏[2] LIU Hao;ZHOU Hongyuan;WANG Xiaojuan;ZHANG Hong(Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education,Beijing University of Technology,Beijing 100124,China;State Key Laboratory of Explosion Science and Technology,Beijing Institute of Technology,Beijing 100081,China)

机构地区：[1]北京工业大学城市与工程安全减灾教育部重点实验室,北京100124 [2]北京理工大学爆炸科学与技术国家重点实验室,北京100081

出　　处：《复合材料学报》2024年第2期839-857,共19页Acta Materiae Compositae Sinica

基　　金：国家自然科学基金(52278477,52178096);北京理工大学爆炸科学与技术国家重点实验室开放基金(KFJJ23-12 M)。

摘　　要：为改善薄壁金属管件的力学及吸能性能,提出了一种泡沫混凝土填充旋转薄壁多胞方管负泊松比结构(RSTFC)。对薄壁多胞方管(TMST)、旋转薄壁多胞方管(RTMST)和RSTFC试件进行准静态面内压缩试验,研究了3类不同试件的变形模式、载荷-位移曲线和吸能性能。试验结果表明:TMST、RTMST和RSTFC试件均表现为压缩破坏;对比于TMST试件,RTMST试件因发生旋转变形可有效降低载荷峰值,同时吸收更多能量,压溃力效率和能量吸收分别增大了73.2%和33.6%;泡沫混凝土的存在促使铝管在试件旋转过程中发生了一定程度的变形及泡沫混凝土不断压缩变形,因此填充有200 kg/m^(3)泡沫混凝土RSTFC试件的压溃力效率和能量吸收较RTMST试件分别增大了22.5%和8.9%。基于试验验证的数值结果表明:铝管和泡沫混凝土之间承载能力的相互匹配决定了RSTFC试件的力学及吸能性能,可通过调整泡沫混凝土密度、铝管壁厚和泡沫混凝土填充方式等实现对RSTFC试件变形模式、载荷传递与吸能性能的调控。因两个周期性结构试件具有相对更高的比吸能和压溃力效率,建议在实际工程中应用。To improve the mechanical and energy absorption properties of thin-walled metal tubular structures,a type of negative Poisson's ratio structure of rotating thin-walled multi-cell square tubes with foam concrete filler(RSTFC)was proposed.Firstly,quasi-static compressive test on the thin-walled multi-cell square tubes(TMST),rotating thin-walled multi-cell square tubes(RTMST),and RSTFC specimens were carried out,and their deformation mode,load-displacement curve,and energy absorption performance were experimentally investigated.The test results show that the TMST,RTMST,and RSTFC specimens all exhibit compressive failure.Furthermore,it is found that the rotational deformation of the RTMST specimen can effectively reduce its peak load and improve the energy absorption by 73.2%and 33.6%in comparison to the TMST specimen.Moreover,due to the presence of foam concrete,the aluminum tubes undergo a certain degree of deformation during the rotational process,accompanied by continuous compression deformation of the foam concrete.As a result,the crushing force efficiency and energy absorption of the RSTFC specimen filled with 200 kg/m^(3) foam concrete increase by 22.5%and 8.9%respectively compared to those of the RTMST specimen.Based on the validated numerical model by test data,it is observed that the matching of bearing capacity between aluminum tube and foam concrete significantly influence the mechanical properties and energy absorption of the RSTFC specimen.Therefore,the deformation mode,load transfer,and energy absorption performance of the RSTFC specimen could be regulated by adjusting the density of foam concrete,the wall thickness of the aluminum tube,and the filling mode of foam concrete.It was recommended to apply RSTFC with two periodic structures in practical engineering due to their relatively higher specific energy absorption and crushing force efficiency.

关 键 词：负泊松比结构 旋转薄壁多胞方管 泡沫混凝土 准静态压缩 变形模式 吸能性能 载荷传递 

分 类 号：TB301[一般工业技术—材料科学与工程] TB333