Akademik Veri Yönetim Sistemi
Proceedings of the 11th International Conference (MMSE 2025), Paris, France, 25–27 July 2025, Paris, Fransa, 25 - 27 Temmuz 2025, cilt.79, ss.296-301, (Tam Metin Bildiri)
Tensile testing remains a cornerstone in the mechanical characterization of metallic materials, offering crucial insights into parameters such as yield strength, ultimate tensile strength, modulus of elasticity, and elongation at fracture. Accurate measurement of strain, particularly in the elastic region, is essential for the reliable calculation of these properties. ISO 6892-1:2019 mandates the use of independent strain measurement devices, such as extensometers, for elongation-related metrics. However, older-generation universal testing machines (UTMs) often lack compatibility with modern extensometry systems, resulting in suboptimal measurement techniques that rely solely on crosshead displacement. This study evaluates the performance of traditional extensometer-free tensile testing against a modern, non-contact video extensometry method, emphasizing compliance with ISO 6892-1:2019 and geometrical specifications defined in DIN 50125. Test specimens of low-carbon steel, prepared per DIN 50125 Form H, were subjected to uniaxial loading using a dual-configuration approach: Configuration A (without extensometer) and Configuration B (with a video extensometer). The displacement between two markers affixed to the specimen was tracked using a high-speed industrial camera with real-time image processing software. Stress-strain curves from both configurations were analyzed, particularly in the elastic and uniform plastic deformation regions. Results reveal significant discrepancies in modulus of elasticity and elongation values when an extensometer is not used, highlighting the limitations of crosshead-based strain evaluation. Video extensometer demonstrated high fidelity in strain measurement, yielding elastic modulus values within 2% of theoretical expectations for low-carbon steel. The findings support the implementation of video extensometer as a viable, cost-effective retrofit solution for legacy testing systems.