Multiaxial dynamic loadings occur in many industrial cases and multiaxial dynamic test development is thus a crucial issue. To meet this challenge, a biaxial compression Hopkinson bar set-up is designed. The set-up consists of a striker, an input bar, an internal output bar and a co-axial external output tube (surrounding the internal bar). The internal output bar measures the axial loading of the cross sample whereas the external output bar measures the transverse one via a mechanism. This mechanism uses two intermediate parts with inclined sliding surfaces. Gauges on the bars enable for force measurements in the set-up, and the sample displacement field is obtained by digital image correlation. Simple compression tests on cuboid samples inserted between the input bar and the internal output bar give the sample material behavior. Then, to determine the friction at the mechanism sliding surfaces, identical samples are inserted between the input bar and the external output bar, and are compressed. Finally, the consistency of the measurements obtained during a biaxial compression test on a cross sample can be checked from the previously measured parameters and from numerical simulations.

中文翻译：

---

双轴压缩霍普金森杆装置的探索性试验

多轴动态载荷发生在许多工业案例中，因此多轴动态测试开发是一个关键问题。为了应对这一挑战，设计了双轴压缩霍普金森杆装置。该装置由撞针、输入杆、内部输出杆和同轴外部输出管（围绕内部杆）组成。内部输出杆测量横向样品的轴向载荷，而外部输出杆通过一种机制测量横向载荷。该机构使用两个带有倾斜滑动面的中间部件。杆上的仪表可以在设置中进行力测量，样本位移场是通过数字图像相关性获得的。对插入在输入杆和内部输出杆之间的长方体样品进行简单的压缩测试给出了样品材料的行为。然后，为了确定机构滑动表面的摩擦力，将相同的样品插入输入杆和外部输出杆之间，并进行压缩。最后，可以从先前测量的参数和数值模拟中检查在对交叉样品进行双轴压缩试验期间获得的测量结果的一致性。