This paper presents a novel measurement method that aims to qualitatively and quantitatively assess uniform deformation during displacement- and force-controlled tensile tests of ductile metals. The method utilizes digital image correlation technology to record the strain distribution during tensile testing, followed by the calculation of the floating root mean square (RMS) value of the strain amplitude along the specimen axis. By implementing this approach, the RMS-based profiles of strain amplitude are identified in different metals and alloys, including austenitic stainless steels, structural steel, copper, and aluminium alloys. Moreover, the proposed method holds potential for predicting important deformation characteristics such as distribution of intensive plastic zones, necking effect, and delocalization effect. Thus, it establishes a link between macroscale and microscale during the analysis of plastic deformation behaviour. The effectiveness of the new method is compared with existing strain and strain-rate methods. The novel approach demonstrates promising advantages in the context of the identification of metal-forming parameters.

本文提出了一种新颖的测量方法，旨在定性和定量评估延性金属的位移和力控制拉伸试验期间的均匀变形。该方法利用数字图像相关技术记录拉伸试验过程中的应变分布，然后计算沿试样轴线的应变幅值的浮动均方根（RMS）值。通过实施这种方法，可以识别不同金属和合金（包括奥氏体不锈钢、结构钢、铜和铝合金）中基于 RMS 的应变幅分布。此外，该方法具有预测重要变形特征的潜力，例如密集塑性区的分布、颈缩效应和离域效应。因此，它在塑性变形行为分析过程中建立了宏观尺度和微观尺度之间的联系。将新方法的有效性与现有的应变和应变率方法进行了比较。这种新颖的方法在识别金属成形参数方面展示了有希望的优势。