Simulation of Effect of Loading Rate on Compression Properties in the Two-Dimensional Model of Aluminum Foam Sandwich Panels

Abstract

This paper has been retracted from Mater. Trans. by the authors request due to the following reason.Firstly, we made a preliminary estimate on the density (ρ 0 ) of AFS panels before the plastic wave because we did not fully understand the property of AFS panels, which made the calculation results according to the value of the density (ρ 0 ) of AFS panels, that was wrong in the paper. For example, the locking density (ρ 1 ) of AFS panels with relative density 0.3 in Table 2 were incorrect, according to the following formula:Especially the further research results (unpublished) in the subsequent study have con ict with the above-mentioned results in the work. Secondly, with the increase of loading rate, the stress of bottom of AFS panels increases in the process of compression. However, the impact stress of loading surface is only analyzed and it is not accurate for the explanation of the mechanism for the stress of bottom of AFS panels. In addition, under the loading rate 0.01 m/s, the stress-strain curve of AFS panels are stated in the paper. However, the corresponding mechanism cannot explain the stress-strain curve of AFS panels under the loading rate 0.01 m/s. All of these could mislead the readers. At last, the withdrawal is meaningful for the preciseness of our work, and it is helpful for the subsequent research of AFS panels. A two-dimensional finite element model of aluminum foam sandwich (AFS) panels was approximated by combing C++ and ANSYS/LS-DYNA software to represent the shapes of the cells and geometric distributions. Under different loading rates, the deformation behavior, shock wave propagation process, inertial effect and stress of the bottom of the model of AFS panels are discussed resulting from simulation. We found that plastic deformation in the model first occurs in a weak section in the quasi-static compression simulation, whereas the local densification is obvious during the high-speed impact process. The results also indicate that the speed of the plastic wave, locking density and locking strain increase respectively with increasing loading rate. In addition, under the loading rate 80 m/s, the model can be compressed after the plastic wave reaches the bottom of the model during the process of deformation due to the reflection of the plastic wave, whereas the plateau stress rises with an increase in the loading rate.

Basalt fiber reinforced porous expanded polystyrene-ceramsite concrete wrapped with a brass strip

“…8. The relationship between critical strain and average strain rate can be expressed as the empirical formulas in eqn (5) and (6). Fig.…”

“…The fundamental difference between porous materials and normal materials lies in the beehive-like holes, which give porous materials high plasticity. 5 So far, almost all the attention paid to the researches of porous materials focuses on foamed aluminum 6 and polymer materials. 7 However, these materials cannot meet the requirements of defensive engineering for the plasticity and strength.…”