The Impala's horn applied to posterior samples of Ti-6Al-4V strength model parameters

Technical Report · Thu Mar 04 04:00:00 EST 2021

DOI:https://doi.org/10.2172/1770086· OSTI ID:1770086

Sjue, Sky K. ^[1]; Biswas, Ayan ^[1]; Francom, Devin Craig ^[1]; Luscher, Darby Jon ^[1]; Plohr, JeeYeon Nam ^[1]; Walters, David J. ^[1]

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1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

We have generated strength model parameters for the Preston-Tonks-Wallace (PTW) model of plastic deformation based on a collection of Ti-6Al-4V alloy data and a Bayesian framework. This data collected from the literature includes different chemistries and processes. The experiments include quasistatic compression, Split Hopkinson Pressure Bar (SHPB) compression, and Taylor cylinders. Here we use posterior parameter distributions applied to a hypothetical impact referred to as the Impala's horn. The Impala's horn is like a Taylor cylinder, but modified to have a conical pro le that is truncated before coming to a point. The smaller diameter at the impact end results in higher calculated strain rates and strains than the same velocity impact with the traditional Taylor profile. The modified geometry exercises the behavior of the strength model outside the range of conditions found in the calibration data. Here we sort posterior strength models based on their flow stress at characteristic values for this hypothetical deformation. Then we compare the performance of these posterior models based on two simple observable final state properties of the Impala's horn.

• Research Organization: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
• Sponsoring Organization: USDOE National Nuclear Security Administration (NNSA)
• DOE Contract Number: 89233218CNA000001
• OSTI ID: 1770086
• Report Number(s): LA-UR--21-22189
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE