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Title: Explosively driven facture and fragmentation of metal cylinders and rings

Abstract

Cylinders and rings fabricated from AerMet{reg_sign} 100 alloy and AISI 1018 steel have been explosively driven to fragmentation in order to determine the fracture strains for these materials under plane strain and uniaxial stress conditions. The phenomena associated with the dynamic expansion and subsequent break up of the cylinders are monitored with high-speed diagnostics. In addition, complementary experiments are performed in which fragments from the explosively driven cylinder are recovered and analyzed to determine the statistical distribution associated with the fragmentation process as well as to determine failure mechanisms. The data are used to determine relevant coefficients for the Johnson-Cook (Hancock-McKenzie) fracture model. Metallurgical analysis of the fragments provides information on damage and failure mechanisms.

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
920473
Report Number(s):
UCRL-CONF-230236
TRN: US200818%%659
DOE Contract Number:
W-7405-ENG-48
Resource Type:
Conference
Resource Relation:
Conference: Presented at: Hypervelocity Impact Symposium-2007, Williamsburg, VA, United States, Sep 23 - Sep 27, 2007
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUMM MECHANICS, GENERAL PHYSICS; ALLOYS; DISTRIBUTION; FRACTURES; FRAGMENTATION; STEELS; STRAINS

Citation Formats

Goto, D, Becker, R C, Orzechowski, T J, Springer, H K, Sunwoo, A J, and Syn, C K. Explosively driven facture and fragmentation of metal cylinders and rings. United States: N. p., 2007. Web.
Goto, D, Becker, R C, Orzechowski, T J, Springer, H K, Sunwoo, A J, & Syn, C K. Explosively driven facture and fragmentation of metal cylinders and rings. United States.
Goto, D, Becker, R C, Orzechowski, T J, Springer, H K, Sunwoo, A J, and Syn, C K. Wed . "Explosively driven facture and fragmentation of metal cylinders and rings". United States. doi:. https://www.osti.gov/servlets/purl/920473.
@article{osti_920473,
title = {Explosively driven facture and fragmentation of metal cylinders and rings},
author = {Goto, D and Becker, R C and Orzechowski, T J and Springer, H K and Sunwoo, A J and Syn, C K},
abstractNote = {Cylinders and rings fabricated from AerMet{reg_sign} 100 alloy and AISI 1018 steel have been explosively driven to fragmentation in order to determine the fracture strains for these materials under plane strain and uniaxial stress conditions. The phenomena associated with the dynamic expansion and subsequent break up of the cylinders are monitored with high-speed diagnostics. In addition, complementary experiments are performed in which fragments from the explosively driven cylinder are recovered and analyzed to determine the statistical distribution associated with the fragmentation process as well as to determine failure mechanisms. The data are used to determine relevant coefficients for the Johnson-Cook (Hancock-McKenzie) fracture model. Metallurgical analysis of the fragments provides information on damage and failure mechanisms.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Jan 03 00:00:00 EST 2007},
month = {Wed Jan 03 00:00:00 EST 2007}
}

Conference:
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  • Cylinders and rings fabricated from AerMet{reg_sign} 100 alloy and AISI 1018 steel have been explosively driven to fragmentation in order to determine the fracture strains for these materials under plane strain and uniaxial stress conditions. The phenomena associated with the dynamic expansion and subsequent break up of the cylinders are monitored with high-speed diagnostics. In addition, complementary experiments are performed in which fragments from the explosively driven cylinders are recovered and analyzed to determine the statistical distribution associated with the fragmentation process as well as to determine failure mechanisms. The data are used to determine relevant coefficients for the Hancock-McKenziemore » (Johnson-Cook) fracture model. Metallurgical analysis of the fragments provides information on damage and failure mechanisms.« less
  • High explosive enclosed by a metal case qualitatively describes an essential component of high energy systems of importance to the Department of Energy. Detonation of the high explosive causes intense transient pressure loading of the metal following arrival of normal or obliquely incident explosive detonation wave. Subsequent expansion and deformation of the metal case leads to eventual rupture and the opening of fractures and fissures. Details of the rupture process are critical to performance of the system. Consequently, it is essential that the material and kinematic issues governing the processes of dynamic loading and subsequent failure of an explosive-metal casemore » component within a functioning system be adequately understood. Among the reasons are to quantify existing performance, characterize potential degradation of performance resulting from system aging, and optimizing or maintaining system performance through implementation of structural or material changes. The physical and engineering issues underlying this dynamic response and failure phenomena are not adequately understood. The purpose of the present program is to identify the key issues and develop theoretical, computational and experimental models needed to achieve a satisfactory theoretical and analysis framework for analysis of metal case failure in the explosive environment. Specific tasks within the present program include: (1) Models and theories currently being pursued based on physical principles of both the statistical fragmentation concepts of Mott and the energy-based concept of others show promise of providing the analytic and computational methodology capable of predicting explosion-induced fracture and fragmentation of metal components. Experimental studies initiated in the earlier effort offer promise to provide critical test data for validation. The present task shall involve the further refinement and development of the dynamic failure and fragmentation models and theories, and the concomitant application and validation of these models and theories to experimental test data with the focus of providing the analytic methodology sought in the programmatic effort. (2) Stand-alone engineering algorithms and large-scale computer codes will constitute the calculational methodology developed to simulate and analyze the operational system response of metal components in explosive-loading environments. This task will pursue the preparation and implementation of the models and theories of dynamic fragmentation above to the status of engineering and computational analysis tools. The engineering and computer analysis tools pursued will also be tested against experimental fracture and fragmentation data emerging from the program effort.« less
  • The ductile failure of rapidly expanding metal rings is considered with emphasis on the role of inertial forces in the dynamic fragmentation process. Expressions for the fragment size and fracture strain dependence on strain rate are obtained and compared with experiments on aluminum and copper rings. The experimental fragment size distribution is examined in light of theories based on a random fracture process.
  • This paper presents calculations of the {sup 252}Cf-source-driven noise analysis measurements for subcritical highly enriched uranium metal cylinders using the Monte Carlo code MCNP-DSP. This code directly calculates the noise analysis data from the {sup 252}Cf- source-driven noise analysis method for both neutron and gamma ray detectors. Direct calculation of experimental observables by the Monte Carlo method allows for the benchmarking of the calculational model and the cross sections and for determining the bias in the calculation.