Abstract
This paper presents the characterization of Lüders bands by digital image correlation on niobium microalloyed steel during a static tensile testing. Digital image correlation with the qualitative and quantitative analysis of the Lüders bands on the microalloyed steel was proved as a very precise and suitable method for determining the strain amount in the deformation zone. In this research was determined that the strain amount is the highest in the area behind the Lüders band front and the lowest in the area in front of the Lüders band.
Highlights
In metalworking applications, an inhomogeneous plastic deformation, i.e. Lüders bands, can pose a significant problem
The aim of this paper is to demonstrate the feasibility of using Digital Image Correlation (DIC) for the characterization and identification of Lüders bands during the static tensile testing
First of all it is necessary to choose the reference and the deformed images obtained with the digital camera
Summary
An inhomogeneous plastic deformation, i.e. Lüders bands, can pose a significant problem Different materials, such as low carbon steels [1], aluminium alloys [2], transformation induced plasticity (TRIP) steels [3], shape memory alloys [4] and copper [5], can show the appearance of the Lüders bands during plastic deformation. Digital Image Correlation (DIC) is a non-contact, easy to use and cost-effective optical technique for measuring strains and displacements. It is used, amongst others, for the characterization of material properties and the monitoring of components and structures. DIC has a lot of advantages over traditional strain measurements and is an increasingly used tool in the engineering community with a widespread application such as mechanical engineering, material science, material identification, biomedical and biomechanical sciences [10]
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