Methodology for a Hopkinson test with a non-uniform viscoelastic bar

被引:17
作者
Bacon, C [1 ]
Brun, A [1 ]
机构
[1] Univ Bordeaux 1, Mecan Phys Lab, CNRS, UMR 5469, F-33405 Talence, France
关键词
Hopkinson or Kolsky viscoelastic bar; non-uniform impedance;
D O I
10.1016/S0734-743X(99)00166-9
中图分类号
TH [机械、仪表工业];
学科分类号
0802 ;
摘要
The conventional Hopkinson pressure bar method needs the use of uniform elastic bars with uniform mechanical characteristics and uniform cross-sectional area. In some particular cases, the impedance may be non-uniform in order to match the specimen impedance or if the bar is heated for high-temperature tests for instance. The method presented allows one to take the impedance variation of elastic or viscoelastic bars into account by using a transfer matrix. This transfer matrix can be predicted theoretically if the variations of the mechanical characteristics and of the cross-sectional area are known. If this is not the case, it is shown that the transfer matrix can be evaluated by a direct experimental method. This method is validated by tests performed on a viscoelastic bar having a significant impedance variation. (C) 2000 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:219 / 230
页数:12
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