应用数字图像相关法测定瓦楞原纸的泊松比

对瓦楞原纸泊松比的测定存在许多困难,传统的接触式方法难以满足测定要求,还没有一种简单高效的方法能解决这个问题。针对传统位移测量方法的不足,提出以数字图像相关法测定瓦楞原纸的泊松比。通过对试样变形前后的图像进行相关性位移分析,将试验所得的实测位移与已标定位移进行对比,所得结果具高度的一致性,相对误差范围为1%～3%。试验测定面纸MD（machine direction）方向和CD（crossmachine direction）方向的泊松比分别为0.175和0.073,芯纸MD方向和CD方向的泊松比分别为0.275和0.119。测试及分析结果表明,应用数字图像相关法测定瓦楞原纸的方法是可行的,具有较佳的应用价值,能为研究纸张的泊松比提供一个新途径。

Use of Digital Image Correlation Method for Poisson's Ratio of Corrugated Paper

There were many difficulties for measuring Poisson＇s ratio of corrugated paper.It was hard to satisfy the determination of requirements with the traditional contract method.A simple and efficient way had not been proposed to solve this problem.For disadvantages of the traditional method to measure displacements,digital image correlation method was proposed to measure Poisson＇s ratio of corrugated paper.The images taken before and after samples deformed were analyzed about related displacements.Composing measured displacements in the experiment with calibration ones led to highly coincident result.The relative error was from 1%~3%.The Poisson＇s ratio of corrugated facing paper in MD and CD were 0.175 and 0.073,respectively.The one of corrugated medium in MD and CD were 0.275 and 0.119,respectively.Test and analytic results showed that DIC was feasible,and had actual using value,and was a new approach to test and investigate Poisson＇s ratio of paper.