Heterogeneity in deformation of granular ceramics under dynamic loading

SCRIPTA MATERIALIA

卷:111

Article

Huang, J. Y.^1,2,3  Lu, L.^1,3  Fan, D.³  Sun, T.⁴  Fezzaa, K.⁴  Xu, S. L.¹  Zhu, M. H.²  Luo, S. N.^2,3 

[1] Univ Sci & Technol China, Dept Modern Mech, CAS Key Lab Mat Behav & Design, Hefei 230027, Anhui, Peoples R China

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

[3] Peac Inst Multiscale Sci, Chengdu 610207, Sichuan, Peoples R China

[4] Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA

关键词: Powder processing;    Dynamic compaction;    X-ray imaging;    Digital image correlation;    Heterogeneous deformation;   

DOI  :  10.1016/j.scriptamat.2015.08.028

来源: Elsevier

【 摘 要 】

Dynamic compression experiments are conducted on micron-sized SiC powders of different initial densities with a split Hopkinson pressure bar. Digital image correlation is applied to images from high-speed X-ray phase contrast imaging to map dynamic strain fields. The X-ray imaging and strain field mapping demonstrate the degree of heterogeneity in deformation depends on the initial powder density; mesoscale strain field evolution is consistent with softening or hardening manifested by bulk-scale loading curves. Statistical analysis of the strain probability distributions exhibits exponential decay tail similar to those of contact forces, which are supposed to lead to the grain-scale heterogeneity of granular materials. (c) 2015 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

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