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3-D characterization of incipient spallation response in cylindrical copper under sweeping detonation

Published online by Cambridge University Press:  08 March 2017

Yang Yang*
Affiliation:
School of Material Science and Engineering, Central South University, Changsha 410083, China; Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang 621900, China; and Key Laboratory of Nonferrous Metals Material Science and Engineering of Ministry of Education, Central South University, Changsha 410083, China
Chen Jixiong
Affiliation:
School of Material Science and Engineering, Central South University, Changsha 410083, China
Guo Zhaoliang
Affiliation:
Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang 621900, China
Tang Tiegang
Affiliation:
Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang 621900, China
Hu Haibo
Affiliation:
Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang 621900, China
Fu Yanan
Affiliation:
Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
*
a) Address all correspondence to this author. e-mail: yangyanggroup@163.com
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Abstract

The effect of peak shock stress on the incipient spallation damage in a cylindrical sample under sweeping detonation is presented. The free surface velocity curve was measured by photon Doppler velocimetry and the quantitative investigation of voids in a spalled sample was performed using X-ray computer tomography. The results revealed that the maximum volume and the mean volume of voids in the spalled sample increased with increasing shock stress. The sphericity of voids decreases with the increasing of shock stress. The rod voids were the result of the independent growth of voids along the grain boundaries in samples with lower shock stress, while the rod shaped voids in sample with higher shock stress were formed due to coalesce. The rod voids can be found in a cylindrical sample, while the voids in plate samples were in the shape of spheres or ellipsoids, and the difference of stress state induced by the curvature in the geometry of samples may be the main reason.

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Articles
Copyright
Copyright © Materials Research Society 2017 

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Footnotes

Contributing Editor: Jürgen Eckert

References

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