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Modification of the Shear-Compression Specimen for Large Strain Testing

机译：修改剪切压缩试样以进行大应变测试

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摘要

A modified shear-compression specimen (SCS), for large strain testing over a wide range of strain rates is presented. The original SCS design includes two rectangular slots that are machined at 45 degrees with respect to the longitudinal axis. The modification consists of creating two diametrically opposed semi-circular slots. The new "circular" specimen is first thoroughly investigated numerically under quasi-static and dynamic loading using an elasto-plastic material model. The results of the comparison between the two-slot designs confirm the feasibility of the new specimen for larger strain testing and indicates its advantages over the rectangular slot design: larger strain range characterization, failure and fracture within the gauge, and constant Lode parameter during plastic deformation. Both types of SCS as well as cylindrical specimens are used to characterize the flow behavior of steel 1020, in the quasi-static and dynamic regimes using a split Hopkinson pressure bar. Dog-bone specimens are also tested quasi-statically in tension. A very good agreement is achieved for the results of all specimens in both the quasi-static and dynamic regimes. The numerical validation procedure shows that the flow stress of 1020 steel obtained with the new SCS is similar to 3 % lower in the quasi-static regime, and 8 % lower in the dynamic regime with respect to the flow stress of the rectangular SCS. This difference is attributed to effect of the third invariant of the stress deviator (i.e., Lode parameter), which is considerably lower in the new SCS design.
机译：提出了一种改进的剪切压缩样本（SCS），用于在较大应变率范围内进行大应变测试。原始的SCS设计包括两个矩形槽，它们相对于纵轴成45度角加工。修改包括创建两个在直径上相对的半圆形槽。首先使用弹塑性材料模型在准静态和动态载荷下对新的“圆形”试样进行了彻底的数值研究。两槽设计之间的比较结果证实了新样品在更大应变测试中的可行性，并表明了其比矩形槽设计更具优势：更大的应变范围表征，量规内的破坏和断裂以及塑性期间的恒定Lode参数形变。两种类型的SCS以及圆柱形试样均用于使用分叉的Hopkinson压力棒在准静态和动态状态下表征钢1020的流动行为。狗骨头标本还经过准静态拉伸测试。在准静态和动态状态下，所有样本的结果都取得了很好的一致性。数值验证程序表明，相对于矩形SCS的流应力，使用新的SCS获得的1020钢的流应力在准静态状态下降低了3％，在动态状态下降低了8％。这种差异归因于应力偏向器的第三不变性（即Lode参数）的影响，在新的SCS设计中，该第三不变性要低得多。

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