Final Report Auto/Steel Partnership Phase II

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This is the final report in which effects of strain-rate, temperature, and stress-state on the yield stress and the strain hardening behavior of many common steels used in automobile construction were investigated. The yield and flow stresses were found to exhibit very high rate sensitivities for most of the steels while the hardening rates were found to be insensitive to strain rate and temperature at lower temperatures or at higher strain rates. This behavior is consistent with the observation that overcoming the intrinsic Peierls stress is shown to be the rate-controlling mechanism in these materials at low temperatures. The dependence ... continued below

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Cady, C.M.; Chen, S.R. & Gray, G.T. III June 9, 1999.

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Description

This is the final report in which effects of strain-rate, temperature, and stress-state on the yield stress and the strain hardening behavior of many common steels used in automobile construction were investigated. The yield and flow stresses were found to exhibit very high rate sensitivities for most of the steels while the hardening rates were found to be insensitive to strain rate and temperature at lower temperatures or at higher strain rates. This behavior is consistent with the observation that overcoming the intrinsic Peierls stress is shown to be the rate-controlling mechanism in these materials at low temperatures. The dependence of the yield stress on temperature and strain rate was found to decrease while the strain hardening rate increased. The Mechanical Threshold Stress (MTS) model was adopted to model the stress-strain behavior of the steels. Parameters for the constitutive relations were derived for the MTS model and also for the Johnson-Cook (JC) and the Zerilli-Armstrong (ZA) models. The results of this study substantiate the applicability of these models for describing the high strain-rate deformation of these materials. The JC and ZA models, however, due to their use of a power strain hardening law were found to yield constitutive relations for the materials which are strongly dependent on the range of strains for which the models were optimized.

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Medium: P; Size: vp.

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OSTI as DE00759187

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  • Other Information: PBD: 9 Jun 1999

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  • Report No.: LA-UR-99-2444
  • Grant Number: W-7405-ENG-36
  • DOI: 10.2172/759187 | External Link
  • Office of Scientific & Technical Information Report Number: 759187
  • Archival Resource Key: ark:/67531/metadc711167

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  • June 9, 1999

Added to The UNT Digital Library

  • Sept. 12, 2015, 6:31 a.m.

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  • March 21, 2016, 5:34 p.m.

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Cady, C.M.; Chen, S.R. & Gray, G.T. III. Final Report Auto/Steel Partnership Phase II, report, June 9, 1999; New Mexico. (digital.library.unt.edu/ark:/67531/metadc711167/: accessed October 15, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.