摘要
为拓宽加强型蜂窝应用,研究其力学性能与结构参数的关系。首先,分析加强型蜂窝的结构,提取Y型胞元,以此为基础分析塑性铰单元。然后,将简化超折叠理论应用到Y型胞元结构折叠变形吸能分析,并分别利用基于屈雷斯佳和米塞斯屈服准则,推导蜂窝异面方向准静态平台应力理论模型。再次,选用壁厚为0.15 mm、边长为2.5 mm的铝合金5052H18,通过Ls⁃Dyna建立蜂窝仿真模型,获得平均应力,并将理论值与仿真值进行对比。结果表明,2种屈服准则下,理论值与仿真结果相关性为0.96,偏差在-12.16%~3.60%。最后,对普通型和“4+1”型蜂窝制样进行准静态压缩测试,结果表明,2种规格理论强度与实际测试强度偏差在-2.51%~1.56%。说明理论计算式正确,可为加强型蜂窝选型提供有效的设计依据,为工程应用提供一定的指导价值。
The quasi⁃static compressive stress of reinforced honeycomb is studied.Firstly,the structure of the reinforced honeycomb is analyzed,the Y⁃shaped cells are extracted,and the plastic hinge is analyzed based on this.Then,referring to the simplified superfolding theory,based on Tresca and Mises yield criterion,the theoretical formula of axial plateau stress is deduced.Thirdly,the aluminum alloy 5052H18 with a wall thickness of 0.15 mm and a side length of 2.5 mm is selected,and the honeycomb simulation model is established by Ls⁃Dyna to obtain the average stress.Comparing the theoretical value with the simulated value,the results show that:under the two yield criteria,the correlation between the theoretical value and the simulation result is 0.96,and the deviation is from-12.16%to 3.60%.Finally,the sample preparation and quasi⁃static test of ordinary and“4+1”honeycombs shows that the deviation between the theoretical strength and the actual strength of the two specifications is between-2.51%and 1.56%.It shows that the theoretical calculation formula given in this paper is correct,which can provide an effective design basis for the selection of reinforced honeycombs,and provide a certain guiding value for engineering applications.
作者
许鹏
夏东伟
王成强
宋扬
XU Peng;XIA DongWei;WANG ChengQiang;SONG Yang(CRRC Changchun Railway Vehicles Co.,Ltd.,Changchun 130062,China;Shenzhen Cansinga Technology Co.,Ltd.,Shenzhen 518102,China)
出处
《机械强度》
CAS
CSCD
北大核心
2024年第1期87-95,共9页
Journal of Mechanical Strength
关键词
加强型蜂窝
准静态压缩
数值模拟
试验对比
Reinforced honeycomb
Quasi⁃static compression
Numerical simulation
Test comparison
