Yielding of tantalum at strain rates up to 10{sup 9 }s{sup −1}

doi:10.1063/1.4960796

Title: Yielding of tantalum at strain rates up to 10{sup 9 }s{sup −1}

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Abstract

We have used a 45 μJ laser pulse to accelerate the free surface of fine-grained tantalum films up to peak velocities of ∼1.2 km s{sup −1}. The films had thicknesses of ∼1–2 μm and in-plane grain widths of ∼75–150 nm. Using ultrafast interferometry, we have measured the time history of the velocity of the surface at different spatial positions across the accelerated region. The initial part of the histories (assumed to correspond to the “elastic precursor” observed previously) exhibited measured strain rates of ∼0.6 to ∼3.2 × 10{sup 9 }s{sup −1} and stresses of ∼4 to ∼22 GPa. Importantly, we find that elastic amplitudes exhibit little variation with strain rate for a constant peak surface velocity, even though, via covariation of the strain rate with peak surface velocity, they vary with strain rate. Furthermore, by comparison with data obtained at lower strain rates, we find that amplitudes are much better predicted by peak velocities rather than by either strain rate or sample thickness.

Authors:

Crowhurst, Jonathan C., E-mail: crowhurst1@llnl.gov; Armstrong, Michael R., E-mail: armstrong30@llnl.gov; Gates, Sean D.; Zaug, Joseph M.; Radousky, Harry B.; Teslich, Nick E. ^[1]

Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, California 94550 (United States)

Publication Date:: Mon Aug 29 00:00:00 EDT 2016

OSTI Identifier:: 22590473

Resource Type:: Journal Article

Resource Relation:: Journal Name: Applied Physics Letters; Journal Volume: 109; Journal Issue: 9; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA)

Country of Publication:: United States

Language:: English

Subject:: 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; AMPLITUDES; FILMS; INTERFEROMETRY; LASERS; PEAKS; PRESSURE RANGE GIGA PA; STRAIN RATE; STRAINS; STRESSES; SURFACES; TANTALUM; THICKNESS; VELOCITY

Citation Formats


                    Crowhurst, Jonathan C., E-mail: crowhurst1@llnl.gov, Armstrong, Michael R., E-mail: armstrong30@llnl.gov, Gates, Sean D., Zaug, Joseph M., Radousky, Harry B., and Teslich, Nick E.. Yielding of tantalum at strain rates up to 10{sup 9 }s{sup −1}.  United States: N. p., 2016. 
        Web.  doi:10.1063/1.4960796.

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                    Crowhurst, Jonathan C., E-mail: crowhurst1@llnl.gov, Armstrong, Michael R., E-mail: armstrong30@llnl.gov, Gates, Sean D., Zaug, Joseph M., Radousky, Harry B., & Teslich, Nick E.. Yielding of tantalum at strain rates up to 10{sup 9 }s{sup −1}.  United States.  doi:10.1063/1.4960796.

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                    Crowhurst, Jonathan C., E-mail: crowhurst1@llnl.gov, Armstrong, Michael R., E-mail: armstrong30@llnl.gov, Gates, Sean D., Zaug, Joseph M., Radousky, Harry B., and Teslich, Nick E.. Mon .  
        "Yielding of tantalum at strain rates up to 10{sup 9 }s{sup −1}".  United States.  
        doi:10.1063/1.4960796.

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@article{osti_22590473,

  title        = {Yielding of tantalum at strain rates up to 10{sup 9 }s{sup −1}},

  author       = {Crowhurst, Jonathan C., E-mail: crowhurst1@llnl.gov and Armstrong, Michael R., E-mail: armstrong30@llnl.gov and Gates, Sean D. and Zaug, Joseph M. and Radousky, Harry B. and Teslich, Nick E.},

