HOPKINSON TECHNIQUES FOR DYNAMIC RECOVERY EXPERIMENTS
HOPKINSON TECHNIQUES FOR DYNAMIC RECOVERY EXPERIMENTS
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DOI：
10.1098/rspa.1991.0150
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发表时间：
1991-11-08
期刊：
影响因子：
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通讯作者：
STARRETT, JE
中科院分区：
文献类型：
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作者：
NEMATNASSER, S;ISAACS, JB;STARRETT, JE
引入新技术使经典的分离式霍普金森杆装置适合于动态恢复实验，其中样品可以经受预先指定形状和持续时间的单个脉冲，然后在没有任何额外负载的情况下恢复，用于测试后表征;即，完全控制卸载技术在霍普金森杆实验。对于压缩动态恢复测试，新设计产生一个压缩脉冲，后面跟着一个拉伸脉冲（应力反向），向样品移动。此外，所有随后的脉冲，反射了两个酒吧的自由端（入射和透射）呈现拉伸，使样品受到一个单一的压缩脉冲，其形状和持续时间也可以控制。对于拉伸恢复实验，新设计提供了捕获从样品反射的压缩脉冲和通过样品传输的拉伸脉冲。此外，样品可以经受压缩，然后拉伸，然后恢复，允许研究材料中的动态鲍辛格效应。
Novel techniques are introduced to render the classical split Hopkinson bar apparatus suitable for dynamic recovery experiments, where samples can be subjected to a single pulse of pre-assigned shape and duration, and then recovered without any additional loading, for post-test characterization; i.e., techniques for fully controlled unloading in Hopkinson bar experiments. For compression dynamic recovery tests, the new design generates a compressive pulse trailed by a tensile pulse (stress reversal), travelling toward the sample. Furthermore, all subsequent pulses which reflect off the free ends of the two bars (incident and transmission) are rendered tensile, so that the sample is subjected to a single compressive pulse whose shape and duration can also be controlled. For tension recovery experiments, the new design provides for trapping the compression pulse reflected off the sample, and the tensile pulse transmitted through the sample. In addition, a sample can be subjected to compression followed by tension, and then recovered, allowing the study of, e.g. the dynamic Bauschinger effect in materials.