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Microstructural Effects in the High Strain Rate Ring Fragmentation of Copper

  • Sarah WardEmail author
  • Christopher Braithwaite
  • Andrew Jardine
Conference paper
Part of the Conference Proceedings of the Society for Experimental Mechanics Series book series (CPSEMS)

Abstract

Understanding the failure of rings and shells at high strain rates is a longstanding challenge (Mott, N.F. (1947), Fragmentation of rings and shells, Proc. Royal Soc., A189, 300--308, January.). Predicting the distribution of fragment sizes, shapes and velocities has been an important objective for the many modelling techniques applied to the problem; a detailed history of this research can be found in the work of Grady (Grady, Fragmentation of rings and shells. Springer, Berlin Heidelberg, 2006). Physical testing is particularly important for model development and validation. More recently, ring fragmentation has been used to study the relationship between material microstructure and dynamic fracture.

A series of explosively loaded fragmentation experiments were conducted to investigate microstructural effects in the dynamic tensile behaviour of high purity copper. Rings of high purity copper were expanded at strain rates of approximately 104 s−1. Diagnostics include PDV, high speed photography and soft capture. The fracture mechanism is studied through the detailed analysis of fracture surfaces and fragments using scanning electron microscopy. Microstructural changes induced by the plastic deformation developed during the applied loading are also examined.

Keywords

Copper Ring Fracture Fragmentation Microstructure 

Notes

Acknowledgments

We acknowledge support of this research by EPSRC and AWE. The PDV data analysis was performed using software written by N. Taylor of the SMF group at the Cavendish Laboratory.

© British Crown Owned Copyright 2018/AWE.

References

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    Gourdin, W.H., Lassila, D.H.: The mechanical behavior of pre-shocked copper at strain rates of 10− 3− 10 4 s− 1 and temperatures of 25–400° C. Mater. Sci. Eng. A. 151(1), 11–18 (1992)CrossRefGoogle Scholar
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    Ghahremaninezhad, A., Ravi-Chandar, K.: Ductile failure in polycrystalline OFHC copper. Int. J. Solids Struct. 48(24), 3299–3311 (2011)CrossRefGoogle Scholar

Copyright information

© The Society for Experimental Mechanics, Inc. 2019

Authors and Affiliations

  • Sarah Ward
    • 1
    Email author
  • Christopher Braithwaite
    • 1
  • Andrew Jardine
    • 1
  1. 1.Univeristy of Cambridge, SMF Fracture and Shock Physics Group, Cavendish LaboratoryCambridgeUK

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