8结点等参位移模式在数字散斑相关方法上的应用

摘要

在分析国内外数字散斑相关技术的基础上,引入近年来有限元、数字图像、数值分析等方面的技术和方法,提出了根据物体的实际变形假设的新的位移模式,即8结点等参位移模式.针对这一位移模式,首次开发出适合木材变形的数字散斑相关测试软件,并将用8结点等参位移模式的数字散斑相关方法得到的结果与Ansys有限元计算的结果进行比较,结果表明:采用8结点等参位移模式的数字散斑相关方法,在复杂应力、应变场的测试中准确可靠.%A new displacement mode, namely 8-node isoparametric element, was provided on the basis of an assumption of using the real deformation of objects to fit complicated deformation, by introducing the methods of finite element, digital image processing and numerical analysis in recent years, as well as analyzing digital speckle correlation methods at home and a-broad. Effective software related to digital speckle was developed to test deformation in wood. The results of digital speckle correlation method were compared with those of finite element method. Results show that the precision and authenticity of digital speckle correlation method with 8-node isoparametric element is validated in complicated deformation.