Spall behavior and damage evolution in tantalum

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Description

The authors conducted a number of plate impact experiments using an 80-mm launcher to study dynamic void initiation, linkup, and spall in tantalum. The tests ranged in shock pressure so that the transition from void initiation, incipient spall, and full spall could be studied. Wave profiles were measured using a velocity interferometry system (VISAR), and targets were recovered using soft recovery techniques. The authors utilized scanning electron microscopy, metallographic cross-sections, and plateau etching to obtain quantitative information concerning damage evolution in tantalum under spall conditions. The data (wave profiles and micrographs) are analyzed in terms of a new theory and ... continued below

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5 p.

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Zurek, A.K.; Thissell, W.R. & Tonks, D.L. September 1, 1995.

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Description

The authors conducted a number of plate impact experiments using an 80-mm launcher to study dynamic void initiation, linkup, and spall in tantalum. The tests ranged in shock pressure so that the transition from void initiation, incipient spall, and full spall could be studied. Wave profiles were measured using a velocity interferometry system (VISAR), and targets were recovered using soft recovery techniques. The authors utilized scanning electron microscopy, metallographic cross-sections, and plateau etching to obtain quantitative information concerning damage evolution in tantalum under spall conditions. The data (wave profiles and micrographs) are analyzed in terms of a new theory and model of dynamic damage cluster growth. They have developed a model of ductile damage based on void coalescence of initially nucleated voids, that leads to clusters of voids. At low loading strain rates, the biggest cluster has time to grow much more rapidly than smaller clusters to break the sample. At high loading strain rates, large clusters cannot grow any faster than smaller clusters so the sample breaks when enough clusters grow independently to form a fracture surface by random accumulation.

Physical Description

5 p.

Notes

INIS; OSTI as DE96000018

Source

  • 15. Association for the International Advancement of High Pressure & Technology international conference, Warsaw (Poland), 11-15 Sep 1995

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  • Other: DE96000018
  • Report No.: LA-UR--95-2992
  • Report No.: CONF-9509226--4
  • Grant Number: W-7405-ENG-36
  • DOI: 10.2172/113961 | External Link
  • Office of Scientific & Technical Information Report Number: 113961
  • Archival Resource Key: ark:/67531/metadc624333

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Office of Scientific & Technical Information Technical Reports

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

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  • September 1, 1995

Added to The UNT Digital Library

  • June 16, 2015, 7:43 a.m.

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  • April 21, 2016, 10:28 p.m.

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Zurek, A.K.; Thissell, W.R. & Tonks, D.L. Spall behavior and damage evolution in tantalum, report, September 1, 1995; New Mexico. (digital.library.unt.edu/ark:/67531/metadc624333/: accessed June 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.