Limiting the influence of friction on the split Hopkinson pressure bar tests by using a ring specimen
Limiting the influence of friction on the split Hopkinson pressure bar tests by using a ring specimen
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DOI：
10.1016/j.ijimpeng.2012.04.005
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发表时间：
2012-11-01
影响因子：
5.1
通讯作者：
Calle, M. A. G.
中科院分区：
文献类型：
--
作者：
Alves, M.;Karagiozova, D.;Calle, M. A. G.
轴向压缩下的环的变形进行了分析，以估计一个有利的环试样的几何形状能够限制摩擦的影响，从SHPB试验获得的应力-应变曲线。分析表明，与传统的圆盘试样相比，采用内径大、径向厚度小的环形试样具有一定的优越性。特别是，它可以提高韧性材料在摩擦存在下的测试结果的可靠性。通过对韧性圆环压缩变形的分析，提出了一个修正系数，将实际材料的应力应变曲线与SHPB的阅读联系起来。它示出了使用有限元模拟，建议的校正可以用于广泛的常规韧性材料。钢合金的实验结果表明，修正程序是一种有效的技术，为准确测量的动态材料强度响应。(C)2012爱思唯尔有限公司保留所有权利。
The deformation of a ring under axial compression is analyzed in order to estimate a favorable ring specimen geometry capable of limiting the influence of friction on the stress-strain curve obtained from SHPB tests. The analysis shows that the use of a ring specimen with a large inner diameter and a small radial thickness offers some advantages comparing with the traditional disk sample. In particular, it can improve the reliability of the test results for ductile materials in the presence of friction. Based on the deformation analysis of a ductile ring under compression, a correction coefficient is proposed to relate the actual material stress strain curve with the reading from the SHPB. It is shown using finite element simulation that the proposed correction can be used for a wide range of conventional ductile materials. Experimental results with steel alloys indicate that the correction procedure is an effective technique for an accurate measurement of the dynamic material strength response. (C) 2012 Elsevier Ltd. All rights reserved.