Correlation between cell wall buckling and deformation banding in a closed-cell foam

SCRIPTA MATERIALIA

卷:170

Article

Chai, H. W.¹  Li, H. Y.^2,3  Xiao, X. H.⁴  Huang, J. Y.^1,2,3  Luo, S. N.^1,2,3 

[1] Peac Inst Multiscale Sci, Chengdu 610031, Sichuan, Peoples R China

[2] Southwest Jiaotong Univ, Minist Educ, Key Lab Adv Technol Mat, Chengdu 610031, Sichuan, Peoples R China

[3] Southwest Jiaotong Univ, Inst Mat Dynam, Chengdu 610031, Sichuan, Peoples R China

[4] Argonne Natl Lab, Adv Photon Source, 9700 S Cass Ave, Argonne, IL 60439 USA

关键词: X-ray tomography;    Closed-cell foam;    Deformation banding;    Microstructural evolution;   

DOI  :  10.1016/j.scriptamat.2019.06.006

来源: Elsevier

【 摘 要 】

We investigate deformation dynamics in a widely used closed-cell foam of polymethacrylimide under uniaxial compression with in situ X-ray computed tomography and digital volume correlation. Axial strain mapping demonstrates discrete deformation bands nucleated in sequence across the sample. A buckling strength index is proposed to quantify the buckling resistance of cell walls, based on their morphology extracted via an edge-segmentation procedure developed in this work. The spatial distribution of the weakest cell walls is correlated well with the location and nucleation sequence of deformation bands, and can be used for predicting deformation banding. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

Free