Approximate solutions for dynamic plastic deformation of a tube

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The problem of determining the dynamic plastic deformation of a long, thin-walled tube or shell caused by a deliberate or accidental energy release over a small section of its interior has many practical applications. Because details of the energy release and the resulting time-dependent internal pressure distributions are not well known in most situations, parameter studies must be used to bound or approximate the distortion of the tube. Consequently, there is a need to develop methods for correlating the permanent deformation of the tube to simple parameters of the loading, without resorting to detailed solutions for numerous particular cases. This ... continued below

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Pages: 11

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Youngdahl, C.K. January 1, 1989.

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Description

The problem of determining the dynamic plastic deformation of a long, thin-walled tube or shell caused by a deliberate or accidental energy release over a small section of its interior has many practical applications. Because details of the energy release and the resulting time-dependent internal pressure distributions are not well known in most situations, parameter studies must be used to bound or approximate the distortion of the tube. Consequently, there is a need to develop methods for correlating the permanent deformation of the tube to simple parameters of the loading, without resorting to detailed solutions for numerous particular cases. This paper treats the problem of a long tube loaded by a time-dependent pressure distribution P(z,t) which is applied over a time-dependent region 2L(t). The plastic deformation is a combination of localized circumferential stretching and axial bending of the tube wall, which depend on the history of the applied force F(t) and the applied moment G(t) about z = 0 associated with the pressure distribution. The final plastic deformation depends on an effective applied force F/sub e/, an effective applied moment G/sub e/, an effective length of the loaded region 2L/sub e/, and the deformation which would be attained if the loading were applied as a pure impulse. All the effective values involve only simple integrals of the loading. Consequently, they do not depend on details of the loading functions and eliminate the need for obtaining time-dependent solutions for the deformation. 3 refs., 6 figs.

Physical Description

Pages: 11

Notes

NTIS, PC A03/MF A01 - OSTI; 1.

Source

  • 10. international conference on Structural Mechanics in Reactor Technology (SMIRT), Anaheim, CA, USA, 14-18 Aug 1989

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  • Other: DE89009783
  • Report No.: CONF-890855-14
  • Grant Number: W-31109-ENG-38
  • Office of Scientific & Technical Information Report Number: 6006348
  • Archival Resource Key: ark:/67531/metadc1099998

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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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  • January 1, 1989

Added to The UNT Digital Library

  • Feb. 18, 2018, 3:59 p.m.

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  • April 17, 2018, 6:11 p.m.

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Youngdahl, C.K. Approximate solutions for dynamic plastic deformation of a tube, article, January 1, 1989; Illinois. (digital.library.unt.edu/ark:/67531/metadc1099998/: accessed October 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.