Virtual melting as a new mechanism of stress relaxation under high strain rate loading

dc.contributor.author Levitas, Valery
dc.contributor.author Ravelo, Ramon
dc.contributor.author Levitas, Valery
dc.contributor.department Aerospace Engineering
dc.contributor.department Ames Laboratory
dc.contributor.department Mechanical Engineering
dc.contributor.department Materials Science and Engineering
dc.date 2018-02-19T01:17:15.000
dc.date.accessioned 2020-06-29T22:45:13Z
dc.date.available 2020-06-29T22:45:13Z
dc.date.copyright Sun Jan 01 00:00:00 UTC 2012
dc.date.issued 2012-01-01
dc.description.abstract <p>Generation and motion of dislocations and twinning are the main mechanisms of plastic deformation. A new mechanism of plastic deformation and stress relaxation at high strain rates (109–1012 s-1) is proposed, under which virtual melting occurs at temperatures much below the melting temperature. Virtual melting is predicted using a developed, advanced thermodynamic approach and confirmed by large-scale molecular dynamics simulations of shockwave propagation and quasi-isentropic compression in both single and defective crystals. The work and energy of nonhydrostatic stresses at the shock front drastically increase the driving force for melting from the uniaxially compressed solid state, reducing the melting temperature by 80% or 4,000 K. After melting, the relaxation of nonhydrostatic stresses leads to an undercooled and unstable liquid, which recrystallizes in picosecond time scales to a hydrostatically loaded crystal. Characteristic parameters for virtual melting are determined from molecular dynamics simulations of Cu shocked/compressed along the and directions and Al shocked/compressed along the direction.</p>
dc.description.comments <p>This article is published as Levitas, Valery I., and Ramon Ravelo. "Virtual melting as a new mechanism of stress relaxation under high strain rate loading." Proceedings of the National Academy of Sciences 109, no. 33 (2012): 13204-13207. <a href="http://dx.doi.org/10.1073" target="_blank">10.1073/pnas.1203285109</a>. Posted with permission.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/aere_pubs/100/
dc.identifier.articleid 1101
dc.identifier.contextkey 10984499
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath aere_pubs/100
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/1942
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/aere_pubs/100/2012_Levitas_VirtualMelting.pdf|||Fri Jan 14 18:11:50 UTC 2022
dc.source.uri 10.1073/pnas.1203285109
dc.subject.disciplines Aerospace Engineering
dc.subject.disciplines Structures and Materials
dc.subject.keywords high strain-rate plasticity
dc.subject.keywords relaxation of non-hydrostatic stresses
dc.subject.keywords thermodynamics under uniaxial straining
dc.title Virtual melting as a new mechanism of stress relaxation under high strain rate loading
dc.type article
dc.type.genre article
dspace.entity.type Publication
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