Despite tensile testing being commonly used for investigating the mechanical behavior of materials, the occurrence of heterogeneous strain and increasing temperature at high strain rates make the experiment much more complex. This work presents a method integrating synchronous full-field stereo Digital Image Correlation (DIC) and Infrared Thermography (IRT). This method enabled high resolution investigations of the development of local temperatures and strains of the specimen during tensile loading of four steels at strain rates ranging from 2.5·10⁻⁴ to 900 s⁻¹. The tests were monitored by a stereo setup of optical cameras and an infrared camera. Data acquisition was synchronized, and a pinhole camera model was used to translate the images from all cameras to the same three-dimensional space. The displacement vector fields from DIC were subtracted from the IRT images to represent the temperature maps in a Lagrangian coordinate system. The overall thermomechanical response of the materials was shown as 3D waterfall plots, which represent localized strain and temperature as a function of position and engineering strain. The results show that temperature increased homogeneously during uniform deformation at higher strain rates (10⁻²-900 s⁻¹) and increased markedly with the onset of necking on the region of localized strain. At these strain rates, the localized increase of strain and temperature during necking were observed at the same global engineering strain and position, evidencing the spatial and temporal synchronization. The described method was used to accurately investigate the evolution of localized strain and temperature in both low and high strain rate regime.

尽管通常使用拉伸试验来研究材料的机械性能，但在高应变速率下异质应变的出现和温度的升高使实验更加复杂。这项工作提出了一种方法，该方法集成了同步全场立体声数字图像相关（DIC）和红外热成像（IRT）。这种方法可以高分辨率研究四种钢在2.5·10 ^-4到900 s ^-1的应变速率下的拉伸载荷过程中的局部温度和应变的发展。。通过光学摄像头和红外摄像头的立体声设置监视测试。同步数据采集，并使用针孔摄像机模型将所有摄像机的图像转换到相同的三维空间。从IRT图像中减去DIC的位移矢量场，以表示拉格朗日坐标系中的温度图。材料的整体热机械响应显示为3D瀑布图，该图表示局部应变和温度与位置和工程应变的关系。结果表明，在较高的应变率（10 ^-2 -900 s ^-1）下，均匀变形过程中温度均匀升高。），并且在局部应变区域随着颈缩的开始而显着增加。在这些应变速率下，在相同的全局工程应变和位置处观察到颈缩过程中应变和温度的局部增加，证明了空间和时间上的同步。所描述的方法用于精确研究低应变率和高应变率条件下局部应变和温度的变化。