In our previous study, a modified Taylor impact test instrumented using a Hopkinson pressure bar and high-speed imaging was proposed to obtain the stress-strain curve at any moment. In this method, only a linear change in the internal force with respect to the axial position in the plasticity-dominant region of the specimens was assumed. Basically, the Taylor impact test measures the impact yield stress through large non-uniform plasticity in deformed specimens and has been widely expanded, such as verifying the models used to express the mechanical behavior. However, there are no crucial methods for obtaining the stress-strain curve although the proposed method is more effective. This is because the method has not been verified experimentally or discussed sufficiently. In this study, the validity of the proposed method and the intrinsic time for obtaining the stress-strain curve are discussed through an experiment and finite element simulation at different impact velocities. The intrinsic time can be selected from the time period of phase 2 after the three phases deformation is confirmed via high-speed imaging. The reliable stress-strain curve in a low strain range at the intrinsic time can be obtained successfully using an actual experiment based on the proposed method without repeating the tests many times.

在我们之前的研究中，提出了一种使用霍普金森压力棒和高速成像仪器进行改进的泰勒冲击试验，以获取任何时刻的应力-应变曲线。在该方法中，仅假设内力相对于试样塑性主导区域中的轴向位置呈线性变化。基本上，泰勒冲击试验通过变形试样中较大的非均匀塑性来测量冲击屈服应力，并已得到广泛扩展，例如验证用于表达力学行为的模型。然而，尽管提出的方法更有效，但没有获得应力应变曲线的关键方法。这是因为该方法尚未经过实验验证或充分讨论。在这项研究中，通过实验和不同冲击速度下的有限元模拟，讨论了该方法的有效性和获得应力-应变曲线的固有时间。本征时间可从高速成像确认三相变形后的第二相时间段中选择。使用基于所提出方法的实际实验可以成功获得固有时间低应变范围内的可靠应力-应变曲线，而无需多次重复测试。