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

doi:10.1063/1.2263426

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

Department of Mechanical Engineering

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-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 language	English
Title of host publication	SHOCK COMPRESSION OF CONDENSED MATTER - 2005
Subtitle of host publication	Proceedings of the Conference of the American Physical Society Topical Group on Shock Compression of Condensed Matter
Pages	733-736
Number of pages	4
DOIs	https://doi.org/10.1063/1.2263426
State	Published - 1 Dec 2006
Event	SHOCK 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 2005 → 5 Aug 2005

Publication series

Name	AIP Conference Proceedings
Volume	845 I
ISSN (Print)	0094-243X
ISSN (Electronic)	1551-7616

Conference

Conference	SHOCK COMPRESSION OF CONDENSED MATTER - 2005: Proceedings of the Conference of the American Physical Society Topical Group on Shock Compression of Condensed Matter
Country/Territory	United States
City	Baltimore, MD
Period	31/07/05 → 5/08/05

Keywords

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

ASJC Scopus subject areas

General Physics and Astronomy

Access to Document

10.1063/1.2263426

Cite this

Herrmann, B., Favorsky, V., Zaretsky, E., & Shvarts, D. (2006). Critical plastic strain as a criterion for failure in ballistic impact experiments of U/Ti and Ti64 alloys. In SHOCK COMPRESSION OF CONDENSED MATTER - 2005: Proceedings of the Conference of the American Physical Society Topical Group on Shock Compression of Condensed Matter (pp. 733-736). (AIP Conference Proceedings; Vol. 845 I). https://doi.org/10.1063/1.2263426

Herrmann, B. ; Favorsky, V. ; Zaretsky, E. et al. / Critical plastic strain as a criterion for failure in ballistic impact experiments of U/Ti and Ti64 alloys. SHOCK COMPRESSION OF CONDENSED MATTER - 2005: Proceedings of the Conference of the American Physical Society Topical Group on Shock Compression of Condensed Matter. 2006. pp. 733-736 (AIP Conference Proceedings).

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

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{\texttrademark} 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{\texttrademark} 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.",

keywords = "Adiabatic shear bands, Ballistic impact, Light-gas gun, Ti64, U/Ti, VISAR",

author = "B. Herrmann and V. Favorsky and E. Zaretsky and D. Shvarts",

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language = "English",

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booktitle = "SHOCK COMPRESSION OF CONDENSED MATTER - 2005",

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Herrmann, B, Favorsky, V, Zaretsky, E & Shvarts, D 2006, Critical plastic strain as a criterion for failure in ballistic impact experiments of U/Ti and Ti64 alloys. in SHOCK COMPRESSION OF CONDENSED MATTER - 2005: Proceedings of the Conference of the American Physical Society Topical Group on Shock Compression of Condensed Matter. AIP Conference Proceedings, vol. 845 I, pp. 733-736, SHOCK 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, 31/07/05. https://doi.org/10.1063/1.2263426

Critical plastic strain as a criterion for failure in ballistic impact experiments of U/Ti and Ti64 alloys. / Herrmann, B.; Favorsky, V.; Zaretsky, E. et al.
SHOCK COMPRESSION OF CONDENSED MATTER - 2005: Proceedings of the Conference of the American Physical Society Topical Group on Shock Compression of Condensed Matter. 2006. p. 733-736 (AIP Conference Proceedings; Vol. 845 I).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

TY - GEN

T1 - Critical plastic strain as a criterion for failure in ballistic impact experiments of U/Ti and Ti64 alloys

AU - Herrmann, B.

AU - Favorsky, V.

AU - Zaretsky, E.

AU - Shvarts, D.

PY - 2006/12/1

Y1 - 2006/12/1

N2 - 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.

AB - 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.

KW - Adiabatic shear bands

KW - Ballistic impact

KW - Light-gas gun

KW - Ti64

KW - U/Ti

KW - VISAR

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M3 - Conference contribution

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SN - 0735403414

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ER -

Herrmann B, Favorsky V, Zaretsky E, Shvarts D. Critical plastic strain as a criterion for failure in ballistic impact experiments of U/Ti and Ti64 alloys. In SHOCK COMPRESSION OF CONDENSED MATTER - 2005: Proceedings of the Conference of the American Physical Society Topical Group on Shock Compression of Condensed Matter. 2006. p. 733-736. (AIP Conference Proceedings). doi: 10.1063/1.2263426

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

Abstract

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Keywords

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