A double notched central hole, i.e., DNC specimen, which contains a center hole with a left side notch and a right side notch accompanying the slope α, is proposed to simultaneously achieve dual values of stress triaxiality and Lode parameter from one specimen in the present study. Analytical and numerical approaches are carried out under decent assumptions to characterize the plane strain behavior of DNC specimen along with the slope α. Quasi-static tensile tests with conventional specimens and DNC specimens revealed plastic strains at fracture for each specimen case in accordance with stress triaxiality and Lode parameter by digital image correlation. It is found that one DNC specimen successfully provides dual values of stress triaxiality and Lode parameter at the same time; therefore, it saves up to 50 % of experimental time and labor of conventional specimens.

提出了一种双缺口中心孔，即 DNC 试样，它包含一个中心孔，带有一个左侧缺口和一个与斜率α相伴的右侧缺口，以在目前的一个试样上同时获得应力三轴度和 Lode 参数的双重值。学习。分析和数值方法在适当的假设下进行，以表征 DNC 试样的平面应变行为以及斜率α. 常规试样和 DNC 试样的准静态拉伸试验根据应力三轴性和通过数字图像相关的 Lode 参数揭示了每个试样情况下的断裂塑性应变。发现1个DNC试件成功同时提供了应力三轴度和Lode参数的双重值；因此，它可以节省多达 50% 的传统标本的实验时间和劳动力。