Ductile damage evolution and experimental simulation under high rates of strain in 10100 copper.

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The high strain-rate damage evolution and Eracture behavior of half-hard 10 LOO Cu was investigated by experiments and computer simulations. Testing of uniaxial stress and axisymmetric notched bars of the Hancock-Mackenzie geometries were performetl using a momentum trapped tensile split Hopkinson pressure bar. Specimens were. tested to fracture and to several stages of incipient failure prior to fracture. Recovered specimens were sectioned and metallographically examined using image analysis and optical profilornelry to quantify the resulting damage. The quantified damage is described by spatially resolved porosity distributions, spatially resolved volumetric number densiries, and spatia Ily resolved void size distributions. Concurrent to ... continued below

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3 p.

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Thissell, W. R. (W. Richards); McKirgan, J. B. (John B.); Chen, S. R. (Shuh-Rong); Trujillo, C. P. (Carl P.) & Macdougall, D. A. S. (Duncan A. S.) January 1, 2001.

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Description

The high strain-rate damage evolution and Eracture behavior of half-hard 10 LOO Cu was investigated by experiments and computer simulations. Testing of uniaxial stress and axisymmetric notched bars of the Hancock-Mackenzie geometries were performetl using a momentum trapped tensile split Hopkinson pressure bar. Specimens were. tested to fracture and to several stages of incipient failure prior to fracture. Recovered specimens were sectioned and metallographically examined using image analysis and optical profilornelry to quantify the resulting damage. The quantified damage is described by spatially resolved porosity distributions, spatially resolved volumetric number densiries, and spatia Ily resolved void size distributions. Concurrent to mechanical testing, explicit finite element simulations of the tensile split Hopkinson pressure bar experiments were perfornicd to quantify the local stress-state and strain-state within the material and to determine the evolution of damage within the notch region. The coinpressive plasticity behavior of the material was fit to the mechanical threshold stress constitutive model, and was used in the simulations. The quantified damage was coniprued with damage model (TEPLA) predictions and used to refine model parameters and damage nucleation criteria. The simulation results also show that the maximum stress triaxiality in the specimens quickly enlarges after the onset of plastic flow or tensile instability to almost twice that of the Bridgman predicted levels.

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3 p.

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  • Submitted to: Plasticity 2002

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  • Report No.: LA-UR-01-5982
  • Grant Number: none
  • Office of Scientific & Technical Information Report Number: 975842
  • Archival Resource Key: ark:/67531/metadc928166

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • January 1, 2001

Added to The UNT Digital Library

  • Nov. 13, 2016, 7:26 p.m.

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  • Dec. 12, 2016, 3:49 p.m.

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Thissell, W. R. (W. Richards); McKirgan, J. B. (John B.); Chen, S. R. (Shuh-Rong); Trujillo, C. P. (Carl P.) & Macdougall, D. A. S. (Duncan A. S.). Ductile damage evolution and experimental simulation under high rates of strain in 10100 copper., article, January 1, 2001; United States. (digital.library.unt.edu/ark:/67531/metadc928166/: accessed November 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.