Abstract
Understanding the correlation between cell deformation and initial cell structure during compression is important for improvement and development of effective applications of aluminum foams. Foams with porosities lower than 75% now get more attention because of more spherical cells and better mechanical performance. Herein, two low porosity aluminum foam samples are deformed by a compressive device allowing simultaneous X‐ray tomography. The foam cell structures in the initial undeformed state and in the state, where the first batch of cells deforms, are characterized and correlated. The absolute value of anisotropy change is selected as the most sensitive parameter to evaluate the cell deformation. A fitting formula between the cell deformation degree and the initial cell parameters is obtained, which can predict the cell deformation degree. It is found that a cell with small anisotropy, large angle between the longest axis of the cell and the loading direction, small sphericity, more neighbors, and large cell size is more prone to deform during compression. With the fitting formula, the weakest region where the first batch of deformed cells occurs can be predicted. The influence of cell morphology parameters in low porosity aluminum foams is significant and verified by experimental results.
Highlights
Understanding the correlation between cell deformation and initial cell structure of base alloys, the counterpart of the during compression is important for improvement and development of effective mechanical properties at cell level is the cell applications of aluminum foams
The influence of an individual cell structure should be considered for these low porosity aluminum foams (
1) The detailed cell structure information of the studied aluminum foams at different stages of compression was obtained by a compressive test with complementary X-ray tomography
Summary
Understanding the correlation between cell deformation and initial cell structure of base alloys, the counterpart of the during compression is important for improvement and development of effective mechanical properties at cell level is the cell applications of aluminum foams. X-ray tomography makes it possible to obtain the 3D cell structure of aluminum foam non-destructively.[8,9] If the cell deformation and failure can be predicted by the initial cell structure, an structures in the initial undeformed state and in the state, where the first batch of optimized direction of foam structure cells deforms, are characterized and correlated. It is found that a cell with small anisotropy, large angle between the longest axis of the cell the mechanical properties could be improved.[10,11,12] the first failure region of an aluminum foam piece could be known in advance[13] and prevented through reinforcement, which is significant and the loading direction, small sphericity, more neighbors, and large cell size is for applications. Digital image correlation (DIC) is a powerful tool to measure the strain evolution of specimen surface.[16,17] Sun et al.[18]
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