轻量化多孔金属夹芯复合板的耐撞性  

Crashworthiness of Light-weight Sandwich Panels with Cellular Metallic Cores

作　　者：敬霖[1] 赵永翔[1] 

机构地区：[1]西南交通大学牵引动力国家重点实验室,成都610031

出　　处：《机械工程学报》2014年第16期1-5,共5页Journal of Mechanical Engineering

基　　金：牵引动力国家重点实验室自主研究课题资助项目(2014TPL_T09)

摘　　要：以后面板中心点的挠度响应作为多孔金属夹芯复合板耐撞性能的评价指标,基于夹芯结构的理论分析框架模型,采用考虑芯层强度的拉-弯联合作用屈服准则,建立撞击载荷下轻量化多孔金属夹芯复合板动态响应的理论模型。该分析模型将多孔金属夹芯板的整个动态响应过程分为三个连续的阶段:流-固耦合阶段、芯层压缩阶段和夹芯板拉-弯共同作用阶段。第一阶段假定载荷均匀分布在夹芯板前面板的撞击区域,随后在第二阶段渐进压缩芯层,直到夹芯板中心区域的前、后面板和芯层达到共同速度。第三阶段中,基于能量平衡的经典实心板理论和宽泛的夹芯结构屈服准则,给出夹芯板的最大永久挠度和响应时间的解析解。理论预测与试验结果吻合较好。研究结果对多孔金属夹芯复合结构的耐撞性分析和评估具有一定的参考价值。Based on the existing three-stage theoretical framework, a theoretical analysis is developed to predict the dynamic response of sandwich panels with cellular metallic cores under impact loading by incorporating a yield locus considering the bending and stretching as well as the strength of the core. The central point permanent deflection of the back face-sheet is considered as an index to evaluate the crashworthiness of sandwich structures. In this analytical solution, the whole response of the sandwich panel is split into three sequential stages：fluid-structure interaction, core compression, and overall bending and stretching. The impulse is assumed to be a uniform distribution over the impact area in the first stage. The metallic foam core is considered approximately to be a progressive compressive mode in the second stage, until the face-sheets and core obtain an equal velocity. In the final stage, a classical monolithic plate theory based on an energy dissipation rate balance approach is employed;the maximum back face-sheet central point deflections and response time are obtained by incorporating a comprehensive yield locus. A reasonable agreement between the theoretical predictions and experimental results is found. The proposed theoretical model is helpful to guide the crashworthiness applications of cellular metallic sandwich structures.

关 键 词：夹芯结构 多孔金属 轻量化 耐撞性 动态响应 

分 类 号：TB33[一般工业技术—材料科学与工程]