Accurate descriptions of workpiece behaviors are indispensable for achieving reliable simulations of the cutting process. However, the material plastic constitutive models obtained through conventional material tests do not apply in the ranges of strain and strain rate encountered in the realistic machining processes. To address this issue, in this study, we attempt to develop a methodology to understand and identify the plastic deformation behaviors based on high-speed filming and induction preheating during the cutting tests. Different levels of strain, strain rate, and temperature are realized by varying the rake angle, cutting velocity, and initial workpiece temperature, respectively. The plastic deformation and temperature rise in the primary shear zone are characterized by the fine-scale digital image correlation technique and heat convection–conduction equation, respectively, thus rendering the machining test into a high-dynamic-material testing method. The material exhibits strain softening in the primary shear zone and a reduced thermal softening effect under rapid heating conditions. These initial findings can deepen the understanding of material behaviors during the cutting process and can be further developed for implementation in numerical machining models.

准确描述工件行为对于实现可靠的切削过程模拟是必不可少的。但是，通过常规材料测试获得的材料塑性本构模型不适用于实际机加工过程中遇到的应变和应变率范围。为了解决这个问题，在本研究中，我们尝试开发一种方法，以在切削测试过程中基于高速成膜和感应预热来理解和识别塑性变形行为。通过分别改变前角，切削速度和初始工件温度，可以实现不同程度的应变，应变率和温度。精细剪切数字图像相关技术和热对流传导方程分别表征了主剪切区的塑性变形和温升，从而使机加工测试成为一种高动态材料测试方法。该材料在主要剪切区表现出应变软化，并且在快速加热条件下显示出降低的热软化效果。这些初步发现可以加深对切削过程中材料行为的理解，并可以进一步开发以在数值加工模型中实施。