微尺度散斑打印方法及应用  

Microscale Speckle Printing Method and Application

作　　者：张晓川[1] 梁树兵 秦欣怡 闫悦悦 陈刚 张佩佩 ZHANG Xiao-chuan;LIANG Shu-bing;QIN Xin-yi;YAN Yue-yue;CHEN Gang;ZHANG Pei-pei(School of Mechanical Engineering,Tianjin University of Commerce,Tianjin 300134,China)

机构地区：[1]天津商业大学机械工程学院,天津300134

出　　处：《印刷与数字媒体技术研究》2024年第5期219-225,共7页Printing and Digital Media Technology Study

基　　金：天津市自然科学基金重点项目(No.23JCZDJC00220);国家级大学生创新训练计划项目(No.202410069030)。

摘　　要：微尺度变形测量方法是探究包装材料破坏失效机理的重要研究手段。本研究提出了一种微尺度散斑打印方法,并结合数字图像相关(digital image correlation,DIC)技术实现了牛皮纸微尺度变形测量。首先,在牛皮纸上打印不同分辨率、不同灰度级的纯色图像作为微尺度散斑,并采用平均灰度梯度评价散斑质量,结果表明通过打印纯黑(灰度级为0)图像即可在可打印包装纸上制备较高质量微尺度散斑。接下来,结合光学显微镜及微拉伸台,进行了平移实验和单轴拉伸实验,结果表明基于打印的微尺度散斑结合DIC可以实现微米量级的位移测量,制备的散斑对牛皮纸原有力学性能无明显影响。最后,将微尺度散斑打印方法与DIC相结合应用于分析折痕对牛皮纸拉伸性能的影响,折痕微区的局部应变集中导致了折痕试样抗拉强度的明显下降。本研究为可打印包装材料的微尺度变形测量提供了一种有效手段。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.

关 键 词：微尺度 散斑打印 数字图像相关 变形 

分 类 号：O348.1[理学—固体力学] TS07[理学—力学]