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Research on Digital Image Correlation Method Applied in Shear Test of New Style Automotive Structural Adhesive

In this paper, digital image correlation method (DICM) is employed to measure the shear behavior of the spot welding specimens and the ones using adhesive under quasi-static lap shear testing. The images of the specimens' surfaces are captured in real-time by CCD and corresponding computer system. DICM is subsequently used to obtained strain by correlating the images captured before and after deformation. Then, both force-displacement curves and stress-strain curves of the specimens including the cracking load are obtained. The results and analysis show that the mechanical properties of specimens using adhesive compared with the spot welding specimens have an obvious advantage. This paper provides some experimental basis for improving this new type of structural adhesive. In this experiment, the method of non-contact measurement was used to obtain the strain. It has greater significance.