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Equating Severity in Qualification Testing

  • M. Prisbrey
  • J. Senecal
  • M. Sethi
  • C. Haynes
  • S. Taylor
Conference paper
Part of the Conference Proceedings of the Society for Experimental Mechanics Series book series (CPSEMS)

Abstract

Understanding how damage progresses in engineering materials is of the utmost importance for ensuring safety and reliability. Mechanical components and structures must often perform safely and reliably for much longer than can be reasonably tested, or the components must operate in severe environments that are difficult to reproduce. The capability to perform real-time, real-scenario testing is not always present or attainable however, and failure to adequately test components can lead to catastrophic consequences or high preventative-maintenance costs resulting from the use of weaker presumptive models. As a solution, a criterion for ductile metals for equating high-stress single shock damage, to periodic, low-stress, multiple shock damage is presented. The correspondence in damage, exhibited as an equivalency in deformation, is derived and experimentally validated. To accomplish this process, we relate the plastic deformation a test coupon experiences under a shock input, to the shock parameters under both single shock and multiple shock regimes. We then compare the proposed theoretical damage model against the experimental data.

Keywords

Qualification Testing Severity Shock Damage 

Notes

Acknowledgments

This work is approved for public release and distribution is unlimited under LA-UR-16-28258. This project was funded through the Los Alamos Dynamics Summer School program of the Los Alamos National Laboratory under the direction of Charles Farrar.

References

  1. 1.
    Fatemi, A., Yang, L.: Cumulative fatigue damage and life prediction theories: a survey of the state of the art for homogeneous materials. Int. J. Fatigue. 20(1), 9–34 (1998)CrossRefGoogle Scholar
  2. 2.
    Miner, M.A.: Cumulative damage in fatigue. J. Appl. Mech. 67, AI59–AI64 (1945)Google Scholar

Copyright information

© The Society for Experimental Mechanics, Inc. 2017

Authors and Affiliations

  • M. Prisbrey
    • 1
  • J. Senecal
    • 2
  • M. Sethi
    • 3
  • C. Haynes
    • 4
  • S. Taylor
    • 4
  1. 1.Department of Mechanical EngineeringUniversity of UtahSalt Lake CityUSA
  2. 2.Department of Mechanical EngineeringMontana State UniversityBozemanUSA
  3. 3.Department of Mechanical EngineeringOlin College of EngineeringNeedhamUSA
  4. 4.Los Alamos National LaboratoryLos AlamosUSA

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