Improved technique for determining dynamic material properties using the expanding ring

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Since its introduction nearly two decades ago, the expanding ring test has shown considerable promise as a simple method of obtaining strain-rate-sensitive uniaxial material property data. The procedure is to monitor the kinematics of a uniformly expanding ring. The stress-strain-strain rate response of the ring material can then be calculated from the ring equation of motion and the recorded data. Efforts in the past have been based upon recording the transient displacement of the ring. Determination of the stress in the ring then required double differentiation with respect to time of the ring displacement. The work reported herein is an ... continued below

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Pages: 15

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Warnes, R.H.; Duffey, T.A.; Karpp, R.R. & Carden, A.E. January 1, 1980.

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Description

Since its introduction nearly two decades ago, the expanding ring test has shown considerable promise as a simple method of obtaining strain-rate-sensitive uniaxial material property data. The procedure is to monitor the kinematics of a uniformly expanding ring. The stress-strain-strain rate response of the ring material can then be calculated from the ring equation of motion and the recorded data. Efforts in the past have been based upon recording the transient displacement of the ring. Determination of the stress in the ring then required double differentiation with respect to time of the ring displacement. The work reported herein is an attempt to overcome this difficulty by directly measuring ring velocity as a function of time by means of a laser velocity interferometer; this method requires one less differentiation of the data. The procedure is illustrated by experiments performed on annealed and hardened copper rings. Results are compared to quasi-static material properties determined for the same materials using conventional techniques.

Physical Description

Pages: 15

Notes

NTIS, PC A02/MF A01.

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  • International conference on the metallurgical effects of high strain rate deformation and fabrication, Albuquerque, NM, USA, 22 Jun 1980

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  • Report No.: LA-UR-80-1543
  • Report No.: CONF-800641-1
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 5349061
  • Archival Resource Key: ark:/67531/metadc1064597

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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.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • January 1, 1980

Added to The UNT Digital Library

  • Feb. 4, 2018, 10:51 a.m.

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  • May 30, 2018, 12:42 p.m.

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Warnes, R.H.; Duffey, T.A.; Karpp, R.R. & Carden, A.E. Improved technique for determining dynamic material properties using the expanding ring, article, January 1, 1980; New Mexico. (digital.library.unt.edu/ark:/67531/metadc1064597/: accessed October 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.