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A Study on the Effects of Specimen Geometry on Measurement Accuracy of Dynamic Constitutive Properties of Metals Using SHTB
International Journal of Precision Engineering and Manufacturing ( IF 1.9 ) Pub Date : 2020-06-29 , DOI: 10.1007/s12541-020-00368-y
Khac-Ha Nguyen , Chang-Whan Lee , Hyunho Shin , Joo Hyoung Lee , Jong-Bong Kim

Determination of dynamic tensile response of materials has been a challenge because of experimental difficulty. The split Hopkinson tensile bar (SHTB) is one of the most widely used devices for characterization of various materials under dynamic-tensile loading conditions. Since one-dimensional wave propagation in bars is disturbed by specimens and grips, however, SHTB measurement accuracy may not be guaranteed. This means that the stress–strain curve of the specimen that is calculated using strains at bars may not indicate the real stress–strain relation of the specimen. In this study, simulations for the SHTB test were carried out to investigate the effects of thread pitch, specimen length, specimen diameter, and thread inner diameter of the specimen on the measurement accuracy for two types of metals with medium and high yield strengths. Finally, specimen shapes are recommended for accurate measurement of the stress–strain relation of tantalum and tungsten carbide.



中文翻译:

SHTB对试样几何形状对金属动态本构特性测量精度影响的研究

由于实验困难,确定材料的动态拉伸响应一直是一个挑战。剖分式霍普金森拉伸杆(SHTB)是在动态拉伸载荷条件下表征各种材料的最广泛使用的设备之一。但是,由于样品中的一维波传播受到试样和夹具的干扰,因此可能无法保证SHTB的测量精度。这意味着使用条形应变计算出的样品应力-应变曲线可能无法指示样品的真实应力-应变关系。在这项研究中,对SHTB测试进行了模拟,以研究螺距,试样长度,试样直径和试样的螺纹内径对两种类型的中等和高屈服强度金属的测量精度的影响。

更新日期:2020-06-29
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