In-situ full-field measurements became one of the drivers for process understanding, model creation, validation and inverse analysis. Therefore, a novel spatio-temporal optical flow method for the robust measurement of higher-order strain derivatives is proposed. This computer vision approach overcomes inherent restrictions of established DIC methods. For advanced process analysis of shear cutting processes, the deformation curvature (2nd-order displacement derivative) and the respective rate (3rd-order displacement derivative) are of high interest. For the first time, it is possible to quantify experimentally these higher-order derivatives in sufficient quality with the proposed spatio-temporal optical flow approach. In addition, interesting correlations between the microstructure of the material and macroscopic process results are determined. This demonstrates the potential of the novel in-situ measurement approach for the advanced process analysis of metal forming processes in general.

原位全场测量成为过程理解、模型创建、验证和逆向分析的驱动因素之一。因此，提出了一种新的时空光流方法，用于高阶应变导数的鲁棒测量。这种计算机视觉方法克服了已建立的 DIC 方法的固有限制。对于剪切切削过程的高级过程分析，变形曲率（二阶位移导数）和相应的速率（三阶位移导数）是非常重要的。第一次，可以使用所提出的时空光流方法以足够的质量通过实验量化这些高阶导数。此外，还确定了材料的微观结构与宏观过程结果之间有趣的相关性。