Studies of Shear Band Velocity Using Spatially and Temporally Resolved Measurements of Strain During Quasistatic Compression of Bulk Metallic Glass

Wright, W J; Samale, M; Hufnagel, T; LeBlanc, M; Florando, J

doi:10.1016/j.actamat.2009.06.013

Studies of Shear Band Velocity Using Spatially and Temporally Resolved Measurements of Strain During Quasistatic Compression of Bulk Metallic Glass

Journal Article · Mon Jun 15 04:00:00 EDT 2009 · Acta Materialia

DOI:https://doi.org/10.1016/j.actamat.2009.06.013· OSTI ID:964504

Wright, W J; Samale, M; Hufnagel, T; LeBlanc, M; Florando, J

We have made measurements of the temporal and spatial features of the evolution of strain during the serrated flow of Pd{sub 40}Ni{sub 40}P{sub 20} bulk metallic glass tested under quasistatic, room temperature, uniaxial compression. Strain and load data were acquired at rates of up to 400 kHz using strain gages affixed to all four sides of the specimen and a piezoelectric load cell located near the specimen. Calculation of the displacement rate requires an assumption about the nature of the shear displacement. If one assumes that the entire shear plane displaces simultaneously, the displacement rate is approximately 0.002 m/s. If instead one assumes that the displacement occurs as a localized propagating front, the velocity of the front is approximately 2.8 m/s. In either case, the velocity is orders of magnitude less than the shear wave speed ({approx}2000 m/s). The significance of these measurements for estimates of heating in shear bands is discussed.

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA

Sponsoring Organization:: USDOE

DOE Contract Number:: W-7405-ENG-48

OSTI ID:: 964504

Report Number(s):: LLNL-JRNL-413920

Journal Information:: Acta Materialia, Journal Name: Acta Materialia Journal Issue: 16 Vol. 57; ISSN 1359-6454; ISSN ACMAFD

Country of Publication:: United States

Language:: English

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Studies of Shear Band Velocity Using Spatially and Temporally Resolved Measurements of Strain During Quasistatic Compression of Bulk Metallic Glass

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