功能梯度点阵夹层结构抗爆性能数值仿真研究  

Numerical simulation for anti-explosion performance of functionally graded lattice sandwich panels

作　　者：王同银 刘杨 李刚[1] 陆晓峰[1] 朱晓磊[1] 

机构地区：[1]南京工业大学机械与动力工程学院,南京211816

出　　处：《振动与冲击》2018年第3期34-39,53,共7页Journal of Vibration and Shock

基　　金：国家自然科学基金青年项目(11402132)

摘　　要：为进一步提高点阵夹层结构的抗爆性能,提出了面板上薄下厚,芯层上细下粗(正向梯度化)的功能梯度点阵夹层结构,利用ANSYS/LS-DYNA有限元软件对新结构的抗爆性能进行了数值模拟研究。分别探讨了面板梯度化、芯子梯度化对结构抗爆性能的影响,并对功能梯度点阵夹层结构的各尺寸参数做单因素分析。结果表明,同时考虑面板和芯子的正向梯度化能大幅度提高点阵夹层结构吸能,面板正向梯度化对吸能的贡献比例高于芯子梯度化。此外,由单因素分析可知,上下面板厚度、芯层厚度以及芯杆与下面板之间的夹角对抗爆性能影响很大,芯杆上下截面边长对抗爆性能的影响相对较小。To improve lattice sandwich panels' anti-explosion performance,a functionally graded lattice sandwich panel structure was proposed,its upper facesheet was thinner than lower one,its upper core layer was fine and lower one was coarse( namely positive gradient distribution). The FE software ANSYS/LS-DYNA was used to study the antiexplosion performance of the new sandwich structure. Effects of facesheet gradient and core layer one on the anti-blast performance of sandwich panels were investigated,respectively. Single factor analyses were performed for size parameters of functionally graded lattice sandwich structures. The results indicated that energy absorption of lattice sandwich panels can be greatly improved by simultaneously considering positive gradient distribution of facesheet and core layer; the contribution of facesheet positive gradient distribution to energy absorption is more significant than that of core layer positive gradient distribution; moreover,the thicknesses of upper panel,lower one and core layer,and the angle between core bar and lower facesheet have a larger effect on the new structure's anti-blast performance,while the effect of sizes of core bar's top and bottom sections is smaller.

关 键 词：功能梯度 点阵夹层 抗爆性能 数值模拟 

分 类 号：O383[理学—流体力学]