The micro-scale deformation measurement method is an important research method for exploring the failure mechanism of packaging materials.In this study,a micro-scale speckle printing method was proposed,and the micro-scale deformation measurement of kraft paper was realized by combining digital image correlation(DIC)technology.Firstly,pure color images with different resolutions and different gray levels were printed on kraft paper as micro-scale speckles,and the average gray gradient was used to evaluate the speckle quality.The results showed that high-quality micro-scale speckles can be prepared on printable packaging paper by printing pure black(gray level is 0)images.Next,combined with an optical microscope and a micro-tensile stage,a translation experiment and a uniaxial tensile experiment were carried out.The results showed that the micro-scale speckle based on printing combined with DIC can achieve micro-scale displacement measurement,and the prepared speckles have no obvious effect on the original mechanical properties of kraft paper.Finally,the micro-scale speckle printing method combined with DIC was applied to analyze the effect of creases on the tensile properties of kraft paper.The local strain concentration in the crease micro-region leads to a significant decrease in the tensile strength of the crease sample.This study provides an effective method for micro-scale deformation measurement of printable packaging materials.
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