摘要
研究由开孔聚合物和金属/聚合物泡沫芯制成的轻质夹层板的力学性能和能量吸收性能。通过结合聚合物树脂的增材制造和三层金属(Ni/Ni-Cu/Ni)的电沉积制备多层夹层板,每英寸孔数(PPI)为4、5和6。测试样品在单轴压缩变形过程中的屈服强度,计算其能量吸收密度、互补能和比吸收能(SEA)。结果表明,与相同厚度的纯Ni和Cu夹层板相比,复合夹层板的性能有明显改善。增加PPI和金属层可提高力学性能和能量吸收性能,当PPI为6时,屈服强度(能量吸收密度)由聚合物夹层板的0.12 MPa(0.12MJ/m^(3))提高到三层金属夹层板的1.83MPa(0.67 MJ/m^(3))。对夹层板结构归一化能量的研究表明,夹层板具有可预测的塑性变形行为,多金属层改善了新型夹层板的力学性能。其能量吸收性能的显著增强可保证材料在不同行业的独特应用。
This investigation aims to assess the mechanical and energy absorption properties of the light sandwich panel portions made of open-cell polymer and metal/polymer foam cores.These multi-layered sandwich panels were produced by additive manufacturing of polymeric resin and electrodeposition of three layers of metals,Ni/Ni−Cu/Ni,with 4,5,and 6 pores per inch(PPI).The yield strength,energy absorption density,complementary energy,and specific energy absorption(SEA)were measured during uniaxial compression deformation.The results indicate that compared with pure Ni and Cu sandwich panel portions with the same thickness,the abovementioned properties of the sandwich panels had a noteworthy improvement.Mechanical and energy absorption properties were improved by increasing the PPI and the presence of metallic layers.In a sandwich panel with 6 PPI,the yield strength(energy absorption density)was improved from 0.12 MPa(0.12 MJ/m^(3))for the polymeric sandwich panel to 1.83 MPa(0.67 MJ/m^(3))for the metallic sandwich panel.Investigations on normalized energies of these structures show a predictable behavior for these sandwich panels during plastic deformations.The results show that the multi metallic layers improved the mechanical behavior of these novel sandwich panels.Noticeable enhancement of the calculated properties of these advanced materials guarantees their unique application in variable industries.
基金
the financial supported from Rahyaft Advanced Sciences & Technologies knowledge-based company (No. RNAST.Co: 2021020713991115)。
关键词
夹层板
能量吸收
金属泡沫
Voronoi结构
增材制造
金属电层级
sandwich panel
energy absorption
metal foam
Voronoi structures
additive manufacturing
electroforming of metal
