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Title: Strain fields induced by kink band propagation in Cu-Nb nanolaminate composites

Kink band formation is a common deformation mode for anisotropic materials and has been observed in polymer matrix fiber composites, single crystals, geological formations, and recently in metallic nanolaminates. While numerous studies have been devoted to kink band formation, the majority do not consider the often rapid and unstable process of kink band propagation. In this paper, we take advantage of stable kink band formation in Cu-Nb nanolaminates to quantitatively map the local strain fields surrounding a propagating kink band during uniaxial compression. Kink bands are observed to initiate at specimen edges, propagate across the sample during a rising global stress, and induce extended strain fields in the non-kinked material surrounding the propagating kink band. Finally, it is proposed that these stress/strain fields significantly contribute to the total energy dissipated during kinking and, analogous to crack tip stress/strain fields, influence the direction of kink propagation and therefore the kink band inclination angle.
Authors:
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Publication Date:
Report Number(s):
LA-UR-17-20721
Journal ID: ISSN 1359-6454
Grant/Contract Number:
AC52-06NA25396; 12-LR-238091
Type:
Accepted Manuscript
Journal Name:
Acta Materialia
Additional Journal Information:
Journal Volume: 133; Journal Issue: C; Journal ID: ISSN 1359-6454
Publisher:
Elsevier
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE Office of Science (SC); USDOD; Univ. of California, Santa Barbara, CA (United States)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; kink bands, nanolaminates, digital image correlation
OSTI Identifier:
1356148