Experimental and 3D Visualisation-Based Analysis of Tensile Behaviour of DC01 Steel Under Variable Testing Speeds

This study presents a visualization-driven approach for analysing the tensile behaviour of DC01 sheet steel under varying testing speeds. Tensile tests were conducted at crosshead speeds of 2, 5, and 10 mm/min, and the corresponding stress–strain responses were used to determine key mechanical properties, including ultimate tensile strength and elongation. Particular emphasis is placed on the application of three-dimensional (3D) surface visualization, which enables simultaneous analysis of the interaction between testing speed and elongation. The developed surface provides enhanced insight into strain-rate sensitivity and reveals interaction effects that cannot be clearly identified using conventional two-dimensional analysis. The results demonstrate a gradual increase in tensile strength with increasing testing speed, accompanied by a slight reduction in elongation, indicating moderate strain-rate strengthening behaviour. In addition to visualization, a regression-based modelling approach was applied as a complementary tool for quantitative approximation of the observed trends. The findings highlight the importance of multi-parameter visualization for improved interpretation of tensile behaviour and provide a useful framework for material characterization and engineering applications involving variable deformation rates.