Critical plastic strain as a criterion for failure in ballistic impact experiments of U/Ti and Ti64 alloys

B. Herrmann, V. Favorsky, E. Zaretsky, D. Shvarts

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Strain localization and failure in U-0.75Ti and Ti-6Al-4V alloys were studied in symmetric (rod-on-rod) and reverse ballistic (disk-on-rod) impact experiments, accompanied by VISAR monitoring of the lateral sample surface velocity. Softly-recovered samples were metallurgically examined, and the experiments were numerically simulated using an AUTODYN™ 2-D code. Satisfactory reproduction of both the measured velocity profiles and the results of metallographic examination of the damage produced by adiabatic shearing were obtained by using the Steinberg-Cochran-Guinan-type constitutive equation (calibrated in preliminary planar impact experiments) and the AUTODYN™ built-in erosion function. A good agreement was found between strains, measured by using natural markers (martensite in U/Ti and texture in Ti64), corresponding to the onset of adiabatic shearing (0.5 - 1.0) and the value of the critical plastic strain used in the simulations as a criterion for triggering the erosion function (0.6 for both alloys). In the case of Ti64 the shearing is finalized by cracking at observed strain values of 1.0 - 1.5, whereas in the U/Ti the shear strain reaches values greater by at least one order of magnitude and is terminated by void growth and coalescence.

Original languageEnglish
Title of host publicationSHOCK COMPRESSION OF CONDENSED MATTER - 2005
Subtitle of host publicationProceedings of the Conference of the American Physical Society Topical Group on Shock Compression of Condensed Matter
Pages733-736
Number of pages4
DOIs
StatePublished - 1 Dec 2006
EventSHOCK COMPRESSION OF CONDENSED MATTER - 2005: Proceedings of the Conference of the American Physical Society Topical Group on Shock Compression of Condensed Matter - Baltimore, MD, United States
Duration: 31 Jul 20055 Aug 2005

Publication series

NameAIP Conference Proceedings
Volume845 I
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Conference

ConferenceSHOCK COMPRESSION OF CONDENSED MATTER - 2005: Proceedings of the Conference of the American Physical Society Topical Group on Shock Compression of Condensed Matter
Country/TerritoryUnited States
CityBaltimore, MD
Period31/07/055/08/05

Keywords

  • Adiabatic shear bands
  • Ballistic impact
  • Light-gas gun
  • Ti64
  • U/Ti
  • VISAR

ASJC Scopus subject areas

  • Physics and Astronomy (all)

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