Surface deformation testing of aluminum alloy sheet based on DIC

Aluminum alloy sheets inevitably undergo deformation during processing such as rolling and welding. Plate deformation can alter its mechanical properties, reduce product quality, pose safety hazards, and have a significant impact on subsequent applications, processing, and manufacturing. To avoid the impact of board deformation on production and daily life, it is necessary to test the deformation of the board. It is designed to conduct Tensile testing within the elastic deformation range of 6061 aluminum alloy plate through Tensile testing machine to make it deform. A deformation measurement system consisting of an industrial camera, a high-performance computer, and an auxiliary light source was built. The strain distribution of 6061 aluminum alloy sheet was measured by digital image correlation method. The test results indicate that the maximum tensile strain and maximum compressive strain in the horizontal and vertical directions basically occur near the edge of the calculation sub region. The maximum tensile strain in the horizontal direction is 0.038872, and the maximum compressive strain is 0.026501; The maximum tensile strain in the vertical direction is 0.012119, and the maximum compressive strain is 0.0098305. The design adopts the principle of digital image correlation method for sheet deformation testing, which can accurately, quickly, and non-destructive measure the strain size and distribution of the sheet, making up for the limitations of traditional measurement methods and improving measurement efficiency.