  abstractNote = {We have used a 45 μJ laser pulse to accelerate the free surface of fine-grained tantalum films up to peak velocities of ∼1.2 km s{sup −1}. The films had thicknesses of ∼1–2 μm and in-plane grain widths of ∼75–150 nm. Using ultrafast interferometry, we have measured the time history of the velocity of the surface at different spatial positions across the accelerated region. The initial part of the histories (assumed to correspond to the “elastic precursor” observed previously) exhibited measured strain rates of ∼0.6 to ∼3.2 × 10{sup 9 }s{sup −1} and stresses of ∼4 to ∼22 GPa. Importantly, we find that elastic amplitudes exhibit little variation with strain rate for a constant peak surface velocity, even though, via covariation of the strain rate with peak surface velocity, they vary with strain rate. Furthermore, by comparison with data obtained at lower strain rates, we find that amplitudes are much better predicted by peak velocities rather than by either strain rate or sample thickness.},

  doi          = {10.1063/1.4960796},

  journal      = {Applied Physics Letters},

  number       = 9,

  volume       = 109,

  place        = {United States},

  year         = {Mon Aug 29 00:00:00 EDT 2016},

  month        = {Mon Aug 29 00:00:00 EDT 2016}

}

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DOI: 10.1063/1.4960796

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Yielding of tantalum at strain rates up to 10 ⁹ s ⁻¹

Crowhurst, Jonathan C. ; Armstrong, Michael R. ; Gates, Sean D. ; ... - Applied Physics Letters
Cited by 2
DOI: 10.1063/1.4960796
Yielding of tantalum at strain rates up to 10 ⁹ s ^–1

Crowhurst, Jonathan C. ; Armstrong, Michael R. ; Gates, Sean D. ; ... - Applied Physics Letters

Here, we have used a 45 μJ laser pulse to accelerate the free surface of fine-grained tantalum films up to peak velocities of ~1.2 km s ^–1. The films had thicknesses of ~1–2 μm and in-plane grain widths of ~75–150 nm. Using ultrafast interferometry, we have measured the time history of the velocity of the surface at different spatial positions across the accelerated region. The initial part of the histories (assumed to correspond to the “elastic precursor” observed previously) exhibited measured strain rates of ~0.6 to ~3.2 × 10 ⁹ s ^–1 and stresses of ~4 to ~22 GPa.
Cited by 2
DOI: 10.1063/1.4960796

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Ao, Tommy ; Asay, James R. ; Ding, J.L. ; ... - Journal of Applied Physics

Abstract not provided.
Representation of elevated-temperature tensile behavior of Type 304 stainless steel in a sodium environment. [(550 and 700/sup 0/C and strain rates of 3. 81 x 10/sup -6/ to 1. 90 x 10/sup -3/ s/sup -1/)]

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An analysis of tensile behavior of Type 304 stainless steel was conducted for specimens in the solution-annealed condition and after exposure to a sodium environment. The Voce equation was used to describe tensile flow curves for plastic strains above 0.005 at temperatures between 550 and 700/sup 0/C and strain rates of 3.81 x 10/sup -6/ to 1.90 x 10/sup -3/ s/sup -1/. The results show that, when compared with solution-annealed specimens, the tensile flow behavior of the sodium-exposed specimens is characterized by a higher strain-hardening rate, which decreases rapidly with an increase in flow stress. The values of the saturationmore »« less
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Constitutive model for strain rates from 10/sup -4/ to 10/sup 6/ s/sup -1/

Steinberg, D.J. ; Lund, C.M. - J. Appl. Phys.; (United States)

We have developed an addition to the Steinberg--Guinan high strain-rate constitutive model that extends its validity to strain rates as low as 10/sup -4/ s/sup -1/. With this new model, we have successfully reproduced a number of rate-dependent, shock-induced phenomena in tantalum, such as precursor on reshock, precursor decay, and shock smearing. We have also successfully calculated a plate-impact experiment at a loading stress of 230 GPa as well as extensive data for yield strength versus strain rate at room temperature and yield strength versus temperature at a strain rate of 10/sup -4/ s/sup -1/.
DOI: 10.1063/1.342968