Abstract
As a material widely used in various lightweight structures and energy absorbing devices, honeycomb aluminum has high specific stiffness and specific strength, excellent energy absorption capacity, and vibration damping. When evaluating the energy absorption of honeycomb aluminum under out‐of‐plane compression, platform stress and onset strain of densification have become important parameters studied by many scholars. In this work, based on the theory that the energy absorption efficiency determines the densification onset strain, the influence of the geometric design parameters of honeycomb aluminum on the onset strain of out‐of‐plane quasi‐static compression densification is studied. Based on the results of the finite element analysis, the relationship between the onset strain and the geometric design parameters including cell size length and wall thickness is fitted by the least squares method. A linear relationship that the onset strain of densification will decrease with the increase of the reciprocal of cell side length and the onset strain of densification will decrease with the increase of the wall thickness is exhibited in the conclusion. This work can provide a theoretical basis for the calculation of the platform stress in the plastic deformation stage.
Highlights
Honeycomb material is a kind of special porous solid, which contains a large number of cavities and has a regular twodimensional porous structure. erefore, it has the advantages of low relative density, high specific strength and specific stiffness, good vibration absorption and energy absorption, and sound insulation
E in-plane and out-of-plane mechanical properties of honeycomb materials are mainly concentrated in the elastic deformation section and plastic deformation section [8, 9], while the research on the mechanical properties of the honeycomb aluminum densification stage is relatively less
With the calibrated numerical model, Wang and Liu [13] carried out extensive comparisons between mechanical performances considering the deformation modes, nominal stress, and energy absorption property in terms of honeycomb cells filled with circular aluminum tubes, conventional honeycomb, and multitubes
Summary
Honeycomb material is a kind of special porous solid, which contains a large number of cavities and has a regular twodimensional porous structure. erefore, it has the advantages of low relative density, high specific strength and specific stiffness, good vibration absorption and energy absorption, and sound insulation. The strain corresponding to the peak is defined as the onset strain of the densification point
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