Paper Title:
Mechanical Changes in Materials Caused by Explosive Precompression Shock Waves and the Effects on Fragmentation of Exploding Cylinders
  Abstract

Explosive driven rapid fracture in a structural body will be preceded by a compression process, and the compression effects on mechanical properties of the materials are clearly important to understand shock-induced failure such as spall or fragmentation phenomena. In this study, incident shock waves in plate specimens of aluminum A2017-T4 and 304 stainless steel are generated by plane detonation waves in the high explosive PETN initiated using wire-row explosion techniques, and the compressed specimens are successfully recovered without severe damages due to the reflected expansion waves with use of momentum trap method. A hydro code, Autodyn-2D is applied to determine test conditions: thicknesses of explosives, attenuators, specimens and momentum traps and to evaluate experimental results, simulating time-histories of stress waves in the layers of the test assembly. Microhardness distributions in cross-sections, tensile strength, fracture ductility and yield stress are measured for the recovered specimens, using miniature tensile and compression test pieces machined from them. They are compared with those of virgin specimens, showing significant increase of hardness, tensile and yield strength and remarkable reduction of elongation and ductility for shocked specimens. The results are taken into consideration for evaluation of experimental fragmentation energy in cylinder explosion tests.

  Info
Periodical
Edited by
S. Itoh and K. Hokamoto
Pages
237-242
DOI
10.4028/www.scientific.net/MSF.566.237
Citation
T. Hiroe, K. Fujiwara, H. Hata, K. Watanabe, M. Yamamoto, "Mechanical Changes in Materials Caused by Explosive Precompression Shock Waves and the Effects on Fragmentation of Exploding Cylinders", Materials Science Forum, Vol. 566, pp. 237-242, 2008
Online since
November 2007
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Yoichi Kayamori, S. Hillmansen, P.S.J. Crofton, Roderick A. Smith
Abstract:Static and dynamic ductile crack propagation tests were carried out using thin single edge notched tension (SENT) specimens of...
2180
Authors: S. Kamel, Robert C. Wimpory, Michael Hofmann, Kamran M. Nikbin, N.P. O'Dowd
Abstract:This paper considers the prediction of the effects of tensile and compressive residual stress in fracture mechanics specimens by the...
275
Authors: Xiao Bin Song, Hong Yong Tang, Wei Ping Zhang, Xiang Lin Gu
Abstract:This paper presents the results of an experimental study on the compressive stress-strain relationship of wood confined with fiber composite...
1207