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Ultralight X-type lattice sandwich structure (Ⅱ):Micromechanics modeling and finite element analysis

science China(Technological sciences) 2009年第9期52卷 2670-2680页

作者： zhang qiancheng1,chen aiping 2.chen changqing2.3 & lu tianjian2.1 state key laboratory for mechanical behavior of materials,{2.,xi’an jiaotong university,xi’an 710049,China 2.MOE key laboratory for Strength and Vibration,school of Aerospace,xi’an jiaotong university,xi’an 710049,China 3 Department of engineering Mechanics,AML,Tsinghua university,Beijing 100084,China state key {2. for {2. behavior of materials School of Material Science and Engineering Xi’an Jiaotong University Xi’an China MOE key laboratory for Strength and Vibration School of Aerospace Xi’an Jiaotong University Xi’an China Department of engineering Mechanics AML Tsinghua University Beijing China

The methods of homogenization and finite elements are employed to predict the effective elastic constants and stress-strain responses of a new type of lattice structure,the X-structure proposed by the authors in a companion paper. It is shown that in most cases the predictions by the equivalent homogenization theory agree well with the experimental and 3-dimensional finite element calculated results. The theoretical and numerical study supports the argument that the X-structure is superior to the pyramid lattice structure in terms of mechanical strength.

关键词： sandwich panel lattice structure equivalent homogenization finite element model

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Ultralight X-type lattice sandwich structure(I):Concept,fabrication and experimental characterization

引用

science China(Technological sciences) 2009年第8期52卷 2147-2154页

作者： zhang qiancheng HAN YunJie {2. changqing lu tianjian state key {2. for {2. behavior of materials School of Material Science and EngineeringXi’an Jiaotong UniversityXi’an 710049China MOE key laboratory for Strength and Vibration School of AerospaceXi’an Jiaotong UniversityXi’an 710049China Department of engineering Mechanics AMLTsinghua UniversityBeijing 100084China

A new type of ultra-lightweight metallic lattice structure (named as the X-type structure) is reported. This periodic structure was formed by two groups of staggered struts in the traditional pyramid structure, and fabricated by folding expanded metal sheet along rows of offset nodes and then brazing the folded structure (as the core) with top and bottom facesheets to form sandwich panels. The out-of-plane compressive and shear properties of the X-type lattice sandwich structure were investigated experimentally and compared to those of the sandwich having a pyramidal truss core. It is found that the formation of the 2.dimensional staggered nodes can effectively make the X-type structure more resistant to inelastic and plastic buckling under both compression and shear loading than the pyramidal lattice truss. Obtained results show that the compressive and shear peak strengths of the X-type lattice structure are about 30% higher than those of the pyramidal lattice truss having the same relative density.

关键词： sandwich panel lattice structure X-type structure brazing plastic yielding

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