Strain fields induced by kink band propagation in Cu-Nb nanolaminate composites
Journal Article
·
· Acta Materialia
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.
- Research Organization:
- Los Alamos National Laboratory (LANL)
- Sponsoring Organization:
- Dept. of Defense (DOD) (United States); USDOE Office of Science (SC); Univ. of California, Santa Barbara, CA (United States)
- Grant/Contract Number:
- AC52-06NA25396
- OSTI ID:
- 1356148
- Report Number(s):
- LA-UR-17-20721
- Journal Information:
- Acta Materialia, Journal Name: Acta Materialia Journal Issue: C Vol. 133; ISSN 1359-6454
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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